Daewoo DTQ-20U4SC Page 59 Service Manual Download

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TROUBLESHOOTING GUIDE

Appendix

2.NO PICTURE

33V

Composite Video

Check
clock/data
signal

#61

#27

#28

#29

SDA

#30

SCL

#10 #11

#12

X701

32.768KHz

ST-BY
5V

Check the crystal

(d)

Check composite video

#61

Check Vsup(+5V)

#58

#17

check Vsup(+3.3V)

Check HOUT

#50

#15

#39

I501

Check RGB Signal OUTPUT #38

#37

Check

200V LINE

Check Vsup(+5V)

#36

D405

T402

FBT

D406

Check
heater voltage

Check clock/data signal

MICOM

check the waveform of I501 #61

I501

VDP3130Y

NG : Go to the figure (c)
OK : Go to the figure (d)

U101
TUNER
CVBS
T-DATA T-CLOCK

I701

Check

the VOLTAGE

Summary of Contents for DTQ-20U4SC

Page 1: ...el DTQ 20U4SC DTQ 2033SC DTQ 27U4SC Mar 2003 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 informati...

Page 2: ...RAM 13 ELECTRICAL PARTS LIST 17 DIFFERENT PARTS LIST 37 EXPLODE VIEW 42 PRINTED CIRCUIT BOARD 45 IC DESCRIPTION 48 WAVEFORMS 54 TROUBLE SHOOTING GUIDE 57 NO POWER 57 NO PICTURE 58 NO SOUND 59 CH DON T...

Page 3: ...COLOR SETS ALWAYS RE INSTALL THEM 3 IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCU RATE AND RELIABLE HIGH VOLTAGE METER THE CALIBRATION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAIN...

Page 4: ...ust be corrected imme diately The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of uninsu lated dangerous voltage that...

Page 5: ...entilation 4 Wall and shelf mounted installations using a commercial mounting kit must follow the factory approved mounting instructions A receiver mounted to a shelf or platform must retain its origi...

Page 6: ...UHF W 12 W 84 Sound Output 3W 3W 5W 5W Speaker 8 ohm 3W x 2EA 8 ohm 7W x 2EA Antenna Input Impedance 75 ohm Unbalanced Auxiliary Input Terminal Front Video Audio L R AV3 Rear Video Audio L R AV1 Video...

Page 7: ...6 CIRCUIT BLOCK DIAGRAM...

Page 8: ...tton to turn the TV s menu system on and off 6 DISPLAY Use this button to display the channel numbeer and status 7 INPUT Use this button to select the TV s signal source 8 VIDEO Use this button to dis...

Page 9: ...the red Press the volume up or down button to enter in the service mode you wish to adjust 2 How to memorize the adjusted values in the service mode Must press DISPLAY button the state which the scree...

Page 10: ...0 0 0 1020 PKINV 0 0 0 1 BLE 1 1 0 1 BTLT 8 0 0 15 BAM 12 9 0 31 SVG1 20 20 0 63 SVD1 7 2 0 7 SVLIM 127 100 0 127 SVDEL 0 7 0 15 OSDBR 130 255 0 511 OSDCO 130 120 0 511 S8 1 RD 700 800 0 1023 GD 700 8...

Page 11: ...al Position Adjustment Select V POSI item adjust V POSI data value to center the raster properly on the screen 2 ASSEMBLY ADJUSTMENTS 1 SCREEN ADJUSTMENT S2 Enter the service mode and select service a...

Page 12: ...t service adjustment data of RD GD BD and RB GB BB until a good gray scale with normal whites is obtained ALIGNMENT INSTRUCTIONS Press the DISPLAY button to memorize the data 5 DIGITAL PRESET D P ADJU...

Page 13: ...ue to obtain normal brightness level Press the DISPLAY button to memorize the data CONTRAST Fixed value 13 TINT Fixed value 200 COLOR Fixed value 100 6 FACTORY OUTGOING MODE S12 FACT If you select the...

Page 14: ...13 SCHEMATIC DIAGRAM 20U4 SHEET 1...

Page 15: ...14 SCHEMATIC DIAGRAM 20U4 SHEET 2...

Page 16: ...15 SCHEMATIC DIAGRAM 27U4 SHEET 1...

Page 17: ...16 SCHEMATIC DIAGRAM 27U4 SHEET 2...

Page 18: ...901 4859636160 CRT A51QDK090X030 P38 24 ZZ200 PTFMSJJ954 MASK FRONT AS DTQ 21U4SC 25 M191 4851948100 BUTTON CTRL AS 4952500 5546800 26 M191A 7178301011 SCREW TAPPTITE TT2 WAS 3X10 MFZN 27 M201 4852081...

