Daewoo DDQ-20L6SC Service Manual
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Daewoo DDQ-20L6SC Service Manual

Daewoo DDQ-20L6SC Service Manual

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Service Manual
TV / DVD Combination
CHASSIS : CN-090
Model : DDQ-20L6SC
MODEL
DDQ-20L6
TV STANDARD
NTSC-M
POWER INPUT
AC 120V 60Hz
POWER CONSUMPTION
100W
TUNING RANGES
Frequency Synthesizer(FS) Tuning System
TV
UHF
CATV
VHF(H) : C-W+11
UHF
SOUND OUTPUT
3W + 3W
SPEAKER
8ohm 3W(NORNAL 3W, MAX 5W) x 2EA
ANTENNA INPUT IMPEDANCE
75ohm Unbalanced
AUXILIARY INPUT TERMINAL
REAR PART : S-VHS
SIDE PART : VIDEO, AUDIO(L,R)
AUXILIARY OUTPUT TERMINAL
REAR PART : VIDEO, AUDIO(L,R)
SIDE PART : EARPHONE
INTERMEDIATE FREQUENCIES
PICTURE IF CARRIER FREQUENCY : 45.75MHz
SOUND IF CARRIER FREQUENCY : 41.25MHz
COLOR SUB-CARRIER FREQUENCY : 42.17MHz
REMOTE CONTROL
R-52A01
SPECIAL FUNCTION
1) 3-LANGUAGE
2) WITH CAPTION
3) CH LABEL
4) V-CHIP
5) DYNAMIC SOUND
6) SURROUND
7) WAKE-UP/OFF TIMER
8) SLEEP TIMER
9) POWER RESTORE
10) COAXIAL DIGITAL AUDIO OUT
11) EARPHONE
DAEWOO ELECTRONICE CO., LTD
http://svc.dwe.co.kr
S/M No. : TCN090BEF0
VHF(L) : CH2-CH6
UHF(H) : CH7-CH13
: CH14-CH69
VHF(L) : 5A, A, B, A-5-A-1
CH2-CH6
CH7-CH13
: W+12-W+84
VIDEO, AUDIO(L,R)
COAXIAL DIGITAL AUDIO
July. 2002

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Summary of Contents for Daewoo DDQ-20L6SC

  • Page 1 S/M No. : TCN090BEF0 Service Manual TV / DVD Combination CHASSIS : CN-090 Model : DDQ-20L6SC MODEL DDQ-20L6 TV STANDARD NTSC-M POWER INPUT AC 120V 60Hz POWER CONSUMPTION 100W TUNING RANGES Frequency Synthesizer(FS) Tuning System VHF(L) : CH2-CH6 UHF(H) : CH7-CH13...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1. SAFETY INSTRUCTION ......................... 2. SPECIFICATIONS ........................... 3. CIRCUIT BLOCK DIAGRAM ......................4. ALIGNMENT INSTRUCTIONS ......................4-1 . REMOTE CONTROL(R-52A01) ..................... 4-2 . SERVICE MODE ADJUSTMENTS ..................4-3 . ASSEMBLY ADJUSTMENTS ....................5. SCHEMATIC DIAGRAM ........................10 5-1 .

  • Page 3: Safety Instruction

    1. SAFETY INSTRUCTION PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS CAUTION : Do not attempt to modify this product in any way. Unau- GRAPHIC SYMBOLS : thorized modifications will not only void the warranty, but may lead to The lightning flash with arrowhead symbol,within your being liable for any resulting property damage or user injury.
  • Page 4 PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS SUBJECT : IMPLOSION 4. Wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting instructions. A 1. All direct viewed picture tubes are equipped with an integral implo- receiver mounted to a shelf or platform must retain its original sion protection system, but care should be taken to avoid damage feet(or the equivalent thickness in spacers) to provide adequate...

  • Page 5: Specifications

    2. SPECIFICATION MODEL DDQ-20L6SC STANDARD NTSC-M POWER INPUT AC 120V 60Hz POWER CONSUMPTION 100W TUNING RANGES Frequency Synthesizer(FS) Tuning System VHF(L) : CH2-CH6 UHF(H) : CH7-CH13 : CH14-CH69 CATV VHF(L) : 5A, A, B, A-5-A-1 CH2-CH6 VHF(H) : C-W+11 CH7-CH13...

