Daewoo GB20H4 T1, GB20H3 T1, GB21H4 T1, GB14H4 T2, GB20H3 T2 Service Manual

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TV / VCR Combination CHASSIS : CP-082

Model :GB14H3/14H4/20H3/20H4/21H4 T1/T2

14H3/14H4/20H3/20H4/21H4 T1/T2 F14H3/14H4/20H3/20H4/21H4 T1/T2 K14H3/14H4/20H3/20H4/21H4 T1/T2

SPECIFICATIONS

GB14H3/14H4/20H3/20H4/21H4 T1/T2

ITEMS MODEL 14H3/14H4/20H3/20H4/21H4 T1/T2 REMARK

F14H3/14H4/20H3/20H4/21H4 T1/T2 K14H3/14H4/20H3/20H4/21H4 T1/T2

TV SECTION STANDARD PAL-I/II(GB MODEL),PAL-B/G(BLANK MODEL),PAL-B/G,SECAM-L/L(F MODEL)

PAL/SECAM-B/G,DK(K MODEL)

SCREEN SIZE 14”:A34JLL90X01, A34AGT14X71, A33EKC01X01, A34EAC01X06

20”:A48JLL90X02, A48LPE01X01, A48EAX33X081 21”:A51EAL155X17, A51EFS83X181, A51EBV13X09

MAIN VOLTAGE 220~240V AC,50Hz

POWER STAND BY MODE : BELOW 5 Watts

CONSUMPTION OPERATION MODE : 14”=59Watts, 20”=65Watts, 21”=69Watts

SOUND OUTPUT 1Wmin(14”), 1.5Wmin(20”), 1.5Wmin(21”)

SPEAKER 3Watts 8 Ohm

ANTENNA IMPEDANCE 75 Ohm unbalanced input

TUNING SYSTEM FVS(FREQUENCY SYNTHESIS) TUNING

TUNER VHF-L : E2-S7, VHF-H : S8-S36, UHF : S37-E69 (PAL-I=UHF ONLY)

NUMBER OF PROGRAM

100 PROGRAM

AUX. TERMINAL SCART JA CK(REAR) , RCA JACK(AV2 FRONT), HEADPHONE J ACK

REMOTE CONTROLLER R-46C with 2 “AAA” type batteries

OTHER FEATURE ON SCREEN DISPLAY, SLEEP TIMER, WAKE UP TIMER, FULL AUTO SEARCH,

MANUAL/FINE TUNING,CHILD LOCK, PANEL LOCK, AUTO REPEAT, PICTURE TYPE SELECTION (NORMAL 1/2, FAVOURITE), INDEX SEARCH, TV/AV

VIDEO SINGLE SYSTEM PAL/SECAM colour and CCIR mono chrome signals, 625lines/50fields.

SECTION RECORDING SYSTEM 2HEAD / 4HEAD

INPUT 1Vp-p, 75 ohm, unbalanced

OUTPUT 1Vp-p, 75 ohm, unbalanced

SIGNAL TO NOISE RATIO 45dB with NETTETE IMAGE control at center position

HORIZONT AL RESOLUTION 240lines with NETTETE IMAGE control at center position

AUDIO RECORDING SYSTEM LONGITUDINAL TRACK

INPUT -3.8dBm(500m Vrms), more than 47 Kohms, unbalanced

OUTPUT -3.8dBm(500m Vrms), less than 1 Kohms, unbalanced

FREQUENCY RANGE 100Hz to 8KHz

SIGNAL TO NOISE RATIO 40dB(more than)

GENERA TEMPERATRE 5oC to 35oC(operating), -20oC to 60oC (storage temperature)

FORMAT standard T APE WIDTH 12.65mm TAPE SPEED SP : 23.39mm/sec, LP : 11.70mm/sec

WITH FULLSIZE SP : 240 min, win E-240 video cassette

CASSETTE LP : 480min, win E-240 video cassette

S/M No. : TCP082AEFO

Service Manual

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr April.2001

TABLE OF CONTENTS

SAFETY INSTRUCTION ....................................................................................................... 2

SPECIFICATION................................................................................................................... 3

CIRCUIT BLOCK DIAGRAM................................................................................................. 4

ALIGNMENT INSTRUCTIONS .............................................................................................. 5

SERVICE REMOCON DIAGRAM .......................................................................................... 8

SCHEMATIC DIAGRAM........................................................................................................ 11

EXPLODED VIEW................................................................................................................. 13

PRINTED CIRCUIT BOARD.................................................................................................. 18

SERVICE PARTS LIST ......................................................................................................... 20

Different parts list for inch...................................................................................................................................37

The different parts list for system & tuner ............................................................................................................39

The different parts list for crt...............................................................................................................................50

The different parts list for deck............................................................................................................................51

The different parts list for remote control.............................................................................................................52

SAFETY INSTRUCTION

CAUTION

WARNING : BEFORE SER VICING THIS CHASSIS,READ THE “X-RA Y RADIATION PRECAUTION”, “ SAFETY PRECAUTION” AND “PRODUCTION SAFETY NO TICE” BELOW.

