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cp-785a


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                         S/M No. : TCP785AEF0




Service Manual
59/68 Cm STEREO Color Television


MODEL                          CHASSIS
DTE-25G5THS                    CP-785A
DTE-29G5TH

FS-59T90                       CP-785A
FS-68T90




DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr                NOV. 2000
                                                                                                                      Service manual CP-785A




                                                                    Contents


1 - Main features ................................................................................................................................. 2
        1-1 Specifications .................................................................................................................... 2
        1-2 Channel table .................................................................................................................... 4


2 - Safety instruction .......................................................................................................................... 7

3 - Alignment instructions .................................................................................................................             8
        3-1 Microcontroller configuration : Service mode ....................................................................                            8
        3-2 Microcontroller configuration : Option................................................................................                       8
        3-3 TV set Alignment ...............................................................................................................             8

4 - IC description ................................................................................................................................      10
         4-1 TDA936x TV signal processor - TXT with embedded m-Controller. ..................................                                            10
         4-2 MSP3415D Multistandard Sound Processor .....................................................................                                18
         4-3 TDA894xJ Stereo Audio Amplifier.....................................................................................                        22
         4-4 TDA835xJ Vertical Amplifier..............................................................................................                   23
              4-4-1 TDA8358J...............................................................................................................              24

            4-5 TDA6107Q ........................................................................................................................ 25
            4-6 24C08 8 Kbit EEPROM ..................................................................................................... 26
            4-7 STR-F6654 ....................................................................................................................... 27

5 - Circuit description.........................................................................................................................         29
        5-1 Block diagram....................................................................................................................            29
        5-2 IF .......................................................................................................................................   33
        5-3 Source switching ...............................................................................................................             34
        5-4 u-Controller I/O pin configuration and function..................................................................                            34
        5-5 Sound processing..............................................................................................................               35
        5-6 Sound amplification ...........................................................................................................              37
        5-7 Vertical deflection ..............................................................................................................           37
        5-8 Power supply (STR-F6654) ...............................................................................................                     39
        5-9 TV start-up, TV normal run and stand by mode operations ..............................................                                       43

6 -Service parts list............................................................................................................................. 50
        FS-59T90 & FS-68T90 ........................................................................................................... 50
        (DTE-25G5THS & DTE-29G5TH)

7 - Exploded view ............................................................................................................................... 59

8 - PCB Layout .................................................................................................................................... 61

9 - Circuit Diagram.............................................................................................................................. 62
                                                               Service manual CP-785A

1-1 Specifications


TV standard                 PAL, SECAM - B/G, H
Sound system                NICAM B/G
                            FM 2Carrier B/G
Power consumption           25" : 113 W approx.
                            29" : 118 W approx.
Sound Output Power          25" : 5W x 5W (at 60% mod, 10%THD)
                            29" : 5W x 5W (at 60% mod, 10%THD)
Speaker                     25" : 7W 8 ohm x 2
                            29" : 7W 8 ohm x 2
Teletext system             10 pages memory FASTEXT (FLOF or TOP)
Aerial input                75 ohm unbalanced
Channel coverage            Off-air channels, S-cable channels and hyperband
Tuning system               frequency synthesiser tuning system
Visual screen size          25" : 59 cm
                            29" : 68 cm


Channel indication          On Screen Display
Program Selection           100 programmes
Aux. terminal               INPUT1(SCART) : Audio / Video In, S-VHS In(with cable)

                            INPUT2(RCA) : Audio / Video In

                            OUTPUT(RCA) : TV OUT
                            Headphone jack (3.5 mm) on front of cabinet
Remote Control Unit         R-40A01 / R-44N08(RD-D90)


RCA Jack - input 2

Pin    Signal Description    Matching value
1      Video Input           1.0 Vpp+/- 3dB , Impedance 75 ohm
2      Audio Input Left      0.5 Vrms, Impedance > 10k ohm
3      Audio Input Right     0.5 Vrms, Impedence > 10k ohm




                                              -2-
                                                                Service manual CP-785A

RCA Jack output
Pin   Signal Description      Matching value
1     TV Video                1.0Vpp +/- 3dB , Impedence 75 ohm
2     TV Audio Left           0.5Vrms at RF sound FM 54% Mod.(27kHz dev.)
3     TV Audio Right          0.5Vrms at RF sound FM 54% Mod.(27kHz dev.)

W
W


W
W



21 pin Euro SCART - Input 1 / S-Video

Pin   Signal Description      Matching value
1     N.C.
2     Audio Input Right       0.5 Vrms, Impedance > 10 kW
3     N.C.
4     Audio Earth
5     Earth
6     Audio Input Left        0.5 Vrms, Impedance > 10 kW
7     N.C.
8     N.C.
9     N.C.
10    N.C.
11    N.C.
12    N.C.
13    N.C
14    Earth
15    Chroma Input            +/- 3dB for a luminance signal of 1 Vpp
16    N.C.
17    Earth
18    Video In Earth
19    N.C.
20    Video Input / Y Input   1 Vpp +/- 3dB, Impedance 75 ohm
21    Common Earth