Page 19: ...K ASS Y 1K78R05 7174300811 62 00001 1K78R05 IC REGULATOR KIA78R05PI 63 0000A 4857026902 HEAT SINK AL EX BK 64 0000B 7174300811 SCREW TAPPTITE TT2 RND 3X8 MFZN 65 I501 1VDP3130Y IC VDP3130Y 66 I502 1LP...

Page 20: ...ARTZ HC 49 U 20 2500MHZ 30PPM 109 X601 5XE18R432E CRYSTAL QUARTZ HC 49 U 18 43200MHZ 30PPM 110 X701 5XYR03276C CRYSTAL QUARTZ C 001R 32 768000KHZ 20PPM 111 ZZ200 PTMPJ0J954 PCB MAIN RHU AS DTQ 21U4SC...

Page 21: ...EYE LET BSR T0 2 R2 3 152 E027 4856310600 EYE LET BSR T0 2 R2 3 153 E028 4856310600 EYE LET BSR T0 2 R2 3 154 E030 4856310600 EYE LET BSR T0 2 R2 3 155 E031 4856310600 EYE LET BSR T0 2 R2 3 156 E032...

Page 22: ...PIN 199 N401 4857417500 TERM PIN DA IB0214 D2 3 DY PIN 200 N402 4857417500 TERM PIN DA IB0214 D2 3 DY PIN 201 N403 4857417500 TERM PIN DA IB0214 D2 3 DY PIN 202 N404 4857417500 TERM PIN DA IB0214 D2...

Page 23: ...C502 CCXB1H561K C CERA 50V B 560PF K TAPPING 243 C503 CEXF1C470V C ELECTRO 16V RSS 47MF 5X11 TP 244 C507 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP 245 C512 CCXB1H122K C CERA 50V B 1200PF K TAPPING...

Page 24: ...50V RSS 0 33MF 5X11 TP 286 C640 CEXF1H338V C ELECTRO 50V RSS 0 33MF 5X11 TP 287 C643 CEXF1H229V C ELECTRO 50V RSS 2 2MF 5X11 TP 288 C701 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP 289 C703 CEXF1H10...

Page 25: ...K OHM J SMALL 333 SW701 5S50101090 SW TACT THVH472GCA 334 SW702 5S50101090 SW TACT THVH472GCA 335 SW703 5S50101090 SW TACT THVH472GCA 336 SW704 5S50101090 SW TACT THVH472GCA 337 SW705 5S50101090 SW TA...

Page 26: ...F 0 01MF Z 376 C608 CCZF1H103Z C CERA 50V F 0 01MF Z 377 C619 CCZF1H103Z C CERA 50V F 0 01MF Z 378 C622 CCZF1H103Z C CERA 50V F 0 01MF Z 379 C624 CCZF1H103Z C CERA 50V F 0 01MF Z 380 C625 CCZF1H103Z...

Page 27: ...426 J102 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 427 J103 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 428 J104 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 429 J105 85801065GY WIRE COP...

Page 28: ...467 J147 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 468 J149 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 469 J150 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 470 J151 85801065GY WIRE COP...

Page 29: ...512 J213 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 513 J214 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 514 J219 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 515 J222 85801065GY WIRE COP...

Page 30: ...557 J331 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 558 J332 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 559 J335 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 560 J336 85801065GY WIRE COP...

Page 31: ...COATING 601 J817 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 602 J823 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 603 J827 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 604 J857 85801065GY W...

Page 32: ...K OHM J 647 R312 RD AZ133J R CARBON FILM 1 6 13K OHM J 648 R313 RD AZ204J R CARBON FILM 1 6 200K OHM J 649 R314 RD 4Z564J R CARBON FILM 1 4 560K OHM J 650 R315 RD AZ391J R CARBON FILM 1 6 390 OHM J 65...

Page 33: ...ON FILM 1 6 33 OHM J 692 R545 RD AZ330J R CARBON FILM 1 6 33 OHM J 693 R546 RD AZ330J R CARBON FILM 1 6 33 OHM J 694 R547 RD AZ152J R CARBON FILM 1 6 1 5K OHM J 695 R548 RD AZ220J R CARBON FILM 1 6 22...

Page 34: ...FILM 1 6 4 7 OHM J 737 R702 RD AZ103J R CARBON FILM 1 6 10K OHM J 738 R703 RD AZ101J R CARBON FILM 1 6 100 OHM J 739 R704 RD AZ102J R CARBON FILM 1 6 1K OHM J 740 R705 RD AZ472J R CARBON FILM 1 6 4 7...

