Daewoo DV6T834, DV6T854, DV6T854N, DV6T844N, DV6T864N Service Manual

...

S/M No. : VTB834NET2

Service Manual

MODEL:DV6T834N/DV6T834

DV6T844N/DV6T844 DV6T854N/DV6T854 DV6T864N/DV6T864 DV6T935N/DV6T935 DV6T945N/DV6T945 DV6T955N/DV6T955 DV6T965N/DV6T965

✔ Caution :

In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

DAEWOO ELECTRONICS CO., LTD.

Sep. 2003

http : //svc.dwe.co.kr

SPECIFICATIONS...............................................................................................................2

ADVANTAGES OF THIS PRODUCT....................................................................................3

TROUBLE SHOOTING....................................................................................................................5

WAVEFORMS................................................................................................................................23

VOLTAGE CHARTS ......................................................................................................................26

CIRCUIT DIAGRAM.......................................................................................................................30

PCB CIRCUIT BOARD..................................................................................................................40

INSTRUMENT DISASSEMBLY .....................................................................................................43

ELECTRICAL PARTSLIST............................................................................................................53

CONTENTS

SPECIFICATIONS

DVD Audio output standards

Power AC 120V, 60Hz

Consumed electricity 24W (supplementary 4W)

Weight 4.6kg

Dimension (WxHxD) 435mm x 93mm x 255mm

Operative temperature +5¡C~35¡C

Installation condition Horizontal / Relative humidity under 80%

Received channels VHF: 2-13 CH / UHF: 14-69 CH / Cable: 1-125

Signal type NTSC COLOR

Antenna Input/output U/V-mixed: 75Ωunbalanced

VIDEO input 1.0 Vp-p unbalanced, RCA JACK

AUDIO input -8.8dBm, RCA JACK

VHF output 3 or 4 CH

VIDEO output

(common use of DVD and VCR)

VIDEO output terminal, 1.0 Vp-p unbalanced, RCA JACK

VIDEO output (DVD only) S-VIDEO output (75Ω In load Y: 1.0Vp-p, C:0.286Vp-p)

COMPONENT output (75ΩIn load Y: 1.0Vp-p, Pb:0.7Vp-p, Pr:0.7Vp-p)

AUDIO output

(common use of DVD and VCR)

Audio output terminal (2 kinds): -8.8dBm(VCR), 2.0Vrms(DVD), RCA JACK

AUDIO output (DVD only) Analogue AUDIO output (2 CH): 2.0Vrms

Digital audio output (COAXIAL)

Playable tape Very high dense tapes with VHS marks

Playable disc DVD, VIDEO-CD, CD (12mm), CD (8mm), MP3, CD-R, CD-RW

Tape speed SP: 33.35mm/s, SLP: 11.12mm/s

Playtime SP: 2hrs, SLP: 6hrs (use of T-120 tape)

Clock display 12 hrs AM/PM

Time Recording 8 programs a year

VIDEO S/N (VCR) Over 45dB(Standard recording)

Resolution VCR Over 220 lines (Standard recording)

DVD Over 500 lines (DVD Disc PLAY)

AUDIO (VCR) Over 69dB (Hi-Fi), over 40dB (Mono)

AUDIO (DVD) 90dB

AUDIO dynamic range 90dB

Disc type

DVD VIDEO-CD CD

Analogue Audio output 48/96KHz sampling 44.1KHz sampling 44.1KHz sampling

Digital Audio output 48KHz sampling 44.1KHz sampling 44.1KHz sampling

Output

ADVANTAGES OF THIS PRODUCT

¥ DVD, VCD, CD, CD-R(MP3), CD-RW, VHS playback function

¥ Watching DVD for recording broadcast

¥ Integrated remote control (VCR, DVD)

¥ VISS function

¥ Multiplex sound playback/record

¥ High Sound Quality of 6 head Hi-Fi (Hi-Fi Model only)

¥ One Touch timer Recording (OTR)

¥ Progressive scan

¥ MP3 file playback function (CD-R disc having records of MP3 files)

¥ GUI (Graphical User Interface) OSD (On Screen Display)

By using the [DISPLAY] button on the remote control, information on the DVD/VCD/CD player and disc, can be displayed on the TV screen.