                                               -3-
                                               Service manual CP-785A

1-2 Channel table

FREQUENCY TABLE CP-785A

   CH        AUSTRALIA    N/Z'land
   C00           46.25
   C01           57.25
   C02           64.25
   C03           86.25
   C04           95.25
   C05          102.25
   C5A          138.25
   C06          175.25
   C07          182.25
   C08          189.25
   C09          196.25
   C10          209.25
   C11          216.75
   N01            -         45.25
   N02            -         55.25
   N03            -         62.25
   N08            -        203.25
   N09            -        210.25
   N10            -        217.25
   -                -         -            -              -
   C21          471.25
   C22          479.25
   C23          487.25
   C24          495.25
   C25          503.25
   C26          511.25
   C27          519.25
   C28          527.25
   C29          534.25
   C30          541.25
   C31          548.25
   C32          555.25
   C33          562.25
   C34          569.25
   C35          576.25
   C36          583.25
   C37          590.25
   C38          597.25
   C39          603.25
   C40          610.25
   C41          617.25




                                     -4-
                                   Service manual CP-785A


CH    AUSTRALIA   N/Z'land
C42      624.25
C43      631.25
C44      638.25
C45      645.25
C46      652.25
C47      659.25
C48      666.25
C49      673.25
C50      680.25
C51      687.25
C52      694.25
C53      701.25
C54      708.25
C55      715.25
C56      722.25
C57      729.25
C58      736.25
C59      743.25
C60      750.25
C61      757.25
C62      764.25
C63      771.25
C64      779.25
C65      786.25
C66      793.25
C67      800.25
C68      807.25
C69      814.25
C70        -
C71        -
C72        -
C73        -
C74        -
C75        -
C76        -
C77        -
S01      105.25
S02      112.25
S03      119.25
S04      126.25
S05      133.25
S06      140.25
S07      147.25
S08      154.25
S09      161.25




                             -5-
                                   Service manual CP-785A


CH    AUSTRALIA   N/Z'land
S10      168.25
S11      231.25
S12      238.25
S13      245.25
S14      252.25
S15      259.25
S16      266.25
S17      273.25
S18      280.25
S19      287.25
S20      294.25
S21      303.25
S22      311.25
S23      319.25
S24      327.25
S25      335.25
S26      343.25
S27      351.25
S28      359.25
S29      367.25
S30      375.25
S31      383.25
S32      391.25
S33      399.25
S34      407.25
S35      415.25
S36      423.25
S37      431.25
S38      439.25
S39      447.25
S40      455.25
S41      463.25




                             -6-
                                                                      Service manual CP-785A

2 - Safety instruction

WARNING: Only competent service personnel may carry out work involving the testing or repair of
this equipment.

X-RAY RADIATION PRECAUTION

1.    Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid
     such hazards, the high voltage must not exceed the specified limit. The nominal value of the high
     voltage of this receiver is 26~28 KV (25" - 29") at max beam current. The high voltage must not
     under any circumstances, exceed 29.5 KV (25") or 31 KV (29").
     Each time a receiver requires servicing, the high voltage should be checked. It is important to
     use an accurate and reliable high voltage meter.
2.   The only source of X-ray Radiation in this TV receiver is the picture tube. For continued X-ray
     RADIATION protection, the replacement tube must be exactly the same type tube as specified
     in the parts list.

SAFETY PRECAUTION

1.   Potentials of high voltage are present when this receiver is operating. Operation of the receiver
     outside the cabinet or with the back board removed involves a shock hazard from the receiver.
     1) Servicing should not be attempted by anyone who is not thoroughly familiar with the
           precautions necessary when working on high voltage equipment.
     2) Discharge the high potential of the picture tube before handling the tube. The picture tube is
         highly evacuated and if broken, glass fragments will be violently expelled.
2.   If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement
     Parts List.
3.   When replacing a high wattage resistor (oxide metal film resistor) in circuit board, keep the resistor
     10 mm away from circuit board.
4.   Keep wires away from high voltage or high temperature components.
5.   This receiver must operate under AC 240 volts, 5O Hz. NEVER connect to DC supply or any
     other power or frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the X-ray Radiation
protection afforded by them cannot necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are
identified in this manual and its supplements, electrical components having such features are identified
by designated symbol on the parts list. Before replacing any of these components, read the parts list in
this manual carefully. The use of substitutes replacement parts which do not have the same safety
characteristics as specified in the parts list may create X-ray Radiation.




                                                   -7-
                                                                   Service manual CP-785A

3 - Alignment instructions

3-1 Microcontroller configuration : Service mode
To switch the TV set into service mode please see instruction below.

1 - Select pr. number 91
2 - Adjust sharpness to minimum value and exit all menu.
3 - Quickly press the key sequence : RED - GREEN - menu

To exit SERVICE menu press menu key or Operate(Std By) key.

In Service Mode press "OK" to stop the microcontroller i.e. the I2C bus is free and the set can be
controlled by external equipment. Press "OK" again to allow the microcontroller to control the set
again

3-2 Microcontroller configuration : Option

  Option       Tuner maker                                  Remark
    0       DAEWOO / SAMSUNG             for Daewoo Remote control
    1       DAEWOO / SAMSUNG             for Daewoo Remote control
    4       DAEWOO / SAMSUNG             for NEC Remote control
    5       DAEWOO / SAMSUNG             for NEC Remote control

3-3 TV set Alignment
3-3-1 - G2 alignement
- TV in AV mode without video signal  Black screen.
- TV preset with WP Red, WP Green and WP Blue equal to 32.
- TV preset with Black R, Black G equal to 8.
- Set TV in NORMAL I mode
- Adjust screen volume ( on FBT ) such that the highest cathod cut-off voltage measured on CRT
board, is Vcut off 



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