Page 35: ...6 360 OHM J 782 R795 RD AZ103J R CARBON FILM 1 6 10K OHM J 783 R796 RD AZ102J R CARBON FILM 1 6 1K OHM J 784 R797 RD AZ471J R CARBON FILM 1 6 470 OHM J 785 R798 RD AZ103J R CARBON FILM 1 6 10K OHM J...

Page 36: ...TR KTA1270Y TP 827 ZZ200 PTCPJAJ954 PCB CRT AXIAL AS DTQ 21U4SC 828 A002 4859828813 PCB CRT 108X72 246X246 6 C1B 829 C903 CCZB1H102K C CERA 50V B 1000PF K AXIAL 830 C905 CCZB1H102K C CERA 50V B 1000P...

Page 37: ...30 OHM J 856 R914 RD AZ432J R CARBON FILM 1 6 4 3K OHM J 857 R915 RD 2Z683J R CARBON FILM 1 2 68K OHM J 858 R916 RD AZ751J R CARBON FILM 1 6 750 OHM J 859 R917 RC 2Z102K R CARBON COMP 1 2 1K OHM K 860...

Page 38: ...S606GU 7174300811 27 D801A 4857018902 HEAT SINK A1050P H24 28 D801B 7174300811 SCREW TAPPTITE TT2 RND 3X8 MFZN 29 D904 DLT2A05G DIODE LT2A05G TP 30 J823 RD 4Z100J R CARBON FILM 1 4 10 OHM J 31 L401 58...

Page 39: ...ALL 80 R822 RD AZ223J R CARBON FILM 1 6 22K OHM J 81 R862 RD AZ203J R CARBON FILM 1 6 20K OHM J 82 R863 RD AZ203J R CARBON FILM 1 6 20K OHM J 83 R870 RN AZ1302F R METAL FILM 1 6 13K OHM F 84 R903 RN02...

Page 40: ...1MF 6 3X11 TP 137 C407 CMYH3C752J C MYLAR 1 6KV BUP 7500PF J 138 C413 CCXB2H102K C CERA 500V B 1000PF K TAPPING 139 C416 CCXB2H102K C CERA 500V B 1000PF K TAPPING 140 C417 CCXB2H102K C CERA 500V B 100...

Page 41: ...102 A1 1 0KV TAP 194 J178 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 195 J908 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 196 J910 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING 197 J913 85...

Page 42: ...2 OHM J 242 R940 RD AZ122J R CARBON FILM 1 6 1 2K OHM J 243 R941 RD AZ152J R CARBON FILM 1 6 1 5K OHM J 244 R942 RD AZ683J R CARBON FILM 1 6 68K OHM J 245 R943 RD AZ683J R CARBON FILM 1 6 68K OHM J 24...

Page 43: ...CRT FIXING 2 30X80 BK 9 4856219502 WASHER RUBBER 4 CR T2 0 BLACK 10 4856716000 SPRING 1 SWPA PIE0 5 11 12 13 7121301212 SCREW TAPPING 3 14 7122401412 5 15 7178301011 SCREW TAPPTITE 8 TT2 WAS 3X10 MFZ...

Page 44: ...4856013300 4856013303 WASHER RUBBER 4856219502 7178301011 4851946500 48583014010 4852081900 4855617500 4856717900 4854862100 7178301011 DW 3 EPS TT2 TRS 4X14 MFZN TT2 WAS 3X10 MFZN FR HIPS GY 30X250 Y...

Page 45: ...D 4 4856716000 4854862100 3 2 SPRING 7172401612 SCREW TAPPTITE 15 4858310810 7178301011 7172401212 4856219502 4856015821 4855549100 4854954900 7 6 5 9 8 12 11 10 14 13 SPEAKER SCREW TAPPTITE SCREW TAP...

Page 46: ...45 PRINTED CIRCUIT BOARD CN 230F MAIN...

Page 47: ...46 PRINTED CIRCUIT BOARD CN 230F 20U4 CRT...

Page 48: ...47 PRINTED CIRCUIT BOARD CN 230F 27U4 CRT...

Page 49: ...Spare Vss XT1 XT2 VDD KEY IN AFT IN NC A D RESET FILTER CVBS in VS inv HS inv POWER D G SW A mute V SW MSPRES NC VDPRES ST LED RC IN I O I P I O S VHS SCL1 SDA1 SCL2 SDA2 OSD I OSDblk OSD B OSD G OSD...

