Service Manuals, User Guides, Schematic Diagrams or docs for : BEKO TV BEKO chassis 14.2 BEKO chassis 14.2 02

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BEKO chassis 14.2 02


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SM-142
                                   R




         Service Manual - SM-142
CONTENTS                             PAGE

Safety Instructions                     1
Technical Specifications                2
Instructions Manual                     4
Pin Voltages of IC's                   15
Pin Voltages of Some Transistors       18
Oscillograms                           19
Electrical and Service Adjustments     21
Trouble Shooting Guide                 24
Convergence Adjustments                31
Channel Frequency Tables               33
Part List                              37
Circuit Diagrams                 Attached
         PIN VOLTAGES OF IC'S

                                                      IC101 (TDA956X H)
                       TV signal processor-Teletext Decoder with embedded u-Controller
 Pin                          Connection                    V DC (*)     Pin                    Connection              V DC (*)

       1 Volume +/-                                         3,2 (3,2)     41 Gnd for TV processor                         0 (0)
       2 Status 1                                             0 (0)       42 External CVBS input                          0 (0)
       3 Status 2                                             0 (0)       43 Gnd for TV processor                         0 (0)
       4 Digital ground for u-controller                      0 (0)       44 SVHS-Y input                                3.35 (0)
       5 Not connected                                     0.75 (0.25)    45 SVHS-C input                                 0 (0)
       6 Standby on/off                                    0.01 (3.9)     46 White stretch capacitor                      3.4 (0)
       7 Analog Gnd of text decoder and dig Gnd of TV         0 (0)       47 CVBS output                                2.8 (0.07)
         processor
       8 Secam PLL decoupling                                2.3 (0)      48 Audio output/AM audio output                3.45 (0)
       9 2nd supply voltage TV proc (8V)                   8.0 (0.26)     49 2nd IF video output (not conn.)
      10 Supply volt.deccoup. of dig. Gnd of TV              5.0 (0)      50 2nd RGB / YUV insertion input               0.17 (0)
         processor
      11 Phase 2 filter                                     2.73 (0)      51 Red input                                   2.6 (0)
      12 Phase 1 filter                                      3.9 (0)      52 Green input                                 2.6 (0)
      13 Gnd 3 for TV processor                               0 (0)       53 Blue input                                  2.6 (0)
      14 Decoupling bandgap                                  4.0 (0)      54 Beam current limiter input                2.6 -3.4 (0)
      15 AVL (90 versions) / East/West drive signal (110    3.0 (0.5)     55 Black current input / V-guard input        4.6-5.7 (0)
         versions)
      16 V-drive B output                                    1.0 (0)      56 Red output                                see oscilog.
      17 V-drive A output                                    1.0 (0)      57 Green output                              see oscilog.
      18 IF-1 input                                         1.87 (0)      58 Blue output                               see oscilog.
      19 IF-2 input                                         1.87 (0)      59 Analog supply of text decoder and           3.3 (3.3)
                                                                             dig.supply of TV proc (3.3V)
      20 Reference current input                             3.9 (0)      60 OTP programming voltage                      0 (0)
      21 Vertical sawtooth capacitor                         3.8 (0)      61 Dig. Supply to core (3.3V)                  3.3 (3.3)
      22 Tuner AGC output                                    4.3 (0)      62 X-tal Gnd                                    0 (0)
      23 Sound IF input 1                                    1.9 (0)      63 X-tal input
      24 Gnd                                                  0 (0)       64 X-tal output
      25 Gnd                                                  0 (0)       65 Programming Reset (not connected)            0 (0)
      26 Norrow band PLL filter                              2.2 (0)      66 Dig. Supply to periphery (3.3V)             3.3 (3.3)
      27 AVL (Automatic Vol. Levelling)                    0.42 (0.08)    67 SCL1 (Eeprom)                               3.3 (3.3)
      28 Ext. Audio (audio 2) input                        3.73 (0.08)    68 SDA1 (Eeprom)                               3.3 (3.3)
      29 Audio 3 input (not connected)                     3.73 (0.09)    69 IR input                                    3.3 (3.3)
      30 H-drive output                                    2.33 (0.26)    70 Not connected
      31 Sandcastle output-Hor.Fly.input                   0.56 (0.25)    71 SCL                                       see oscilog.
      32 Decoupling sound demodulator                        2.0 (0)      72 SDA                                       see oscilog.
      33 QSS intercarrier output / AM output               3.43 (0.3)     73 MSP reset (IC301)                            4.9 (0)
      34 EHT / overvoltage protection input                2.2 (0.08)     74 Mute                                         0 (3.3)
      35 IF-PLL loop filter                                 2.45 (0)      75 SVHS switching                              3.3 (3.3)
      36 Sound IF AGC                                        0.5 (0)      76 L/L' switching                              3.3 (3.3)
      37 QSS output                                          0.6 (0)      77 F Blank MM Not conn.                        3.3 (3.3)
      38 IF video / selected CVBS output                     3.0 (0)      78 Program +                                   3.3 (3.3)
      39 main supply voltage TV processor                  8.0 (0.25)     79 CVBS sync filter                            3.3 (1.8)
      40 Internal CVBS input                                 3.8 (0)      80 Program -                                   3.3 (3.3)


