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Olevia_LT37HVS_[SM]


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      DigiMedia




                    Service Manual
                  LCD TV For LT37HVS
                                  Doc. No.
                                  Version1.0
                                  Total Pages39




                                    Approvals
                  Job Function                    Signature   Date
CPO

Project Manager

R&D Dept. Manager

EE Dept. Manager

ME Dept. Manager

Engineering Dept. Manager

Sales Dept. Manager

Quality Assurance Dept. Manager

Author
                                                                    Doc No.
                       Service Manual
    TITLE                                                           Version                       1.0
                     LCD TV For LT37HVS                              Page                        2/39


                                           Table of Contents

1     Introduction................................................................... P3
1.1 Preface......................................................................................... P3

1.2 Caution......................................................................................... P3

1.3 Warning....................................................................................... P3

2     System Block Diagram..................................................... P4
2.1 System Block Diagram..................................................................... P4

2.2 Connector Connection Diagram.......................................................... P5

2.3 Connector Pin Definition.................................................................. P6

3     Troubleshooting............................................................. P26
3.1 No Power.......................................................................................P26

3.2 No Sound.......................................................................................P27

3.3 No Source Input.............................................................................. P28

3.4 Keypad Failed.................................................................................P29

3.5 IR Failed....................................................................................... P30

3.6 Indicator LED Failed........................................................................P31

4     Firmware upgrade applications.......................................... P32
5     Disaggregate Graphic....................................................... P34
5.1 TV Box..........................................................................................P34

5.2 Stand Module................................................................................. P34

5.3 Back Cover.................................................................................... P35

5.4 System Board................................................................................ P36

5.5Indicator Board Module..................................................................... P36

5.6 Keypad Board.................................................................................. P37

5.7 Speaker......................................................................................... P37

5.8 Power Module................................................................................. P38




                                                                                      DigiMedia
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                    Service Manual
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1. Introduction
1.1 Preface
This service manual aims directly at the module of LCD TV. It offers the simple repair which
emphasizes on technique explanation and production troubles to remove for the engineers and
technicians who have electronic background.

1.2 Caution
   Be sure to read those manual before servicing. To assure safety from fire, electric shock, injury,
   harmful radiation and materials, various measures are provided in this Digimedia LCD TV. Be
   sure to read cautionary items described in the manual to maintain safety before servicing.

1.3 Warning
    1. Remember to unplug the AC cord from the AC outlet before cleaning the product. And do
       not use liquid cleaners or aerosol cleaners to clean the display.
    2. Do not place the product on an unstable place. It can cause the product to fall, resulting in
       serious personal injuries as well as damage to the product.
    3. In case the product needs replacement parts, make sure that the service person uses
       replacement parts specified by the manufacturer, or those with the same characteristics and
       performance as the original parts. Use of unauthorized parts can result in fire, electric shock
       and/or other danger.
    4. Do not overload AC outlets or extension cords. It can cause fire or electric shock.
    5. The AC cords must be routed properly to prevent people from stepping on them or objects
       from resting on them. Check the cords at the plugs and product.
    6. Do not hit the panel. Be careful to prevent from getting hurt by broken glass pieces in case
       the panel breaks.
    7. Keep the product away from heat sources such as radiators, heaters, stoves and other
       heat-generating products.
    8. Do not place the display near water. Like bathtub, washbasin, kitchen sink and laundry tub,
       swimming pool and in a wet basement.




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2. System Block Diagram
2.1 System block diagram




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2.2 Connector Connection Diagram




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2.3 Connector Pin Definition
SYSTEM BOARD
Function: VGA Signal In port
Connector type :D-Sub
Specification: CNNT-HD D Sub-H-F-3Row-15pin-Dip-BLU
                                             Pin Definition
  Pin No.       Pin Name           I/O                              Description
     1            VGAR               I                    75 ohm termination, 0.7Vp-p red sig
      2           VGAG              I                     75 ohm termination, 0.7Vp-p green s
      3           VGAB              I                     75 ohm termination, 0.7Vp-p blue si
      4            GND              -                                      GND -
      5             NC              -                                 No connection
      6            GND              -                                      GND
      7            GND              -                                      GND
      8            GND              -                                      GND
      9          VGA5V              I                                  VCC 5V IN
     10            GND              -                                      GND
     11            GND              -                                        -
     12         VGASDA             I/O                     I2C data bus for Reading DDC dat
     13          VGA_HS             I                               Horizontal Sync.
     14          VGA_VS             I                                 Vertical Sync.
     15          VGASCL             I                      I2C clock bus for Reading DDC da


Function: DVI/HDMI signal port
Connector type :HDMI
Specification: HDMI/CRE-HM-19F4-01 CNNT HDMI Cnnt Right Angle M 2Row 19pin SMD
                                             Pin Definition
  Pin No.       Pin Name           I/O                              Description
     1            RX2p               I                          TMDS LVDS input signal
      2            GND               I                                     GND
      3           RX2m               I                          TMDS LVDS input signal
      4            RX1p              I                          TMDS LVDS input signal
      5            GND               -                                     GND
      6           RX1m               I                          TMDS LVDS input signal
      7            RX0p              I                          TMDS LVDS input signal
      8            GND               -                                     GND



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     9          RX0m         I                     TMDS LVDS input signal
     10         RXCp         I                     TMDS LVDS input signal
     11          GND         -                                 GND
     12         RXCm         I                     TMDS LVDS input signal
     13           NC         -                           No connection
     14           NC                                     No connection
     15       DDC_CLK       I/O               I2C clock bus for Reading DDC data
     16      DDC_DATA       I/O                I2C data bus for Reading DDC data
     17          GND                               TMDS LVDS input signal
     18        GDC5V         I                                 VCC5
     19          HPD         I                        HOT PLUG DETECT