Page 50: ...H 22 R OSD RED Signal OUTPUT H O 23 G OSD GREEN Signal OUTPUT H O 24 B OSD BLUE Signal OUTPUT H O 25 BL OSD BLANKING Signal OUTPUT H O 26 I OSD Intensity 27 SDA0 Tuner serial data OUTPUT H O U 28 SCLK...

Page 51: ...VIN4 VIN3 VIN2 VIN1 CIN1 VOUT VSUPAF VRT SGND GNDAF CBIN CIN2 CRIN XTAL2 XTAL1 HOUT CLK20 FBLIN2 BIN2 GIN2 RIN2 FBLIN BIN GIN RIN VRD BOUT GOUT ROUT VSUPAB GNDAB SVMOUT XREF I501 VDP3130Y 1 2 3 4 5 6...

Page 52: ...ort 1 Bit 1 20 P2 IN OUT Port 1 Bit 2 21 P3 IN OUT Port 1 Bit 3 22 P4 IN OUT Port 1 Bit 4 23 P5 IN OUT Port 1 Bit 5 24 P6 IN OUT Port 1 Bit 6 25 GNDD SUPPLY Digital Ground 26 RSW2 OUT Range Switch 2 f...

Page 53: ...ystal Input 52 XTAL2 OUT Analog Crystal Output 53 CIN2 CRIN IN Analog chroma2 component CR Input 54 CBIN IN Component CB Input 55 GNDAF SUPPLY Analog Ground Frontend 56 SGND IN Signal Ground for Analo...

Page 54: ...53 WAVEFORMS 2 T801 PIN17 POWER ON 2 T801 PIN17 STAND BY 0 1 I801 PIN7 POWER ON 1 I801 PIN7 STAND BY 4 T402 PIN1 HOR OUT 3 I501 PIN50 HOUT Appendix...

Page 55: ...54 WAVEFORMS Appendix 5 T402 PIN3 200V LINE 6 T402 PIN9 HEATER LINE 7 T402 PIN4 12V LINE 8 T402 PIN6 27V LINE 9 I501 PIN31 VERTICAL RAMP 10 I501 PIN32 E W...

Page 56: ...55 WAVEFORMS Appendix 11 CVBS Composite Video 12 I501 PIN52 VDP X TAL 13 I501 PIN11 VSYNC 14 SVM Q902 BASE 15 SVM Q906 BASE 16 SVM Q907 BASE...

Page 57: ...56 WAVEFORMS Appendix 17 SVM Q909 BASE 18 I901 PIN7 ROUT...

Page 58: ...PWR on H PWR off L R873 D806 R802 4 5 6 7 8 3 2 1 D871 I803 R868 I804 LTV817 I804 LTV827 I805 LTV817 D811 C891 D804 D802 C892 C807 R805 D810 R892 R891 L802 C809 Check Waveform 8 7 11 10 12V C871 R872...

Page 59: ...stal d Check composite video 61 Check Vsup 5V 58 17 check Vsup 3 3V Check HOUT 50 15 39 I501 Check RGB Signal OUTPUT 38 37 Check 200V LINE Check Vsup 5V 36 D405 T402 FBT D406 Check heater voltage Chec...

Page 60: ...32 768KHz ST BY 5V Check clock data signal Check the crystal f Check Vcc of sound AMP Sound B 14V 3 16 Check audio output signal 1 Speaker L 14 Speaker R Audio input L 6 I602 TDA8944J Audio input R 12...

Page 61: ...omposite Video Signal TUNER CVBS T DATA T CLOCK Check T SDA SCL 27 28 61 29 SDA 4 30 SCL 3 10 11 12 SDA X701 32 768KHz ST BY 5V SCL Check the crystal 5 6 Check SDA SCL 8 ST BY 5V Check the input signa...

Page 62: ...6 58 51 Check the crystal Check the Voltage Check Vout signal Check Vertical signal Vertical D Y Check the Voltage 27V I301 Vcc 27V Check R G B signal X501 X501 Vsup 5V Vsup 5V Vsup 3 3V 61 I501 VDP31...

Page 63: ...I501 VDP3130Y IL701 REMOCON PREAMP I701 MICOM I701 MICOM H SYNC ST BY 5V ST BY 5V ST BY 5V 20 22 23 24 25 41 42 43 44 12 11 10 12 34 11 10 X701 Check the crystal X701 Check the crystal Check OSD R G B...

Page 64: ...PRINTED DATE Mar 2003...

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