DAEWOO ELECTRONICS DTQ-20J5FC Page 31 Service Manual Download

Page: 31 / 36

TROUBLESHOOTING GUIDE

1. NO POWER

12V

#10

I801

D801

PCW1

F801

L801

R801

R416

RLY01

FROM

FBT 10V

C804

T801

B+

133V

45V

12V

D807

C814

D808

D813

C815

C812

R814

C820

C819

TO I101 #34

OCP

TUNER

33V

R820

DR.TRNS B+

45V

SOUND B+

12V

R817

R818

D812

5.6Vz

Q805

C706

ST-BY

133V

Q801

FET

R809

R802

R803

L802

C805

R804

Check

F801(125V 4A)

Check

D801(PBS208GU)

Check

R801(7W 2.2)

Check

Voltage

Check

Voltage

Check

Voltage

Check

Voltage

133V

#14

FROM U-COM
#42 PW ON/0FF

#11

Check

Voltage

FROM MICOM #42
PW ON : H
PW OFF : L

Check

waveform

ST-BY

PW ON

Summary of Contents for DTQ-20J5FC

Page 1: ...C M Sound Output Speaker Antenna Input Impedance Intermediate Frequencies Remote Control Special Function VHF 2 13 12 UHF 14 69 56 CATV 1 125 125 1 3W 1 3W 3W 8 ohm 75 ohm Unbalanced Picture IF Carrie...

Page 2: ...GUIDELINES FOR COLOR TELEVISION RECEIVERS 3 SPECIFICATIONS 5 BLOCK DIAGRAM 6 ALIGNMENT INSTRUCTIONS 7 SERVICE MODE ADJUSTMENTS 7 ASSEMBLY ADJUSTMENTS 8 ELECTRICAL PARTS LIST 12 EXPLODED VIEW 17 IC DE...

Page 3: ...PICTURE TUBE HOWEVER THIS TUBE DOES NOT EMIT X RAYS WHEN THE HIGH VOLT AGE IS AT THE FACTORY SPECIFIED LEVEL THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC OPERATION AT HIGHER VOLT AGES MAY CA...

Page 4: ...ck hazard and must be corrected imme diately GRAPHIC SYMBOLS The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of unin...

Page 5: ...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 original feet o...

Page 6: ...ES VHF 2 13 12 UHF 14 69 56 CATV 1 125 125 SOUND OUTPUT 1 3 W 1 3 W SPEAKER 3 W 8 ohm ANTENNA INPUT IMPEDANCE 75 ohm Unbalanced INTERMEDIATE FREQUENCIES Picture IF Carrier Frequency 45 75 MHz Sound IF...

Page 7: ...FT IF VCC 5V Z501 TRAP 4 5MHz L501 VCO VOIL 49 48 CHROMA LUMINANCE PROCESS HORIZONTAL VERTICAL PROCESS 46 44 ABL 13 VIDEO VER VCC 5V 43 42 X RAY 34 19 20 21 RED GREEN BLUE 1 2 3 200V CRT 9 8 7 6 I901...

Page 8: ...into 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...

Page 9: ...SI 0 63 Align vertical DC bias using internal cross pattern S7 Vertical Size V SIZE 0 127 Align vertical amplitude using internal cross pattern S7 NO SD POWER OFF YES Automatically turn off in 15min f...

Page 10: ...lume up or down button the screen is changing like this Using the volume up or down button select internal cross pattern Select service adjustment S6 You can see the OSD as shown in below 4 1 Horizont...

Page 11: ...ume down adjust 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 6 DIGITAL P...

Page 12: ...lue to obtain normal brightness level Press the DISPLAY button to memorize the data CONTRAST Fixed value 10 TINT Fixed value 27 COLOR Fixed value 15 7 FACTORY OUTGOING MODE S12 FACT If you select the...

Page 13: ...E102M C CERA AC 4 0KV 1000PF E DG I D801 DD2SB80 DIODE BRIDGE D2SB80 F801 5F1GB4021L FUSE GLASS TUBE UL CSA TL 4A 125V MF51 2I I101 1DCT814B IC CHROMA DCT814B 2 I301 PTC2SW4607 HEAT SINK ASS Y 1LA7841...

Page 14: ...HM J 2012 RC151 HRFT104JCA R CHIP 1 10 100K OHM J 2012 RC154 HRFT473JCA R CHIP 1 10 47K OHM J 2012 RC156 HRFT473JCA R CHIP 1 10 47K OHM J 2012 LOC PART CODE PRAT NAME DESCRIPTION REMARK RC165 HRFT472J...

Page 15: ...T222JCA R CHIP 1 10 2 2K OHM J 2012 RC925 HRFT222JCA R CHIP 1 10 2 2K OHM J 2012 RC926 HRFT242JCA R CHIP 1 10 2 4K OHM J 2012 ZZ200 PTMPJ0J702 PCB MAIN RHU AS 9850174600 DTQ 20J5FC C105 CEXF1C471V C E...