Function: PC Audio In
Connector type: RCA
Specification: CNNT-RCA white / red -F DIP RIGHT ANGLE 8.3-4PIN
                                    Pin Definition
  Pin No.     Pin Name     I/O                            Description
     1          GND          -                               GND
     2         AUD_R         I                            Audio In_R
     3           GND         -                                 GND
     4         AUD_L         I                            Audio In_L


Function: RS-232 port
Connector type: Mini Din
Specification: CNNT-Mini Din-H-F-8pin-12-Dip
                                    Pin Definition
  Pin No.     Pin Name      I/O                          Description
     1           NC           -                          No connection
     2         FlsahDL#      I                        Cable Plug In Detect
     3           GND         -                                 GND
     4            NC         -                           No connection
     5            NC         -                           No connection
     6        P_DGNS#        -                    Download Function Control
     7         PC_TXD       O                        RS-232 Data Transmit
     8         PC_RXD        I                        RS-232 Data Receive
     9           GND         -                                 GND


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     10         GND          -                                    GND
     11         GND          -                                    GND


Function: Keypad In
Connector type:M15-I20001
Specification: CNNT M 15PIN pitch 2.0mm DIP Straight WST(blue)
                                       Pin Definition
  Pin No.     Pin Name      I/O                              Description
     1           NC           -                                  NC
     2         LED_B1       O                           Signal for Indicator LED
     3         LED_B1       O                           Signal for Indicator LED
     4         LED_B1       O                           Signal for Indicator LED
     5          GND          -                                    GND
     6           IRD         I                                IR Data In
     7          GND          -                                    GND
     8        KEY_Y3         I                  Signal sent from Keypad to System 3
     9        KEY_Y2         I                  Signal sent from Keypad to System 2
     10       KEY_Y1         I                  Signal sent from Keypad to System 1
     11       KEY_X3        O                   Signal sent from System to Keypad 3
     12       KEY_X2        O                   Signal sent from System to Keypad 2
     13       KEY_X1        O                   Signal sent from System to Keypad 1
     14         GND          -                                    GND
     15         V5_IR       O                              5V POWER Out


Function: TUNER IN /AV IN
Connector type: BOARD TO BOARD
Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board)
                                       Pin Definition
  Pin No.      Pin Name          I/O                         Description
     1         CHKTNR1             I                      CHECK AV Board In
     2        V5_TUNER           O                          POWER OUT_5V
     3        V5_TUNER           O                          POWER OUT_5V
     4           GND              -                               GND
     5           GND              -                               GND
     6            NC              -                           No connection
     7            NC              -                           No connection


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  8         NC         -             No connection
  9         NC         -             No connection
  10       GND         -                    GND
  11      HD_PR        I                  HD_PR In
  12      HD_PB        I                  HD_PB In
  13      HD_Y         I                  HD_Y In
  14     SV_SEL1       O             S_Video_SEL
  15       GND         -                    GND
  16     ALO_SC2       O         Scart2 AUDIO_L CH out
  17     ARO_SC2       O         Scart2 AUDIO_R CH out
  18     ALO_SC1       O         Scart1 AUDIO_L CH out
  19     ARO_SC1       O         Scart1 AUDIO_R CH out
  20       GND         -                    GND
  21     YCBCR_L       O        YCBCR AUDIO_L CH out
  22     YCBCR_R       O        YCBCR AUDIO_R CH out
  23     HDTV_L        O        HDTV_L AUDIO_L CH out
  24     HDTV_R        O        HDTV_L AUDIO_R CH out
  25       GND         -                    GND
  26      SIF1_IN      I            SIF format _IN1
  27      SIF2_IN      I            SIF format _IN2
  28       GND         -                    GND
  29    IF_TU2CVBS     I            Tuner2 CVBS IN
  30    IF_TU1CVBS     I            Tuner1 CVBS IN
  31       GND         -                    GND
  32     V12_SYS2      O                  +12V OUT
  33        NC         -             No connection
  34        NC         -             No connection
  35     V12_SYS2      O                  +12V OUT
  36    PC2DTV_TX      I           PC TO DTV_TX IN
  37    PC2DTV_RX      I           PC TO DTV_RX IN
  38    S2DTV_TX       I          SYS TO DTV_TX IN
  39    S2DTV_RX       I          SYS TO DTV_RX IN
  40     RESETn        I                   RESET
  41       GND         -                    GND
  42    CVBS_SC1       I                  CVBS1 IN
  43    IF_YCVBS       I            S-VIDEO1_Y In



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  44       IF_C        I               S-VIDEO1_C In
  45       GND         -                       GND
  46    OCVBS_SC2      O                Scart2 cvbs out
  47      IF_CR        I                YCBCR_CR IN
  48      IF_CB        I                YCBCR_CB IN
  49       IF_Y        I                YCBCR_Y IN
  50       GND         -                       GND
  51     DTV_PR        I                     DTV_ Pr In
  52     DTV_PB        I                 DTV_ Pb In
  53      DTV_Y        I                     DTV_ Y In
  54    TPA_MODE       I        CHECK EARPHONE CONNECT In
  55     EPOUT_L       O         Audio EARPHONE L CH OUT
  56     EPOUT_R       O         Audio EARPHONE R CH OUT
  57     AMP_WF        O            Audio Sub woofer OUT
  58      LINE_L       O             Audio Line L CH out
  59      LINE_R       O             Audio Line R CH out
  60       GND         -                       GND
  61     SAL_SC2       I           Audio CVBS2/SV2 L ch in
  62     SAR_SC2       I           Audio CVBS2/SV2 R ch in
  63    CVBSAL_SC1     I           Audio CVBS1/SV1 L ch in
  64    CVBSAR_SC1     I           Audio CVBS1/SV1 R ch in
  65       GND         -                       GND
  66       SCL         O               Software I2C Clk
  67       SDA        I/O              Software I2C data
  68      HWSDA       I/O              hardwae I2C data
  69      HWSCL        O               hardwae I2C clk
  70       GND         -                       GND
  71     CVBS_SC2      I                     CVBS2 IN
  72    IF_YCVBS2      I               S-VIDEO2_Y In
  73      IF_C2        I               S-VIDEO2_C In
  74      ADC2         I                     A/D conver
  75      DTV_L        I              Audio DTV L ch in
  76      DTV_R        I              Audio DTV R ch in
  77      ADC1         I                     A/D conver
  78    DTV_SPDIF      I              DTV audio format
  79      ADC0         I                     A/D conver