(*)      Standby values are given in parenthesis
Note: The function of pin 15, 27, 33 and 48 is dependent on the mode of operation (mono intercarrier mode / QSS IF amplifier
and East-West output or not) and is controlled by some software control bits.
                                   IC 301- MULTI STANDARD SOUND PROCESSOR (MSP 3400D)

 Pin                       Connection                     V DC       Pin                    Connection       V DC
       1 Not connected                                               33 Scart 2 sound output (R)               3.7
       2 Gnd                                                0        34 Scart 2 sound output (L)               3.7
       3 Gnd                                                0        35 Gnd                                    0
       4 Gnd                                                0        36 Scart 1 sound output (R)               3.7
       5 Gnd                                                0        37 Scart 1 sound output (L)               3.7
       6 Gnd                                                0        38 Volume capacitor Main
       7 Supply                                            4.9       39 Analog Supply                          8
       8 Supply                                            4.9       40 Volume capacitor Aux
       9 SCL                                             2.4-2.6     41 Gnd                                    0
      10 SDA                                             1.8-2.1     42 Analog ref. supply                     3.7
      11 Not connected                                     2.4       43 Scart 4 input (L)                      3.7
      12 Not connected                                     2.4       44 Scart 4 input (R)                      3.7
      13 Not connected                                     2.4       45 Gnd                                    0
      14 Not connected                                     4.9       46 CINCH - sound input (L)                3.7
      15 Not connected                                     0.7       47 CINCH - sound input (R)                3.7
      16 Not connected                                     0.7       48 Gnd                                    0
      17 Not connected                                     0.7       49 Scart 2 sound input (L)                3.7
      18 Supply                                            4.9       50 Scart 2 sound input (R)                3.7
      19 Gnd                                                0        51 Gnd                                    0
      20 Not connected                                     0.7       52 Scart 1 input (R)                      3.7
      21 Gnd                                                0        53 Scart 1 input (L)                      3.7
      22 Gnd                                                0        54 A/D converter ref. Voltage             2.5
      23 Gnd                                                0        55 Mono sound input                       3.7
      24 MSP, RESET                                        4.9       56 Gnd                                    0
      25 Headphone sound output (R)                        2.1       57 Analog Supply                          4.9
      26 Headphone sound output (L)                        2.1       58 IF input 1                             1.5
      27 Gnd                                                0        59 -                                      1.5
      28 R-out                                           0.1-2.1     60 IF input 2                             0
      29 L-out                                           0.1-2.1     61 Gnd                                    0
      30 Dolby on (C)                                    0.1-2.1     62 Crystal oss. input                     2.3
      31 Dolby on (SUB)                                  0.1-2.1     63 Crystal oss. output                    2.3
      32 Dolby on (S)                                       0        64 Gnd                                    0


                                              IC303, IC304 Audio Output IC
 Pin                       Connection                     V DC       Pin                    Connection       V DC

       1 Left In                                           1.6         7                                     0,5-0,9
       2 Left In V                                         1.6         8 Right out                            14.2
       3 Mute                                             15.3         9 VS                                    28
       4 Right In V                                        1.6        10 Left out                             13.9
       5 Right In                                          1.6        11                                     0,5-0,9
       6 Gnd                                                0         12 Left In                              0.6


                                                    IC501 TDA835X
 Pin                       Connection                     V DC       Pin                    Connection       V DC

       1 Input A                                         0,98 (0)      6 Vertical Flyback Supply Voltage   45,6 (10,9)
       2 Input B                                         0.94 (0)      7 Output A                          7,64 (0,1)
       3 Supply voltage                                 14,7 (1.0)     8 Guard Output                        0,3 (0)
       4 Output B                                       7,55 (0,4)     9 Feedback Input                      7,9 (0)
       5 Gnd                                              0 (0)


                                                   IC601 MC44608 AP
 Pin                       Connection                     V DC       Pin                    Connection       V DC

       1 Demag                                          0.85 (0.0)     5 Driver                            2.1 (0.14)
       2 I sense                                        0.1 (0.32)     6 VCC                               12.3 (8.8)
       3 Control input                                   5 (5.5)       7 Not connected                          -
       4 Gnd                                                0          8 VI                                116 (117)
(*)      Standby values are given in parenthesis
                            IC701 TDA6107
Pin            Connection       V DC      Pin              Connection    V DC

  1 Red in                      2.3-2.5     6 Vdd supply                 190
  2 Green in                    2.5-2.7     7 Red out                   134-137
  3 Blue in                     2.5-2.7     8 Green out                 128-130
  4 Gnd                           0         9 Blue out                  130-137
  5 Black                       4.5-5.5
PIN VOLTAGES OF SOME TRANSISTORS