  • Page 6: Circuit Block Diagram

    3. CIRCUIT BLOCK DIAGRAM...

  • Page 7: Alignment Instructions

    4. ALIGNMENT INSTRUCTIONS 4-1. REMOTE CONTROL (R-52A01) POWER button If you press the ON/OFF button in the front part of this product, power is on. DISPLAY button Operating status and MENU are displayed in a screen. SLEEP button You can set automatic POWER OFF. INPUT button INPUT You can select input mode(TV ->...
  • Page 8 ALIGNMENT INSTRUCTIONS PAUSE/STEP button Pause screen and step screen are displayed while playing and pausing respectively. PLAY button F.R/STEP or F.F/STEP button You can search screen while playing back or forward. OPEN/CLOSE DISC TRAY OPEN/CLOSE button T/C button You move into REPEAT mode whenever you press this button. REPEAT A-B button You can play the given sections repeatedly.

  • Page 9: Service Mode Adjustments

    ALIGNMENT INSTRUCTIONS 4-2. SERVICE MODE ADJUSTMENTS Follow the steps below whenever service adjustment is required. 1) How to enter the service mode using the user remote control -. Turn the set on. -. Direct the remote control to the reception window of TV. -.

  • Page 10: Assembly Adjustments

    ALIGNMENT INSTRUCTIONS 4-3. ASSEMBLY ADJUSTMENTS 1) SCREEN ADJUSTMENT(S2) -. Enter the service mode and select service adjustment S2. -. You can see the one horizontal line on the screen. -. Adjust the Screen Control Volume(located on FBT) so that the horizontal line onscreen may be disappeared. -.

  • Page 11: Schematic Diagram

    5. SCHEMATIC DIAGRAM 5-1 MAIN CIRCUIT DIAGRAM -10-...

  • Page 12: Power Circuit Diagram

    SCHEMATIC DIAGRAM 5-2 POWER CIRCUIT DIAGRAM -11-...

  • Page 13: Exploded View

    K.G.S 7172401612 SCREW TAPPTITE TT2 TRS 4X16 MFZN BK 1+41 DEVELOPMENT DWG SCALE 02/02/26 4857817610 CLOTH BLACK FELT 300X20X0.7 MODEL DDQ-21L6 Daewoo Electronics CO.,LTD. 485009KG 4852161400 COVER BACK FR HIPS GY Mechanical Design Team, TV Research Center REFERENCE CN-090 -12-...

  • Page 14: Electrical Parts List

    7. ELECTRICAL PARTS LIST CAUTION : In this Service 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) LOC PARTS CODE PART NAME...
  • Page 15 ELECTRICAL PARTS LIST LOC PARTS CODE PARTS NAME DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK CC231 HCQK101JCA C CHIP CERA 50V CH 100PF J 2012 RC724 HRFT223JCA R CHIP 1/10 22K OHM J 2012 CC232 HCQK101JCA C CHIP CERA 50V CH 100PF J 2012 RC726 HRFT223JCA R CHIP...
  • Page 16 ELECTRICAL PARTS LIST LOC PARTS CODE PART NAME PART DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK C215 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP C641 CMXM2A103J C MYLAR 100V 0.01MF J (TP) C220 CEXF1C470V C ELECTRO 16V RSS 47MF (5X11) TP C642 CEXF1H229V...
  • Page 17 ELECTRICAL PARTS LIST LOC PARTS CODE PART NAME PART DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK D604 DUZ5R1B--- DIODE ZENER UZ-5.1B R292 RD-4Z111J- R CARBON FILM 1/4 110 OHM J D605 D1N4148--- DIODE 1N4148 (TAPPING) R294 RD-AZ223J- R CARBON FILM 1/6 22K OHM J D614...
  • Page 18 ELECTRICAL PARTS LIST LOC PARTS CODE PART NAME PART DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK R701 RD-AZ182J- R CARBON FILM 1/6 1.8K OHM J R796 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R702 RD-AZ272J- R CARBON FILM 1/6 2.7K OHM J R797 RD-AZ472J-...
  • Page 19 ELECTRICAL PARTS LIST LOC PARTS CODE PART NAME PART DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK L801 5PLF28A2-- FILTER LINE LF-28A2 C893 CEXF1C102V C ELECTRO 16V RSS 1000MF (10X20) TP M231 4852328701 PANEL AV ABS GY 21L6 C894 CEXF1E102V C ELECTRO...
  • Page 20 ELECTRICAL PARTS LIST LOC PARTS CODE PART NAME PART DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK C809 CMXM2A563J C MYLAR 100V 0.056MF J (TP) D815 DUZ6R2BM-- DIODE ZENER UZ-6.2BM C812 CEXF1H229V C ELECTRO 50V RSS 2.2MF (5X11) TP D817 D1N4004S-- DIODE...
  • Page 21 ELECTRICAL PARTS LIST LOC PARTS CODE PART NAME PART DESCRIPTION REMARK LOC PARTS CODE PART NAME PART DESCRIPTION REMARK R830 RD-AZ472J- R CARBON FILM 1/6 4.7K OHM J R914 RD-AZ561J- R CARBON FILM 1/6 560 OHM J R831B RD-2Z470J- R CARBON FILM 1/2 47 OHM J R915 RD-AZ133J-...