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    80          DTV_IR        I                           DTV_IR pin


Function: LVDS output port
Connector type: TD01-30R1
Specification: CNNT-LVDS-F SMD STRAIGHT-V-30 PIN-1.25mm
                                   Pin Definition
  Pin No.      Pin Name      I/O                         Description
     1            NC           -                         No connection
     2           GND          -                               GND
     3            NC          -                          No connection
     4            NC          -                          No connection
     5            NC          -                          No connection
     6           GND          -                               GND
     7           GND          -                               GND
     8           GND          -                               GND
     9          TXE3P        O            Positive LVDS differential data output Ch 3
    10          TXE3N        O            Negative LVDS differential data output Ch 3
    11         TXECKP        O              Positive LVDS differential clock output
    12         TXECKN        O              Negative LVDS differential clock output
    13           GND          -                               GND
    14           GND          -                               GND
    15          TXE2P        O            Positive LVDS differential data output. Ch 2
    16          TXE2N        O            Negative LVDS differential data output. Ch 2
    17          TXE1P        O            Positive LVDS differential data output. Ch 1
    18          TXE1N        O            Negative LVDS differential data output. Ch 1
    19          TXE0P        O            Positive LVDS differential data output. Ch 0
    20          TXE0N        O            Negative LVDS differential data output. Ch 0
    21           GND          -                               GND
    22           GND          -                               GND
    23           GND          -                               GND
    24           GND          -                               GND
    25           GND          -                               GND
    26            VCC         -                        +5.0V power supply
    27            VCC         -                        +5.0V power supply
    28            VCC         -                        +5.0V power supply
    29            VCC         -                        +5.0V power supply



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    30            VCC           -                         +5.0V power supply


Function: Power Input 1
Connector type:M15-I25002
Specification: CNNT M 15PIN pitch 2.5mm DIP straight
                                     Pin Definition
  Pin No.      Pin Name        I/O                          Description
     1         +V5_SYS           I                         DC Power 5V IN
     2            +V5           I                          DC Power 5V IN
     3            +V5           I                          DC Power 5V IN
     4            +V5           I                          DC Power 5V IN
     5            +V5           I                          DC Power 5V IN
     6            GND           -                                GND
     7            GND           -                                GND
     8            GND           -                                GND
     9            GND           -                                GND
    10            +V5           I                          DC Power 5V IN
    11            GND           -                                GND
    12        LCD_INVON        O                            Inverter On/Off
    13          PWSTBY         O                       Standby Mode Power 5V
    14            BRI          O                   Backlight Brightness Control
    15            GND           -                                GND


Function: Power Input 2
Connector type:M11-I25002
Specification: CNNT M 11PIN pitch 2.5mm DIP straight
                                     Pin Definition
  Pin No.      Pin Name        I/O                          Description
     1           +V12            I                        DC Power 12V IN
     2            +V12          I                         DC Power 12V IN
     3            +V12          I                         DC Power 12V IN
     4            GND           -                                GND
     5            GND           -                                GND
     6            GND           -                                GND
     7            +12V          I                         DC Power 12V IN
     8            GND           -                                GND


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     9            +12V             I                        DC Power 12V IN
    10            GND              -                               GND
    11            GND              -                               GND


Function: Audio Out (R Channel)
Connector type:M3-I25002
Specification: CNNT M 3PIN pitch 2.5mm DIP straight (red)
                                        Pin Definition
  Pin No.      Pin Name           I/O                         Description
     1         R_OUTN              O                      Negative Audio Out_R
     2             NC              -                          No connection
     3          R_OUTP            O                       Positive 0Audio Out_R


Function: Audio Out (L Channel)
Connector type: M3-I25002
Pecification : CNNT M 3PIN pitch 2.5mm DIP straight (white)
                                        Pin Definition
  Pin No.      Pin Name           I/O                         Description
     1         L_OUTN              O                      Negative Audio Out_L
     2             NC              -                          No connection
     3          L_OUTP            O                       Positive 0Audio Out_L


AV BOARD
Function: TUNER OUT / AV OUT
Connector type: BOARD TO BOARD
Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board)


                                        Pin Definition
  Pin No.      Pin Name           I/O                         Description
     1         CHKTNR1             O                       CHECK AV Board In
     2        V5_TUNER             I                          POWER IN_5V
     3        V5_TUNER             I                          POWER IN_5V
     4            GND              -                               GND
     5            GND              -                               GND
     6             NC              -                          No connection
     7             NC              -                          No connection