1. PH601 (PC127FY) PHOTOCOUPLER             2. T603 (BC848) NPN
    Pin    Standby VDC    ON VDC                      Standby VDC     TV ON VDC
     1         12.5         11                        B    C    E     B   C   E
    2           11.5             10           T603    0.6 0.02    0   0.1   0.3   0
    3           5.5               5
    4           8.8              12.3


3. T604 (BC848) NPN                         4. T605 (BC848) NPN

          Standby VDC       TV ON VDC                 Standby VDC      TV ON VDC

           B     C     E   B      C     E              B    C     E   B     C     E
  T604    0.02 12.7    0   0.7 0.05     0     T605    0.6 0.02    0   0.1   0.7   0


5. T606 (BC848) NPN                         6. T607 (BC848) NPN

          Standby VDC       TV ON VDC                 Standby VDC      TV ON VDC

           B     C     E   B      C     E              B    C     E   B     C     E
  T606    0.6    0     0   1     6.8    0     T607    0.6   0     0   0.1   2.5   0


7. T307 (BC848) NPN
          Standby VDC       TV ON VDC
           B     C     E   B      C     E
  T307    0.6    0     0   0.1   15     0
OSCILLOSGRAPHS OF SOME IC PINS
Note: TV is connected to a patern generator (Colour bar, sound 1 kHz).

1. IC101 (TDA956X)




                    Pin 30                                                   Pin 31
  2V/div, 20 usn/div, Vpp=4.9 V, 15625 kHz                 2V/div, 20 usn/div, Vpp=5.6 V, 15625 kHz




                    Pin 38                                                 Pin 40
  2V/div, 20 usn/div, Vpp=2.9 V, 15625 kHz              500 mV/div, 20 usn/div, Vpp=1.2 V, 15625 kHz




                   Pin 47                                                   Pin 55
500 mV/div, 20 usn/div, Vpp=2.1 V, 15625 kHz            500 mV/div, 20 usn/div, Vpp=1.65 V, 15625 kHz




                   Pin 56                                                  Pin 57
500 mV/div, 20 usn/div, Vpp=2.7 V, 15625 kHz            500 mV/div, 20 usn/div, Vpp=2.6 V, 15625 kHz




                   Pin 58                                                    Pin 71
500 mV/div, 20 usn/div, Vpp=2.4 V, 15625 kHz                     2 V/div, 1 msn/div, Vpp=5.2 V
                    Pin 72
        2 V/div, 1 msn/div, Vpp=5.2 V


2. IC301 (MSP34XX)




                   Pin 28                                      Pin 29
      500 mV/div, 1 msn/div, Vpp=1.8 V            500 mV/div, 1 msn/div, Vpp=1.8 V


3. IC501 (TDA835X)




                   Pin 1                                        Pin 2
  500 mV/div, 10 msn/div, Vpp=1.4 V, 50Hz      500 mV/div, 10 msn/div, Vpp=1.4 V, 50Hz




                   Pin 7
  500 mV/div, 10 msn/div, Vpp=44.6 V, 50Hz

4. T501 (2SK2381)




               Gate (EW drive)                             Drain (EW drive)
200 mV/div, 50 usn/div, Vpp=268 mV, 15625 Hz    2 V/div, 10 usn/div, Vpp=10.7 V, 50 Hz
1. ELECTRICAL ADJUSTMENTS

1.1. Supply Voltage Adjustment

Connect a digital voltmeter to the cathode of diode D611 at the AV1 mode of the TV and set the
screen voltage to the minimum with the screen potentiometer. Adjust the main supply voltage (B+)
with P601 potentiometer to the following value (after adjustment, readjust Screen voltage).
25"                   : 145 VDC
28"                   : 145 VDC (147 VDC for A66EAK071X11)
28" Pure Flat 16/9    : 140 VDC
28" Super Flat 16/9   : 140 VDC
29" Pure Flat         : 125 VDC
29" Super Flat        : 125 VDC
32" Pure Flat 16/9    : 140 VDC
32" Super Flat 16/9   : 131 VDC
33"                   : 158 VDC

2. SERVICE ADJUSTMENTS

You need the special service remote control to enter and exit the service menu of the TV (you can
order it from the manufacturer). All buttons of the Service RC are same with the user remote control,
only service menu In / Ot was added to it (please see the picture below).

Navigation
Service In/Out   : Enters to / exits from the Service Menu
P+ / P-          : Moves upward / downward inside the menu
V+ / V-          : Changes the value or option
Green & Red      : For screen adjustment (pls see the explanation below)
OK               : Changes the brightness, contrast values to 00, 3F and preset values sequentially (Its
                 OSD is shown). When P+ / P- buttons pressed the service menu is re shown.




2.1. AGC Adjustment

Apply a signal with amplitude 65



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