  • Page 22: Printed Circuit Board

    7. PRINTED CIRCUIT BOARD 7-1 PCB MAIN -21-...

  • Page 23: Pcb Power

    PRINTED CIRCUIT BOARD 7-2 PCB POWER -22-...

  • Page 24: Ic Description(U-Com : I701)

    9. IC DESCRIPTION(U-COM : I701) 9-1. U-COM (I701) PIN ASSIGN -23-...

  • Page 25: Pin Discription

    Chip(DVD) Select P14/PWM2 DVD-RESET(H) Reset DVD High : DVD Reset, Low : Normal MODE P15/PWM3 EEPROM_WR(H) DEAWOO(H) Remocon Option High : DAEWOO Format, Low : buyer Format P17/PWM TV(H) DVss VSS(-) 32.768 KHz X-TAL OSD OSCILLATE VDD(+) +5V( 10%) P84/AN4...
  • Page 26 IC DESCRIPTION(U-COM : I701) PIN No PIN NAME TYPE DISCRIPTION REMARK P71/INT1 SW-2 Input Select control Signal P72/INT2 SJ ID(H) Check Input Signal in S-VHS JACK /T0IN Active HIGH P73/INT3 REMOCON IN REMOCON CONTROL Signal Input /T0IN SB LED(H) When Stand-by MODE When ON Timer Set When NO V-Sync.(fresh:500mSEC ) Active HIGH...

  • Page 27: Chip Components Position(Pcb Main)

    10. CHIP COMPONENTS POSITION(PCB MAIN) -26-...

  • Page 28: Trouble Shooting Guide

    11. TROUBLE SHOOTING GUIDE TROUBLE SHOOTING GUIDE APPLICATION : DDQ-20L6(CN-090) MENU [A] TV PART (1) NO POWER (2) NO DEGAUSSING OPERATING (3) NO SEARCHING CHANNEL (4) NO INPUTMODE CHANGE (5) NO OSD (6) NO REMOCON OPERATING (7) NO PICTURE (8) VERTICAL DEFLECTION PART (9) PICTURE PART (10) COLOR SIGNAL PART (11) SOUND PART...

  • Page 29: No Power

    TROUBLE SHOOTING GUIDE (1) NO POWER F801(Fuse) CHECK D802 D802 CHKECK/CHANGE CHECK I800 #6-7 ohm test (moreX100Ω) I800 CHANGE Fuse CHANGE I800 #5 Voltage CHECK D802,R821,C804 CHKECK/CHANGE I800 #7 Waveform CHECK R809 CHECK/CHANGE D821 I810 Voltage CHKECK/CHANGE CHECK I701, RLY1 CHECK/CHANGE -28-...

  • Page 30: No Degaussing Operating

    TROUBLE SHOOTING GUIDE (2) NO DEGAUSSING OPERATING Coil Connection CHECK Connection check Q802 Operating CHECK? Q802 relation circuit check/CHANGE R802 CHECK ( 3 ohm ) R802 CHKECK/CHANGE PW501 1701 #41 PIN #5 PIN CHKECK/CHANGE CHECK DIE-GAUSSING COIL CHANGE -29-...