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  8        NC         -             No connection
  9        NC         -             No connection
  10       GND        -                   GND
  11      HD_PR       O              HD_PR OUT
  12      HD_PB       O              HD_PB OUT
  13      HD_Y        O              HD_Y OUT
  14     SV_SEL1      I             S_Video_SEL
  15       GND        -                   GND
  16     ALO_SC2      I         Scart2 AUDIO_L CH IN
  17     ARO_SC2      I         Scart2 AUDIO_R CH IN
  18     ALO_SC1      I         Scart1 AUDIO_L CH IN
  19     ARO_SC1      I         Scart1 AUDIO_R CH IN
  20       GND        -                   GND
  21     YCBCR_L      I        YCBCR AUDIO_L CH IN
  22     YCBCR_R      I        YCBCR AUDIO_R CH IN
  23     HDTV_L       I        HDTV_L AUDIO_L CH IN
  24     HDTV_R       I        HDTV_L AUDIO_R CH IN
  25       GND        -                   GND
  26     SIF1_OUT     O           SIF format _OUT1
  27     SIF2_OUT     O           SIF format _OUT2
  28       GND        -                   GND
  29    IF_TU2CVBS    O           Tuner2 CVBS OUT
  30    IF_TU1CVBS    O           Tuner1 CVBS OUT
  31       GND        -                   GND
  32     V12_SYS2     I                  +12V IN
  33       NC         -             No connection
  34       NC         -             No connection
  35     V12_SYS2     I                  +12V IN
  36    PC2DTV_TX     O         PC TO DTV_TX OUT
  37    PC2DTV_RX     O         PC TO DTV_RX OUT
  38    S2DTV_TX      O         SYS TO DTV_TX OUT
  39    S2DTV_RX      O         SYS TO DTV_RX OUT
  40     RESETn       O                  RESET
  41       GND        -                   GND
  42    CVBS_SC1      O              CVBS1 OUT
  43    IF_YCVBS      O           S-VIDEO1_Y OUT



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  44       IF_C        O               S-VIDEO1_C OUT
  45       GND         -                        GND
  46    OCVBS_SC2      I                 Scart2 cvbs IN
  47      IF_CR        O               YCBCR_CR OUT
  48      IF_CB        O               YCBCR_CB OUT
  49       IF_Y        O                YCBCR_Y OUT
  50       GND         -                        GND
  51     DTV_PR        O                 DTV_ Pr OUT
  52     DTV_PB        O                 DTV_ Pb OUT
  53      DTV_Y        O                 DTV_ Y OUT
  54    TPA_MODE       O        CHECK EARPHONE CONNECT OUT
  55     EPOUT_L       I           Audio EARPHONE L CH IN
  56     EPOUT_R       I           Audio EARPHONE R CH IN
  57     AMP_WF        I              Audio Sub woofer IN
  58      LINE_L       I              Audio Line L CH IN
  59      LINE_R       I              Audio Line R CH IN
  60       GND         -                        GND
  61     SAL_SC2       O           Audio CVBS2/SV2 L ch OUT
  62     SAR_SC2       O           Audio CVBS2/SV2 R ch OUT
  63    CVBSAL_SC1     O           Audio CVBS1/SV1 L ch OUT
  64    CVBSAR_SC1     O           Audio CVBS1/SV1 R ch OUT
  65       GND         -                        GND
  66       SCL         I                Software I2C Clk
  67       SDA        I/O               Software I2C data
  68      HWSDA       I/O               hardwae I2C data
  69      HWSCL        I                hardwae I2C clk
  70       GND         -                        GND
  71     CVBS_SC2      O                  CVBS2 OUT
  72    IF_YCVBS2      O               S-VIDEO2_Y OUT
  73      IF_C2        O               S-VIDEO2_C OUT
  74      ADC2         O                      A/D conver
  75      DTV_L        O              Audio DTV L ch OUT
  76      DTV_R        O              Audio DTV R ch OUT
  77      ADC1         O                      A/D conver
  78    DTV_SPDIF      O               DTV audio format
  79      ADC0         O                      A/D conver



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     80          DTV_IR         O                            DTV_IR pin


Function: S-Video1 1/2 In
Connector type: Mini Din
Specification: CNNT F 12PIN Mini Din DIP Right Angle 12 AMP( 2 S-Video)
                                      Pin Definition
  Pin No.       Pin Name       I/O                           Description
     1            GND            -                              GND
     2             GND           -                                GND
     3          S1AV_C2          I                         S-Video1_C2 In
     4          S1AV_Y2          I                         S-Video1_Y2 In
     5             GND           -                                GND
     6             GND           -                                GND
     7          S1AV_C1          I                         S-Video1_C1 In
     8          S1AV_Y1          I                         S-Video1_Y1 In
     9             GND           -                                GND
     10            GND           -                                GND
     11            GND           -                                GND
     12            GND           -                                GND
     13            GND           -                                GND


Function: CVBS 1/2 and CVBS 1/2 AUDIO 1/2 In
Connector type: RCA
Specification: CNNT-RCA*6 yellow&white&red / yellow&white&red
                                      Pin Definition
  Pin No.       Pin Name       I/O                           Description
     1           CVBS1           I                            CVBS1 In
     2         CVBS1_AR          I                        CVBS1 Audio_R In
     3         CVBS1_AL          I                        CVBS1 Audio_L In
     4           CVBS2           I                               CVBS2 In
     5         CVBS2_AR          I                        CVBS2 Audio_R In
     6         CVBS2_AL          I                        CVBS2 Audio_L In
     7             GND           -                                GND
     8             GND           -                                GND
     9             GND           -                                GND




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Function: Earphone Out
Connector type: PHONE JACK
Specification: CNNT-EAR Phone Jack-H-F-5pin-3.6-Dip
                                         Pin Definition
  Pin No.      Pin Name          I/O                           Description
     1        EAR_ROUT            O                          EAR Audio_R OUT
     2            GND              -                                GND
     3        TPA_MODE            O                             TPA_MODE
     4         EAR_LOUT           O                          EAR Audio_L OUT
     5            GND              -                                GND