Page 16: ...I C806 CCXB3A102K C CERA 1KV B 1000PF K TAPPING C807 CMXB1H103J C MYLAR 50V EU 0 01MF J TP C815 CEXF2A100V C ELECTRO 100V RSS 10MF 6 3X11 TP C818 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP LOC PART...

Page 17: ...TING J045 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J046 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J047 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J048 85801065GY WIRE COPPER AWG22 1...

Page 18: ...2Z220J R CARBON FILM 1 2 22 OHM J LOC PART CODE PRAT NAME DESCRIPTION REMARK R701 RD 4Z240J R CARBON FILM 1 4 24 OHM J R703 RD 4Z102J R CARBON FILM 1 4 1K OHM J R750 RD 4Z472J R CARBON FILM 1 4 4 7K...

Page 19: ...17 EXPLODED VIEW 1 DTQ 20J5FC...

Page 20: ...SCHEMATIC DIAGRAM...

Page 21: ...DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC E mail djkoo web dwe co kr TEL 82 2 360 7806 FAX 82 2 360 7877...

Page 22: ...AN4 P85 AN5 P86 AN6 P87 AN7 RES FILT CVIN VS HS R G B BL I P60 SDA0 P61 SCLK0 P62 SDA1 P63 SCLK1 P70 INT0 P71 INT1 P72 INT2 TOIN P73 INT3 TOIN P00 P01 P02 P03 P04 P05 P06 P07 TV ONLY H CABLE H ST MONO...

Page 23: ...nds of 16 x 32 dot characters used 16K bytes Various characters attributes Character colors 16 colors Character background colors 16 colors Fringe shadow colors 16 colors Full screen colors 16 colors...

Page 24: ...PLL IC Interface FS 181 Channel AIR 2 69CH CABLE 1 125CH AFT Operation Fine Tuning 2 5Fn 2 5MHz AIR CABLE STD HRC IRC Only Cable 5 6CH is that AFT range is cover over broad band 2 5MHzFn 3 5MHz Memori...

Page 25: ...merica ENG SPA POR E2PROM Interface I2C Bus Control CH 6 TRAP Function IS 31 PLL IC Band Data Control Byte 2 P3 P0 VHF L 1 VHF H 2 CH6 TRAP 5 IS 31 AIR Cable CH 6 Only UHF 8 5 The Table of Option and...

Page 26: ...5 IC DESCRIPTION 6 Pin Description...

Page 27: ...6 IC DESCRIPTION...

Page 28: ...7 IC DESCRIPTION...

Page 29: ...RGB VCC RED OUTPUT GREEN OUTPUT BLUE OUTPUT B AKB INPUT VERTICAL OUTPUT RAMP ALC FILTER HOR BUS VCC HOR AFC FILTER HORIZONTAL OUTPUT AUDIO OUT FM OUTPUT PIF AGC RF AGC OUT PIF INPUT1 PIF INPUT2 IF GND...

Page 30: ...01 POWER CONTROL MODULE PIN NO DESCRIPTION PIN NO DESCRIPTION 1 GATE DRIVE1 10 12V INPUT 2 OCP 11 POWER CONTROL 3 SOURCE 12 NC 4 GND1 13 GND2 5 GATE 14 133V INPUT 6 GATE DRIVE2 DPM 001 TI KSE 1 2 3 4...

Page 31: ...I101 34 OCP TUNER 33V R820 DR TRNS B 45V SOUND B 12V R817 R818 D812 5 6Vz Q805 C706 ST BY 5V 133V Q801 FET S R809 R802 G R803 D L802 C805 R804 Check F801 125V 4A Check D801 PBS208GU Check R801 7W 2 2...

Page 32: ...4 AFT 27 28 SDA SCL I101 SF101 SAW FILTER 5 6 10 8 11 12 Check IF Vcc 5V Check clock data signal Check clock data signal 3 4 Check IF AGC voltage Check RF AGC voltage 46 44 Z501 4 5M Trap Check the wa...

Page 33: ...Vcc 5V Check clock data signal 3 Check IF AGC voltage e I601 CXA2104S 16 11 f 52 54 Check SIF output signal If no signal then change I101 Check SIF input signal 9 5V Check FM filter circuit 1 2 audio...

Page 34: ...I701 MICOM 11 12 29 30 T DATA T CLOCK 5V 33V IF OUT 14 AFT 27 28 SDA SCL h AGC IN XC701 32 768KHz 10 ST BY 5V Check the crystal I703 EEPROM 8 ST BY 5V 5 6 SDA SCL Check SDA SCL Check 5V 33V LINE 15 C1...

Page 35: ...19 20 21 RGB Vcc 9V Check the voltage R OUT G OUT B OUT Check R G B signal 43 Video Chroma Deflection Vcc Check the voltage X502 24 C507 C508 V RAMP ALC filter 5V Check the voltage 2 5V I301 LA7841 23...

Page 36: ...ote Control PREAMP ST BY 5V GND 34 OUT Check the waveform I701 MICOM XC701 32 768KHz 10 11 12 ST BY 5V Check the crystal 24 25 SDA SCL I101 16 17 Check clock data signal 20 21 V SYNC IN H SYNC IN Chec...

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