X-RA Y RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazard ous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit The nominal value of the highvoltage of this receiver is 23-25KV(14”),25-28KV(20”),25~29KV(21”) at max. beam current, The high voltage must not,under any circumstances, exceed 26KV(14”),30KV(20”),31KV(21”). Each time a receiver requires servicing,the high voltage should be checked. It is recommended the reading of the high voltage be recorded as a part of the ser vice records, It is impor tant 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 continuous X-RAY RADIATION protection, the replacemnt 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 necesary when working on high voltage equipment.

2) Always discharge the picture tube before handling the tube.The picture tube is highly evacuated and if briken, glass fragments will be violently expelled.

2. If any fuse in this TV receiveris blown, replace it with the FUSE specified in the Replacement Parts list.

3. When replacing a high wattage resistor ( metal oxide film resistor ) in circuit board, keep the resistor 10mm away from circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC260 volts, 50Hz. NEVER connect to DC supply or any other power or frequency.

PRODUCT SAFETY NO TICE

Many electrical and mechanical parts in this 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 substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create X-RAY Radiation.

GB14H3/14H4/20H3/20H4/21H4 T1/T2

MODEL 14H3/14H4/20H3/20H4/21H4 T1/T2 REMARK

ITEMS F14H3/14H4/20H3/20H4/21H4 T1/T2

K14H3/14H4/20H3/20H4/21H4 T1/T2 TV STANDARD PAL-I/II(GB MODEL),PAL-B/G(BLANK MODEL),PAL-B/G,SECAM-L/L(F MODEL) SECTION PAL/SECAM-B/G,DK(K MODEL)

SCREEN SIZE 14”:A34JLL90X01, A34AGT 14X71, A33EKC01X01, A34EAC01X06

20”:A48JLL90X02, A48LPE01X01, A48EAX33X081

21”:A51EAL155X17, A51EFS83X181, A51EBV13X09

MAIN VOLTAGE 220~240V AC,50Hz POWER STAND BY MODE : BELOW 5 Watts CONSUMPTION OPERATION MODE : 14”=59Watts, 20”=65Watts, 21”=69Watts SOUND OUTPUT 1Wmin(14”), 1.5Wmin(20”), 1.5Wmin(21”) SPEAKER 3Watts 8 Ohm ANTENNA IMPEDANCE 75 Ohm unbalanced input TUNING SYSTEM FVS(FREQUENCY SYNTHESIS) TUNING TUNER VHF-L : E2-S7,

VHF-H : S8-S36,

UHF : S37-E69 (PAL-1=UHF ONLY)

NUMBER OF PROGRAM 100 PROGRAM AUX, TERMINAL SCART JACK(REAR) , RCA JACK(AV2 FRONT), HEADPHONE JACK REMOTE CONTROLLER R-46C with “AAA” type batteries OTHER FEATURE ON SCREEN DISPLAY, SLEEP TIMER, WAKE UP TIMER

FULL AUTO SEARCH, MANUAL/FINE TUNING

CHILD LOCK, PANEL LOCK, AUTO REPEAT,

PICTURE TYPE SELECTION (NORMAL 1/2, FAVOURITE),

INDEX SEARCH, TV/AV VIDEO SINGLE SYSTEM PAL/SECAM colour and CCIR mono chrome signals, 625lines/50fidlds. SECTION RECORDING SYSTEM 2 HEAD / 4 HEAD

INPUT 1Vp-p, 75 ohm, unbalanced OUTPUT 1Vp-p, 75 ohm, unbalanced SIGNAL TO NOISE RATIO 45dB with NETTETE IMAGE control at center position HORIZONTAL RESOLUTION 240lines with NETTETE IMAGE control at center position

AUDIO RECORDING SYSTEM LONGITUDINAL TRACK

INPUT -3.8dBm(500m Vrms), more than 47 Kohms, unbalanced OUTPUT -3.8dBm(500m Vrms). less than 1 Kohms, unbalanced FREQUENCY RANGE 100Hz to 8KHz SIGNAL TO NOISE RATIO 40dB(more than)