Function: Audio Output Port (Line Out)
Connector type: RCA
Specification: CNNT-RCA*2       white / red
                                         Pin Definition
  Pin No.      Pin Name          I/O                           Description
     1          LINE_L            O                          Audio Line_L Out
     2          LINE_R            O                          Audio Line_R Out
     3            GND              -                                GND


Function: Component 1/2 (YPbPr1/YcbCr1) In
Connector type: RCA
Specification: CNNT-RCA*6       green&blue&red / green&blue&red
                                         Pin Definition
  Pin No.      Pin Name          I/O                           Description
     1         COM1_Y              I                         Component1_Y In
     2         COM1_Pb             I                         Component1_Pb In
     3          COM1_Pr            I                         Component1_Pr In
     4          COM2_Y             I                         Component2_Y In
     5         COM2_Cb             I                         Component2_Cb In
     6          COM2_Cr            I                         Component2_Cr In
     7            GND              -                                GND
     8            GND              -                                GND
     9            GND              -                                GND


Function: Component 1/2 Audio 1/2 In



                                                                       DigiMedia
                                                         Doc No.
                    Service Manual
 TITLE                                                   Version                    1.0
                  LCD TV For LT37HVS                      Page                     18/39

Connector type: RCA
Specification: CNNT-RCA*4      white&red / white&red
                                        Pin Definition
  Pin No.      Pin Name          I/O                          Description
     1         COM1_AL             I                      Component1 Audio_L In
     2         COM1_AR             I                      Component1 Audio_R In
     3         COM2_AL             I                      Component2 Audio_L In
     4         COM2_AR             I                      Component2 Audio_R In
     5            GND              -                                 GND
     6            GND              -                                 GND


Function: Digital Tuner Out
Connector type:MD32-I20003
Specification: CNNT M 32pin (16x2) pitch 2.0mm DIP straight
                                        Pin Definition
  Pin No.      Pin Name          I/O                             Description
     1         V5_TUNER           O                            POWER OUT_5V
     2            +12V            O                           POWER OUT_12V
     3         V5_TUNER           O                            POWER OUT_5V
     4            +12V            O                           POWER OUT_12V
     5            GND              -                                 GND
     6            GND              -                                 GND
     7         S2DTV_TX            I                          SYS TO DTV_TX IN
     8           RESETn           O                                 RESET
     9         S2DTV_RX            I                          SYS TO DTV_RX IN
     10        MAIN_DE             I                            MAIN_DE pin
     11           GND              -                                 GND
     12           GND              -                                 GND
     13       PC2DTV_TX            I                          PC TO DTV_TX IN
     14           SCL              I                           Sofeware I2C Clk
     15       PC2DTV_RX            I                          PC TO DTV_RX IN
     16           SDA             I/O                          Sofeware I2C data
     17           GND              -                                 GND
     18           GND              -                                 GND
     19          DTV_Y             I                               DTV_Y In
     20        DTV_SPDIF           I                           DTV audio format



                                                                         DigiMedia
                                                     Doc No.
                  Service Manual
 TITLE                                               Version                 1.0
                LCD TV For LT37HVS                    Page                  19/39

    21          GND            -                                 GND
    22       DTV_SPDIF         I                        DTV audio format
    23        DTV_Pb           I                               DTV_Pb In
    24          GND            -                                 GND
    25          GND            -                                 GND
    26         DTV_L           I                        Audio DTV L ch IN
    27         DTV_Pr          I                               DTV_Pr In
    28         DTV_R           I                       Audio DTV R ch IN
    29        DTV_DL           I                           DTV_DL pin
    30         DTV_IR          I                           DTV_IR pin
    31        DTV_NM           I                           DTV_NM pin
    32          GND            -                                 GND


P2S BOARD
Function: TUNER OUT / AV OUT P2S TO SYSTEM BOARD
Connector type: BOARD TO BOARD
Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board)
                                    Pin Definition
  Pin No.    Pin Name         I/O                         Description
     1       CHKTNR1           O                       CHECK AV Board In
    2        V5_TUNER          I                          POWER IN_5V
    3        V5_TUNER          I                          POWER IN_5V
    4           GND            -                                 GND
    5           GND            -                                 GND
    6            NC            -                          No connection
    7            NC            -                          No connection
    8            NC            -                          No connection
    9            NC            -                          No connection
    10          GND            -                                 GND
    11         HD_PR           O                           HD_PR OUT
    12         HD_PB           O                           HD_PB OUT
    13         HD_Y            O                           HD_Y OUT
    14        SV_SEL1          I                          S_Video_SEL
    15          GND            -                                 GND
    16        ALO_SC2          I                     Scart2 AUDIO_L CH IN
    17        ARO_SC2          I                     Scart2 AUDIO_R CH IN



                                                                     DigiMedia
                               Doc No.
            Service Manual
TITLE                          Version                1.0
          LCD TV For LT37HVS    Page                 20/39

  18     ALO_SC1      I         Scart1 AUDIO_L CH IN
  19     ARO_SC1      I         Scart1 AUDIO_R CH IN
  20       GND        -                   GND
  21     YCBCR_L      I        YCBCR AUDIO_L CH IN
  22     YCBCR_R      I        YCBCR AUDIO_R CH IN
  23     HDTV_L       I        HDTV_L AUDIO_L CH IN
  24     HDTV_R       I        HDTV_L AUDIO_R CH IN
  25       GND        -                   GND
  26     SIF1_OUT     O           SIF format _OUT1
  27     SIF2_OUT     O           SIF format _OUT2
  28       GND        -                   GND
  29    IF_TU2CVBS    O           Tuner2 CVBS OUT
  30    IF_TU1CVBS    O           Tuner1 CVBS OUT
  31       GND        -                   GND
  32     V12_SYS2     I                  +12V IN
  33       NC         -             No connection
  34       NC         -             No connection
  35     V12_SYS2     I                  +12V IN
  36    PC2DTV_TX     O         PC TO DTV_TX OUT
  37    PC2DTV_RX     O         PC TO DTV_RX OUT
  38    S2DTV_TX      O         SYS TO DTV_TX OUT
  39    S2DTV_RX      O         SYS TO DTV_RX OUT
  40     RESETn       O                  RESET
  41       GND        -                   GND
  42    CVBS_SC1      O              CVBS1 OUT
  43    IF_YCVBS      O           S-VIDEO1_Y OUT
  44       IF_C       O           S-VIDEO1_C OUT
  45       GND        -                   GND
  46    OCVBS_SC2     I             Scart2 cvbs IN
  47      IF_CR       O           YCBCR_CR OUT
  48      IF_CB       O           YCBCR_CB OUT
  49       IF_Y       O            YCBCR_Y OUT
  50       GND        -                   GND
  51     DTV_PR       O             DTV_ Pr OUT
  52     DTV_PB       O             DTV_ Pb OUT
  53      DTV_Y       O             DTV_ Y OUT



                                              DigiMedia
                                                        Doc No.
                   Service Manual
 TITLE                                                  Version                  1.0
                 LCD TV For LT37HVS                      Page                   21/39

    54        TPA_MODE           O               CHECK EARPHONE CONNECT OUT
    55         EPOUT_L            I                   Audio EARPHONE L CH IN
    56         EPOUT_R            I                   Audio EARPHONE R CH IN
    57         AMP_WF             I                       Audio Sub woofer IN
    58          LINE_L            I                       Audio Line L CH IN
    59          LINE_R            I                       Audio Line R CH IN
    60           GND              -                                 GND
    61         SAL_SC2           O                   Audio CVBS2/SV2 L ch OUT
    62         SAR_SC2           O                   Audio CVBS2/SV2 R ch OUT
    63       CVBSAL_SC1          O                   Audio CVBS1/SV1 L ch OUT
    64       CVBSAR_SC1          O                   Audio CVBS1/SV1 R ch OUT
    65           GND              -                                 GND
    66            SCL             I                         Software I2C Clk
    67            SDA            I/O                        Software I2C data
    68          HWSDA            I/O                        hardwae I2C data
    69          HWSCL             I                         hardwae I2C clk
    70           GND              -                                 GND
    71        CVBS_SC2           O                            CVBS2 OUT
    72        IF_YCVBS2          O                         S-VIDEO2_Y OUT
    73           IF_C2           O                         S-VIDEO2_C OUT
    74           ADC2            O                                A/D conver
    75          DTV_L            O                       Audio DTV L ch OUT
    76          DTV_R            O                       Audio DTV R ch OUT
    77           ADC1            O                                A/D conver
    78        DTV_SPDIF          O                         DTV audio format
    79           ADC0            O                                A/D conver
    80          DTV_IR           O                            DTV_IR pin


Function: TUNER IN /AV IN TUNER TO P2S BOARD
Connector type: BOARD TO BOARD
Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board)
                                       Pin Definition
  Pin No.      Pin Name         I/O                          Description
     1         CHKTNR1            I                       CHECK AV Board In
     2        V5_TUNER           O                         POWER OUT_5V
     3        V5_TUNER           O                         POWER OUT_5V



                                                                         DigiMedia
                                Doc No.
             Service Manual
TITLE                           Version                1.0
           LCD TV For LT37HVS    Page                 22/39

  4        GND         -                    GND
  5        GND         -                    GND
  6         NC         -             No connection
  7         NC         -             No connection
  8         NC         -             No connection
  9         NC         -             No connection
  10       GND         -                    GND
  11      HD_PR        I                  HD_PR In
  12      HD_PB        I                  HD_PB In
  13      HD_Y         I                  HD_Y In
  14     SV_SEL1       O             S_Video_SEL
  15       GND         -                    GND
  16     ALO_SC2       O         Scart2 AUDIO_L CH out
  17     ARO_SC2       O         Scart2 AUDIO_R CH out
  18     ALO_SC1       O         Scart1 AUDIO_L CH out
  19     ARO_SC1       O         Scart1 AUDIO_R CH out
  20       GND         -                    GND
  21     YCBCR_L       O        YCBCR AUDIO_L CH out
  22     YCBCR_R       O        YCBCR AUDIO_R CH out
  23     HDTV_L        O        HDTV_L AUDIO_L CH out
  24     HDTV_R        O        HDTV_L AUDIO_R CH out
  25       GND         -                    GND
  26      SIF1_IN      I            SIF format _IN1
  27      SIF2_IN      I            SIF format _IN2
  28       GND         -                    GND
  29    IF_TU2CVBS     I            Tuner2 CVBS IN
  30    IF_TU1CVBS     I            Tuner1 CVBS IN
  31       GND         -                    GND
  32     V12_SYS2      O                  +12V OUT
  33        NC         -             No connection
  34        NC         -             No connection
  35     V12_SYS2      O                  +12V OUT
  36    PC2DTV_TX      I           PC TO DTV_TX IN
  37    PC2DTV_RX      I           PC TO DTV_RX IN
  38    S2DTV_TX       I          SYS TO DTV_TX IN
  39    S2DTV_RX       I          SYS TO DTV_RX IN