¥ Screensaver function (DVD)

¥ 3D sound (3D sound effect using 2 speakers)

¥ High bit / high sampling with 27MHz / 10bit video encoder

This unit has 27MHz / 10bit capability, that enables the faithful reproduction of fine images.

¥ High bit / high sampling with 96KHz / 24bit audio D/A converter

With this 96KHz / 24bit linear Pulse Code Modulated signals, which constitute the highest specifications in the DVD standards, you can enjoy faithfully reproduced sound in all of its various modes. To support 96KHz sampling / 24bit sound, the shaping noise of this multi-level digital sigma type of D/A converter is kept flat up to 44KHz, thus preventing the important audio signals from being affected.

¥ Coaxial digital output (PCM, Dolby Digital, dts)

You can enjoy high-level digital audio by connecting with amp embedded with Dolby Digital / dts decoder.

¥ Built-in Dolby Digital decoder (DVD)

¥ Analog audio 2-channels output for DOWNMIX (x1)

¥ Composite video out (x1)

¥ Slow Forward / Reverse (DVD) playback

¥ Fast Forward / Reverse playback

¥ Search of title, chapter, and time in DVD disc, and search of track and time in VCD and CD

¥ Various TV aspect (DVD)

4:3 for Pan and Scan, 4:3 for Letter Box, and 16:9 for Wide

¥ Repeat playback (title and chapter for DVD, track and disc for VCD/CD)

ADVANTAGES OF THIS PRODUCT

¥ Repeat a defined period from A to B (DVD)

¥ Selective Play (DVD/VCD/CD)

You can select and play the desired title / chapter of DVD and track of Video CD/CD in STOP mode.

¥ Various languages OSD (On Screen Display) function (DVD)

You can select and display OSD among various languages. (English, French, Spanish)

¥ Parental Lock function (DVD)

This function can prevent playback of software that may be unsuitable for children.

¥ Multi Audio function (DVD)

The audio soundtrack can be heard in up to 8 languages. In the case of SVCD or CVD, it depends on the disc. (The number of audio languages depends on the software.)

¥ Multi Subtitle function (DVD)

The subtitle can be seen in up to 32 languages. In the case of SVCD or CVD, it depends on the disc. (The number of subtitle languages depends on the software.)

¥ Multi Angle function (DVD)

This function allows you to choose the viewing angle of scenes which were shot from a number of different angles. (The number of angles depends on the software.)

¥ Screen zoom function (DVD/VCD)

TROUBLESHOOTING

1. POWER CIRCUIT

✓ CAUTION

You must use insulated transformer during the first part test of POWER circuit.

Check IC601,IC751.

No power

POWER cord is ok?

Is 200V~140V voltage

obtained at C804 +?

Output voltage of 2

parts is normal?

Check

rectifier diode of 2

parts ;

D821, D822, D823, D826,

D827, D828, D830

Switching

pulse of Q801 collector is

normal?

Exchange POWER CORD

Check F801.

Exchange rectifier diode of 2

parts ; D821, D822, D823, D826,

D827, D828, D830.

Check Q801.

YES

2. SYSTEM CIRCUIT

TROUBLESHOOTING

No LED display.

Is 5V obtained at IC751

pin #9, 25?

Oscillation at IC751 pin #1?

Specific GRID/SEG doesnÕt function.

Check R830, D831, L751, L824.

Exchange IC751.

Check IC 751 pin #22~24, 27,

28, 30, 31.

Check IC 751 pin #10~12, 14~21.

YES

GRID output at PORT of IC751?

YES

SEGoutput at PORT of IC751?

Exchange IC751.

YES

A. LED DISPLAY

TROUBLESHOOTING

Noise appears on the

playback screen.

Is noise diminished by tracking

adjustment.

Noise band is trembled up and

down?

Re-adjust PATH.

Is the height of CTL HEAD normal?

No dust?

Is there problem in CTL Input

circuit and amplifier.

YES

Is there CTL pulse at IC601

pin#97?

Check IC601.

Noise appears on the screen even

though changing tape.

Re-adjust the height of AC HEAD.

Remove the dust.

Check C651, C652, R651~R653

IC601 pin #91, 92, 98.

Re-adjust PATH.