GENERA TEMPERATRE 5oC to 35oC(operating)

-20oC to 60oC (storage temperature) FORMAT standard TAPE WIDTH 12.65mm TAPE SPEED SP : 23.39mm/sec, LP : 11.70mm/sec WITH FULLSIZE SP : 240 min, win E-240 video cassette CASSETTE LP : 480min, win E-240 video cassette

SPECIFICATION

CAUTION

CIRCUIT BLOCK DIAGRAM

ALIGNMENT INSTRUCTIONS

1. MAIN TUNER A GC

1) Set a Pattern Generator with RF level 62 2 dBuV, 210.25 MHz.

2) Connect a OSCILLOSCOPE PROBE to P101 (pin #1) ,(TUNER AGC INPUT).

3) Adjust AGC UP/DOWN KEY the voltage drop about 1V DC over below it’s maximum voltage.

2. SUB TUNER AGC

1) Set a pattern Generator with RF level 62 2dBuV, 210.25 MHz

2) Connect a OSCILLOSCOPE PROBE to P101(pin #3)

3) Press the REC-B key two times.

4) Ajust R157 on the MAIN PCB the voltage drop about 1V DC over below it’s maximum voltage.

3. SCREEN

1) Apply a COLOR BAR PATTERN SIGNAL.

2) Press the “SCREEN” KEY.

3) Connect a OSCILLOSCOPE PROBE to P901 ( CRT CATHODE R,G,B )

4) Adjust the screen volume on FBT such that the highest black level voltage 120V 5Vdc. *

Another methode

1) Press “AV Key” in condition of AV no signal.

2) Press the “SCREEN” KEY.

3) Connect a OSCILLOSCOPE PROBE to P901 ( CRT CATHODE R,G,B )

4) Adjust the screen volume on FBT such that the highest black level voltage 140V 5Vdc.

4. WHITE BALANCE

1) Apply a COLOR BAR PATTERN SIGNAL.

2) Adjust the R,G,B UP/DOWN KEY of the other color which did not appear on the screen to obtain WHITE.

5. FOCUS

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.

6. GEOMETRY

6-1. S-CORRECTION

1) Apply a CROSSHATCH PATTERN SIGNAL.

2) Adjust the S-CORR UP/DOWN KEY obtain the same distance between horizontal lines.

6-2. VERTICAL SLOPE

1) Apply a RETMA PATTERN SIGNAL.

2) Pressing the V-SLOPE +/- KEY, the lower half of the screen is blanked.

3) Adjust the border line of blanked picture coincident with the center marks of the patte using the V-SLOPE +/- KEY.

6-3. VERTICAL CENTER

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the center line of pattern coincident with the mechanical center marks of the CRT using the V-CENTER +/- KEY.

6-4. VERTICAL SIZE

The V-CENTER adjustment has to be done in advance.

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the upperside of the pattern coincident with the mechanical center marks of the CRT using the V-SIZE +/- KEY.

ALIGNMENT INSTRUCTIONS

6-5. HORIZONTAL CENTER

1) Apply a RETMA PATTERN SINGNAL.

2) Adjust picture centering with H-CENTER +/- KEY.

7. DECK ADJUSTMENT

7-1. X-POSITION AND P2,P3 ADJUSTMENT

1) Adjust point : X-POSITION

Checking point : oscilloscope ch1 = H/SW (PY03 #2)

oscilloscope ch2 = PB ENVE (PY03 #4) Tr iggering : CH1 Measuring Equipment : oscilloscope, path jig Mode : PLAYBACK, ATK OFF Test tape : DP-2 (6KHz)

Adjustment Procedure

1) Connect the PATH JIG to PY03 after Test tape PLAYBACK

2) Insert the DP-2 TAPE. ( Auto playback )

3) Pressing the “ATK OFF” KEY.

4) Adjust the waveform of PB ENVE to maximum(figure1) using X-position VR.

5) Adjust IN/OUTPUT GUIDE until the exact waveform appear as bellow figure2.

7-2. AUTO PG ADJUSTMENT

1) After adjustment of 7-1. Press the “REC.” button.

2) Eject the Test tape.

7-3. AZIMUTH ADJUSTMENT

1) Adjust point : AZIMUTH SCREW Checking point : SOUND OUTPUT (P601) Measuring Equipment : oscilloscope or audio level meter. Mode : PLAYBACK Test tape : DP-2 (6KHz)

Adjustment Procedure

1) Connect the measuring equipment to the AUDIO OUTPUT (P601) terminal.