                                               DigiMedia
                                   Doc No.
             Service Manual
TITLE                              Version                  1.0
           LCD TV For LT37HVS       Page                   23/39

  40      RESETn       I                      RESET
  41       GND         -                       GND
  42     CVBS_SC1      I                     CVBS1 IN
  43     IF_YCVBS      I               S-VIDEO1_Y In
  44       IF_C        I               S-VIDEO1_C In
  45       GND         -                       GND
  46    OCVBS_SC2      O                Scart2 cvbs out
  47      IF_CR        I                YCBCR_CR IN
  48      IF_CB        I                YCBCR_CB IN
  49       IF_Y        I                YCBCR_Y IN
  50       GND         -                       GND
  51     DTV_PR        I                     DTV_ Pr In
  52     DTV_PB        I                 DTV_ Pb In
  53      DTV_Y        I                     DTV_ Y In
  54    TPA_MODE       I        CHECK EARPHONE CONNECT In
  55     EPOUT_L       O         Audio EARPHONE L CH OUT
  56     EPOUT_R       O         Audio EARPHONE R CH OUT
  57     AMP_WF        O            Audio Sub woofer OUT
  58      LINE_L       O             Audio Line L CH out
  59      LINE_R       O             Audio Line R CH out
  60       GND         -                       GND
  61     SAL_SC2       I           Audio CVBS2/SV2 L ch in
  62     SAR_SC2       I           Audio CVBS2/SV2 R ch in
  63    CVBSAL_SC1     I           Audio CVBS1/SV1 L ch in
  64    CVBSAR_SC1     I           Audio CVBS1/SV1 R ch in
  65       GND         -                       GND
  66       SCL         O               Software I2C Clk
  67       SDA        I/O              Software I2C data
  68      HWSDA       I/O              hardwae I2C data
  69      HWSCL        O               hardwae I2C clk
  70       GND         -                       GND
  71     CVBS_SC2      I                     CVBS2 IN
  72    IF_YCVBS2      I               S-VIDEO2_Y In
  73      IF_C2        I               S-VIDEO2_C In
  74      ADC2         I                     A/D conver
  75      DTV_L        I              Audio DTV L ch in



                                                    DigiMedia
                                                      Doc No.
                   Service Manual
 TITLE                                                Version                 1.0
                 LCD TV For LT37HVS                    Page                  24/39

    76          DTV_R           I                        Audio DTV R ch in
    77           ADC1           I                               A/D conver
    78        DTV_SPDIF         I                        DTV audio format
    79           ADC0           I                               A/D conver
    80          DTV_IR          I                           DTV_IR pin


Function: Power Input
Connector type:M5-I25002
Specification: CNNT M 5PIN pitch 2.5mm DIP straight
                                     Pin Definition
  Pin No.      Pin Name        I/O                         Description
     1           +V18            I                       DC Power 18V IN
     2           +V18           I                        DC Power 18V IN
     3           GND            -                                 GND
     4           GND            -                                 GND
     5            NC            -                          No connection


Function: Power Output
Connector type:M6-I25002
Specification: CNNT M 6PIN pitch 2.5mm DIP straight
                                     Pin Definition
  Pin No.      Pin Name        I/O                         Description
     1           +V12           O                       DC Power 12V OUT
     2           +V12          O                        DC Power 12V OUT
     3           GND            -                                 GND
     4           GND            -                                 GND
     5           +V18          O                        DC Power 18V OUT
     6           +V18          O                        DC Power 18V OUT


KEYPAD BOARD
Function: Keypad In
Connector type: M15-I20001
Specification: CNNT M 15PIN pitch 2.0mm DIP Straight WST
                                     Pin Definition
  Pin No.      Pin Name        I/O                          Description
     1            NC             -                              NC


                                                                       DigiMedia
                                                      Doc No.
                    Service Manual
 TITLE                                                Version                 1.0
                  LCD TV For LT37HVS                   Page                  25/39

     2           LED_B1        I                      Signal for Indicator LED
     3           LED_B1        I                      Signal for Indicator LED
     4           LED_B1        I                      Signal for Indicator LED
     5                GND      -                                GND
     6                IRD      O                            IR Data Out
     7                GND      -                                GND
     8           KEY_Y3        O               Signal sent from Keypad to System 3
     9           KEY_Y2        O               Signal sent from Keypad to System 2
     10          KEY_Y1        O               Signal sent from Keypad to System 1
     11          KEY_X3        I               Signal sent from System to Keypad 3
     12          KEY_X2        I               Signal sent from System to Keypad 2
     13          KEY_X1        I               Signal sent from System to Keypad 1
     14               GND      -                                GND
     15           V5_IR        I                           5V POWER In


Function: Indicator Out
Connector type: M3-I20001
Specification: CNNT M 3PIN pitch 2.0mm DIP Straight WST
                                    Pin Definition
  Pin No.       Pin Name      I/O                          Description
     1         V5_Indicator    O                          5V POWER Out
     2           LED_B1        I                      Signal for Indicator LED
     3                GND      -                                GND


INDICATOR BOARD
Function: Signal In
Connector type: M3-I20001
Specification: CNNT M 3PIN pitch 2.0mm DIP straight
                                    Pin Definition
  Pin No.       Pin Name      I/O                           Description
     1          V5_KEY1         I                          5V POWER IN
     2                LED      I                      Signal for Indicator LED
     3                GND      -                                GND




                                                                    DigiMedia
                                                             Doc No.
                   Service Manual
 TITLE                                                       Version                  1.0
                 LCD TV For LT37HVS                           Page                   26/39


3. Troubleshooting
3.1 No Power



                          No Power




                                                                            Power plug is
                   Check power plug is
                                                                No          securely inserted
                   securely inserted into the
                                                                            into the power
                   power socket?
                                                                            socket.