B-1. Bad playback quality (1)

YES

Noise appears on the Full

playback screen.

Are SW pulse and HA SW normal?

Recheck step B-1

(Bad playback quallty (1)).

Check HEAD AMP connector

and HEAD.

YES

ENVE Wave at PT01 pin #4?

Check VIDEO circuit.

Are there SW, HA SW pulse at

IC601 pin #16, 18?

Check PCB Pattern.

Check IC601.

B-2. Bad playback quality (2)

YES

TROUBLESHOOTING

No broadcasting signal

received

Is the output at IC601 pin# 71(CLK),

72 (DATA) normal?

Is SIF,Video output at TMI(RF101)

pin#13,16 normal?

Check IC 601.

Check IC301.

Check IC601.

YES

Is Video Signal input at IC601

pin#50?

Is there Video output at IC601

pin#52?

Check TMI (RF101) Block.

Check Video Buffer Q102

C. No broadcasting signal received

YES

TROUBLESHOOTING

Cassette tape isnÕt inserted.

Is 5V voltage obtained at Loading

parts IC601 pin#82?

Is 13V voltage obtained at

Capstan Motor P601 pin#8?

Check at EVER 13V

Check Q854.

Connect Capstan and Loading Motor. Check

connector and Capstan Motor.

YES

Is 12V voltage obtained at Each

parts of Loading Motor?

Replace Loading Motor.

Check D851 and POWER circuit.

D. No CASSETTE Loading

YES

E. AUTO STOP in Playback mode

VCR stops automatically in

playback mode.

Check R656,C659 and P601

pin#11.

Check S603, S604 REEL Sensor.

Is D.PG/FG pulse at IC601

pin#90 normal ?

Is C. FG pulse at IC601 pin#87

normal ?

Is there REEL Pulse at IC601

pin#79, 80?

Check and replace IC601.

YES

Check C.FG(R660, C660) and

P601 pin#1.

TROUBLESHOOTING

F. DRUM Motor stops

G. CAPSTAN doesnÕt rotate

CAPSTAN doesnÕt rotate.

Is EVER 13V voltage obtained

at P601 pin#2?

YES

Is Capstan PWM fit to

IC 601 pin#77?

Is 3.2V voltage obtained

at P601 pin#5?

Is 2~3V voltage obtained

at P601 pin#9?

Check P601 Connector and

Capstan Motor.

Check EVER 13V.

(Q854)

Check Capstan FG

(IC 601 pin# 87).

Check R665, R664, R663,

R666, C665.

Check R661, R667, C664.

DRUM Motor stops.

Is 13V voltage obtained at P601

pin#8?

YES

Is DRUM PWM fit to IC 601

pin#76?

Is 1.2V voltage obtained at

P601 pin#12?

Check Capstan Motor and

DRUM Motor.

Check EVER 13V

(D851, Q854).

Check DRUM PG/FG(IC 601 pin# 90).

Check R657, R658,C661,C668.

TROUBLESHOOTING

3. VIDEO circuit

A. EE screen doesnÕt appear

EE MODE Picture NG

Is Video signal input at

IC301 pin#28, 30, 32?

Is 5V supplied at pin#23,

45,52,68 of IC301?

Is C.S, DATA, CLOCK signal input pin#53,54,55 of IC301?

Check IF and LINE IN JACK.

Check POWER circuit.

Check IC601

pin #61, 71, 72.

YES

Is signal output from pin#26 of

IC301?

YES

Check IC301

pin#24 Q-V Sync.

Is signal input into pin#50

of IC601?

YES

Check PCB Pattern.

Is signal output from

pin#52 of IC601?

YES

Is 5V supplied to pin#53, 98,

99 of IC601?

Is signal output at IC302

pin#15?

YES

Check PCB Pattern.

Check IC 601

YES

Check POWER circuit.

Is signal input at IC302

pin#1?

Check RF Output.

LINE out.

YES

Check IC302.

TROUBLESHOOTING

B. Playback picture doesnÕt appear

YES

Is signal output at IC301 pin#14?

Is composite video signal input into

IC301 pin#34?

Is composite video signal output

from IC301 pin#26?

Replace IC301.

PB video signal missing.

Is Envelope output from IC301

pin#14?