2) After test tape playback, adjust the output level maximally by varing the azimuth screw.

3) Fix the azimuth screw with locking paint.

If EEPROM (I702) has been changed :

- Option data has to be changed and

- all alignment function has to be readjusted.

ALIGNMENT INSTRUCTIONS

SERVICE REMOCON

1. DIAGRAM

* To enter the “SERVICE MODE”

Press NORMAL => A V => SLEEP => CLEAR => PO WER b uttons in regular sequency within 10seconds using USER REMOCON after setting ST-BY .

SERVICE REMOCON

2. HOW TO CHECK TV SECTION WITHOUT VCR DECK

If you want to check TV section without DECK mechanism, then please perform in this order.

1)Pull out the power cord.

2)Remove the VCR DECK mechanism.

3) Supply the main power. ( Main sw on )

4) Wait for about 10 seconds. ( You can see the light of power LED if the TV is normal.)

5) Turn on the TV using the remocon. ( You can see the OSD "EMERGENCY" )

6) Check the TV section.

3. Refer to general adjustment

1) S-CORR +/- ( S-CORRECTION ) Press this button to adjust the same distance between horizontal lines on screen of crosshatch pattern.

2) V-SLOPE +/- ( VERTICAL SLOPE )

Press this button to adjust the border line of blanked picture coincident with the center marks of the pattern.

3) V-CENT +/- ( VERTICAL CENTER )

Press this button to adjust the center line of the pattern coincident with the mechanical center marks of the CRT on

screen of RETMA pattern.

4) V-SIZE +/- ( VERTICAL SIZE ) Press this button to adjust the upperside of the pattern coincident with the mechanical center marks the CRT on

screen of RETMA pattern.

5) H-CENT +/- ( HORIZONTAL CENTER )

Press this button to adjust picture centering with H-center on screen of RETMA pattern.

6) R,G,B +/- ( WHITE BALANCE )

The screen is become WHITE adjust R,G,B level by this button.

7) ATK OFF ( Auto tracking off )

Press this button to adjust X-Position adjustment. Front panel's LED's are lighted up if you press this button. Press the PB button.

ATK OFF : (RED, RED) ATK MIN : (BLINK, OFF)

ATK MAX : (OFF, BLINK) ATK ON : (BLINK,BLINK)

; LEFT LED = ST-BY, RIGHT LED = REC/T.REC

8) REC Press this button to adjust AUTO PG.

9) SCREEN Press this button to adjust the screen volume on FBT.

10) SHIP ( SHIPPING CONDITIONS ) Press this button to set the SHIPPING CONDITIONS.

11) REC-B (Only 2-TUNER Model) Press this button to adjust SUB TUNER AGC. Press once : picture is displayed colour pattern. Press once more : picture is displayed black/white pattern.

12) AGC +/Press this button to adjust MAIN TUNER AGC.

SERVICE REMOCON

13) STILL Press this button to enter the PAUSE/STILL mode.

14) STOP Press this button to enter the STOP mode.

15) REW/REV Press this button to enter the REW/REV mode.

16) PLAYBACK Press this button to enter the PLAYBACK mode.

17) FF/CUE Press this button to enter the FF/CUE mode.

18) LANGUAGE Press this button to enter the LANGUAGE SELECTION mode. You can select the language you want by press AGC + (moving up) or AGC - (moving down) buttons.

19) OSD-POS / OSD / OSD Press OSD-POS button to enter the OSD Position adjust mode. You can adjust OSD position you want by press OSD or OSD buttons.

20) COUNTRY SET Press this button to enter the COUNTRY SET mode. Press the this button :

Option1 (PAL-I/I system) Option2 (PAL-B/G system) Option3 (PAL-B/G, SECAM-L/L’ system) Option4 (PAL/SECAM-B/G, D/K system, EAST Europe) Option5 (PAL/SECAM-B/G, D/K system, Middle ASIA) Option6 (PAL-B/H system)

21) Tuner Option Press this button to set Tuner option. Press the this button : 1. Daewoo

2. Philips

3. LG

22) Text Option Press this button to set Text option Press the this button : 1. West Europe

2. East Europe

3. Cyrillic

4. Greek

5. Arabic

6. Iranian

If you forget your “child lock secret No.”

-> 1. Enter the SERVICE MODE.

2. POWER OFF/ON