                          Yes




               1. Check power to system cable
               2.Check system to keypad cable                          No   Please replace the
               3.Check power to panel cable
                                                                            cable what cause the
               4.Check keypad and remote
                                                                            power on failed.
               control power key connector
               insert?




                          Yes


    If power on still failed, please replace power module.




                                                                            DigiMedia
                                                       Doc No.
                    Service Manual
 TITLE                                                 Version             1.0
                  LCD TV For LT37HVS                    Page              27/39

3.2 No Sound



                          No Sound




                                                                 Please connection
                    Check the speaker wire
                                                          No     the speaker wire to
                    connector to system
                                                                 system board.
                    board?




                           Yes




                                                                 Confirm input
                   Check the input source
                                                          No     source and audio
                   and audio cable into the
                                                                 cable select to the
                   correct connector?
                                                                 correct channel.




                           Yes




    1.   Keep OSD is not in mute mode.
    2.   Confirm the volume value is not 0.
    3.   Power off, and re-plug power socket again.
    4.   If items 1,2 and 3 have no problem, replace
         interface board or system board.




                                                                 DigiMedia
                                                     Doc No.
                   Service Manual
 TITLE                                               Version             1.0
                 LCD TV For LT37HVS                   Page              28/39

3.3 No Source Input



          RGB or video source can't be found




                                                               Confirm input
                   Check OSD select
                                                        No     source and the
                   correct?
                                                               output of OSD select
                                                               is correct.



                          Yes




                                                               Check input source
                  Check image signal input
                                                        No     cable connection
                  at system board or
                                                               into the connector.
                  interface board?




                          Yes




          Replace system board or interface board.




                                                               DigiMedia
                                                           Doc No.
                      Service Manual
 TITLE                                                     Version             1.0
                    LCD TV For LT37HVS                      Page              29/39

3.4 Keypad Failed



                                     Keypad no response




                     1. Check the cable of keypad to system board.
                     2. Check keypad function.
                     3. If item 1 and 2 have no problem, please replace
                        keypad board or system board.




                                                                          DigiMedia
                                                Doc No.
                   Service Manual
 TITLE                                          Version              1.0
                 LCD TV For LT37HVS              Page               30/39

3.5 IR Failed



                      IR no response




                    Check F/W vision?                     Reinstall F/W .
                                                No




                         Yes




                  Check remote control
                                                           Change remote
                  has energy?                        No
                                                           control battery.




                         Yes




                  Check keypad board                       Please connection
                                                     No
                  connection into system                   the keypad board
                  board?                                   into system board.



                         Yes


          Replace Keypad or remote control or
          system board.




                                                           DigiMedia
                                              Doc No.
                   Service Manual
 TITLE                                        Version                1.0
                 LCD TV For LT37HVS            Page                 31/39

3.6 Indicator LED Failed

               Indicator LED is not bright




                  Check the cable of                     Please connection the
                                              No
                  indicator board to keypad              cable of indicator board
                  board?                                 to keypad board.



                           Yes




                   Check the cable of                      Please connection the
                                                   No
                   keypad board to system                  cable of keypad board
                   board?                                  to system board.


                           Yes


                                                        Please connection the
                  Check indicator board or     No
                                                        indicator board into
                  keypad board connector                keypad board or keypad
                  insert?                               board into system board.

                           Yes


                  Replace indicator board.




                  If indicator LED still
                  unlighted, please replace
                  keypad board or system
                  board.




                                                           DigiMedia
                                                           Doc No.
                       Service Manual
 TITLE                                                     Version                  1.0
                     LCD TV For LT37HVS                     Page                   32/39

4. Firmware upgrade applications

1.     Update Firmware tools
     1.PC(Notebook)
     2. transmission line as Figure1
     3.Sofeware(MtkTool.exe , COMPR.DLL , MTKDLL.DLL)
                                                                Figure1
2.     Cable switch: on D side (refer Figure2)




                                                                                       Figure2


3.     Insert the power cord and RS232 cable.


4.     Insert RS232 cable in Mouse socket or RS232 socket(refer Figure3) and other side insert to
       service socket on TV(refer Figure4 and Figure5)




       Figure3                           Figure4                       Figure5

5.     There are some files should be in directory. (MtkTool.exe , COMPR.DLL , MTKDLL.DLL)




                                       Figure6


6.     Execute MtkTool.exe.(step 6 and step 7 please refer Figure 6)

7.     Make sure IC model is MT8205, serial connection is correct(default is COM1) and baud rate is
       115200.


                                                                           DigiMedia
                                                         Doc No.
                   Service Manual
TITLE                                                    Version                  1.0
                 LCD TV For LT37HVS                       Page                   33/39

8.  Click the Browse of "Load Bin file option" to choose the correct firmware.
9. Click the bottom of Upgrade, System will start upgrade firmware, when it fished the operation, list
    form has to show the "Finished" as blow arrow (step 8 and step 10 please refer the Figure7)
10. pull out the RS232 cable and AC cord.




                                                                                    Figure7




                                                                        DigiMedia
                                                        Doc No.
                     Service Manual
 TITLE                                                  Version            1.0
                   LCD TV For LT37HVS                    Page             34/39


5. Disaggregate Graphic
5.1 TV Box




       1. Loosen 4 screws as blue circles.
       2. Pull up the TV Box Cover as red arrow.
       3. Pull up the TV Box out as blue arrow.




5.2 Stand Module




                           1. Loosen handle screws as blue circles.




                                                



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