  • Page 31: No Searching Channel

    TROUBLE SHOOTING GUIDE (3) NO SEARCHING CHANNEL Tuner B+ U101 Voltage Voltage CHECK CHECK SDA,SCL SDA, SCL Circuit Operating CHECK CHECK U101 AGC Voltage CHECK Service DATA CHECK Service DATA U101 CHANGE Check/Setup -30-...

  • Page 32: No Inputmode Change

    TROUBLE SHOOTING GUIDE (4) NO INPUTMODE CHANGE I201, I202 B+ Voltage CHECK Voltage CHECK signal circuit INPUT signal CHECK CHECK I201, I202 I201 OUTPUT #3 signal CHECK/CHANGE CHECK U101 (Tuner) I201, I202 Voltage SW CHECK CHECK I701 #31,#32,#37 I501 CHECK/CHANGE CHECK/CHANGE -31-...

  • Page 33: No Osd

    TROUBLE SHOOTING GUIDE (5) NO OSD I701 #22,23, I701 #10,11 Service DATA 24 OUTPUT Oscilation CHECK/CHANGE CHECK CHECK #10,11 relation Circuit CHECK/CHANGE I701 #25 OSD BL circuit OUTPUT CHECK CHECK I501 #14,15, OSD Gain 16,17 INPUT CHECK CHECK -32-...

  • Page 34: No Remocon Operating

    TROUBLE SHOOTING GUIDE (6) NO REMOCON OPERATING REMOCON Battery Battery CHANGE CHECK I704 #1 I704 B+ (#2) OUTPUT CHECK/CHANGE CHECK I701 #34 Relation circuit OUTPUT CHECK waveform CHECK I701 CHECK/CHANGE -33-...

  • Page 35: No Picture

    TROUBLE SHOOTING GUIDE (7) NO PICTURE T402 Operating (7-1) CHECK T402 Voltage CHECK I501 #27 H-DRV relation Q401 waveform waveform check CHECK circuit CHECK I501 I501 #25 Voltage DY CONNECTION CHECK/CHANGE CHECK CHECK Q402 I502 CHECK/CHANGE Relation circuit CHECK (7-1) CHECK/CHANGE D890 relation circuit P902 #1...

  • Page 36: Vertical Deflection Part

    TROUBLE SHOOTING GUIDE (8) VERTICAL DEFLECTION PART I501 #23 I501 #23relation Drive Pulse circuit check CHECK I301 B+ D380 relation circuit Voltage Check CHECK DY Connection CHECK/CHANGE CHECK P801 #5 Pulse C302 waveform check CHECK/CHANGE Q704 relation circuit Q704 waveform CHECK CHECK Relation circuit...

  • Page 37: Picture Part

    TROUBLE SHOOTING GUIDE (9) PICTURE PART NO RF PICTURE I501 #46 #46 relation circuit waveform check CHECK I501 #42 MOVE (4) waveform check (Q207 relation circuit) I701 relation circuit I501 #17 signal CHECK CHECK Q902-Q907 CHECK/CHANGE NO AV PICTURE JP503/PW201 I201 #5,7 signal CHECK CHECK...

  • Page 38: Color Siganl Part

    TROUBLE SHOOTING GUIDE (10) COLOR SIGNAL PART I804 relation circuit I203 #16 I203 B+ waveform check #6 check check/change I502 CHECK/CHANGE #32 relation circuit I501 #32 waveform check CHECK Service data Service Color CHECK/SETUP CHECK I501 CHECK/CHANGE -37-...

  • Page 39: Sound Part

    TROUBLE SHOOTING GUIDE (11) SOUND PART I804 output Level I601 #24,25 I601 #16 signal check Voltage5V check (6V) check I701 I601 #7,8 signal CHECK/CHANGE CHECK I501 I601 #47 SIF CHECK/CHANGE signal check I601 CHECK/CHANGE I602 I602 out signal CHECK/CHANGE #1, 14 check MOVE(9) -38-...

  • Page 40: No Dvd Operating

    TROUBLE SHOOTING GUIDE (12) NO DVD OPERATING NO DVD OPERATING PA890 wire WIRE CHANGE CHECK PW590,591 CABLE Connecntion CHANGE CHECK MODULE MODULE CHANGE CHECK DVD MODULE I202 #7 signal CHANGE CHECK Relation circuit CHECK -39-...

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