YES

Check OSD circuit.

Is 5V supplied at IC301 pin#68?

Is SW Pulse input at IC301

pin#57?

Is 5V obtained at IC301

pin#23,44,45,68?

Check POWER 5V.

Check IC601 pin#18.

Clean head or Replace head.

Check POWER circuit.

YES

Is composite video

signal output from

IC301 pin#39?

Is CLOCK (3.58MHz)

supplied at IC301

pin#41?

YES

Does X301 crystal

(3.58MHz)oscillate?

Replace X301.

Check Q301.

YES

Is C.S, DATA, CLOCK signal input

pin#53,54,55 of IC301?

Check IC601 pin#61,71,72

YES

Is signal input into IC301 pin#22?

Replace IC301.

Is composite video signal output

from IC301 pin#36?

Replace IC301.

YES

TROUBLESHOOTING

Is +5V supplied at IC301 pin#68?

YES

Is VIDEO SW Pulse input at IC301

pin#57?

Is REC signal output from IC301

pin#66,73?

EP MODE: 73 Pin

SP MODE: 66Pin

Check video HEAD and Connector.

Is signal input into IC301

pin# 28,30,32?

Check POWER circuit.

Check IC601 pin#18.

Record video signal poor.

Check EE MODE.

YES

Is luminance and color signal

output from IC301 pin#46, 22?

Replace IC301.

YES

C. No recording

TROUBLESHOOTING

E. No sound in broadcasting (Stereo)

Is 12V obtained at IC251

pin#58?

Is 5V obtained at IC251 pin#40?

YES

Is SIF output from RF101 pin#15

to IC251 pin#48?

Is AUDIO output at IC251

pin#53, 57?

Check Output JACK.

Check POWER circuit.

Check RF101.

Exchange IC251.

Is Video signal input at IC601

pin#50?

Check POWER circuit.

No OSD appears.

Is 5V obtained at IC601 pin# 53,

98, 99?

Is Video signal output at IC601

pin#52?

Replace IC601.

D. No OSD(On Screen Display) appears

YES

Check IC 601.

TROUBLESHOOTING

Check PCB Pattern

Check FFC CABLE & DVD

Module

DVD Composite signal doesnÕt

appear

Is signal output at P101

pin# 7?

Is signal at IC302 pin#2?

F. No DVD Video

YES

Remark previous 3-A

Check Q103, Q104, Q105

Check FFC CABLE &DVD

Module

No COMPONENT signal at

JK102

Is signal output at P101 pin

#13,14,15?

Is signal output at emitter of Q103,

Q104, Q105?

YES

Check Q106, Q107

Check FFC CABLE &DVD

Module

No S-VIDEO signal at JK105

Is signal output at P101

pin #9, 11?

Is signal output at emitter of Q106,

Q107

YES

Is signal at IC302 pin#15?

Check IC302

Check RF output.

YES

Check Line output

TROUBLESHOOTING

4. AUDIO (Hi-Fi MODEL)

No sound in RF E-E mode

Check Output JACK.

A. No sound in E-E mode

A. a.1 RF E-E

Check IC601.

Is Audio signal output at IC251

pin#53, 57?

Are CLK and DATA obtained at

IC251 pin#42,43?

Is 5V obtained at IC251 pin#40?

Is there SIF signal at IC251 pin#48

in RF mode?

Check RF101.

Replace IC251.

YES

Is 12V obtained at IC251 pin#58?

YES

Check POWER circuit.

YES

Is there MUTE(H) at IC251 pin#36?

TROUBLESHOOTING

Check Output JACK.

A. b. LINE1 E-E

YES

Check IC601.

No sound in LINE1 E-E

mode.

Is 12V obtained at IC251 pin#58?

Is 5V obtained at IC251 pin#40?

Check POWER circuit.

YES

Are CLK and DATA obtained at IC251

pin#42,43?

Check Input LINE1 JACK

Replace IC251

YES

Is Audio signal output at IC251

pin#53, 57?

Is Audio signal at IC251 pin#9,

14?

YES

Is there MUTE(H)

at IC251 pin#36?

+ 42 hidden pages

Daewoo DV6T834, DV6T854, DV6T854N, DV6T844N, DV6T864N Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual