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Daewoo DTQ-14U1FS/20U1FS, Service Manual, Page: 26 / 42

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Daewoo DTQ-14U1FS/20U1FS Service Manual Download Page 26

25

TROUBLESHOOTING GUIDE

5. NO COLOR

6. NO VERTICAL DEFLECTION

I101

#44

composite video in

Check

C.V.S waveform

#43

Video/Chroma/Deflection Vcc

Check

the voltage

#38

X502

Check

the crystal

#18

#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

Vertical output

#6

Vertical IC Vcc (25V)

Check

the voltage (25V)

#5

(Invert RAMP in)

#3

C307

(Output)

Check

vertical output signal

Vertical

D.Y.

Check

the waveform

 If no output,
 then change I301

I101

Summary of Contents for DTQ-14U1FS/20U1FS

Page 1: ...merica AC 110V Mexico Chile Peru AC 220V DAEWOO ELECTRONICS CO LTD http svc dwe co kr MUTE POWER CH CH VOL VOL DISPLAY INPUT VIDEO SLEEP PREVIOUS 1 2 3 4 5 6 7 8 0 9 DTQ 14U1FS DTQ 14V5FC DTQ 14V3FC DTQ 20V4FC R 38T01 DTQ 14V1FC 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 ...

Page 2: ... RECEIVERS 3 SPECIFICATIONS 5 BLOCK DIAGRAM 6 ALIGNMENT INSTRUCTIONS 7 SERVICE MODE ADJUSTMENTS 7 ASSEMBLY ADJUSTMENTS 8 IC DESCRIPTION 12 TROUBLE SHOOTING CHARTS 21 NO POWER 21 NO PICTURE 22 NO SOUND 23 CH DON T STOP 24 NO COLOR 25 NO VERTICAL DEFLECTION 25 NO ON SCREEN DISPLY 26 REMOTE CONTROL DOES NOT OPERATE 26 ELECTRICAL PARTS LIST 27 EXPLODED VIEW 32 ...

Page 3: ...E 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 CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND UNDER CERTAIN CIRCUMSTANCES AMY PRODUCE RADIA TION IN EXCESS OF DESIRABLE LEVELS 2 ONLY FACTORY SPECIFIED C R T ANODE CONNECTORS MUST BE U...

Page 4: ...ock 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 uninsu lated dangerous voltage that may be of suffi cienty magnitude to constitute a risk of electric shock The exclamation point within an equilateral tri angle is intended to alert the service personne...

Page 5: ...n 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 or the equivalent thickness in spacers to provide adequate are flow across the bottom bolts or screws used for fasteners must not touch and parts or wiring Perform leakage test on cus tomized installa...

Page 6: ...ynthesizer FS Tuning System TUNING RANGES VHF 2 13 12 UHF 14 69 56 CATV 1 125 125 SOUND OUTPUT 1 3 W 1 3 W 1 3 W 1 3 W SPEAKER 3 W 8 ohm ANTENNA INPUT IMPEDANCE 75 ohm Unbalanced AUXILIARY INPUT TERMINAL Front Video Audio Rear Video Audio INTERMEDIATE FREQUENCIES Picture IF Carrier Frequency 45 75 MHz Sound IF Carrier Frequency 41 25 MHz Color Sub Carrier Frequency 42 17 MHz REMOTE CONTROL R 38T01...

Page 7: ... PLL DEMOD AGC AFT 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 EXT V IN 42 X RAY 34 19 20 21 RED GREEN BLUE 1 2 3 200V CRT 9 8 7 6 I901 TDA6103Q HEATER HOR BUS VCC 25 H V FOCUS SCREEN ABL Hcp 133V VIDEO 200V HEATER 10V 25 5V FBP 28 Q401 HOR DR 27 Q403 HOR ON OFF U COM 37 Q402 HOR OUT B B C C B C 45V I301 LA784...

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 screen is displaying each of service menus after all adjustments are completed each of all service menu Table A Adjust the values of service mode when a part is replaced PART REPLACED ADJUSTMENT NOTE...

Page 9: ...OSI 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 for no received signal Vertical S Correction V SC 0 0 31 Must be set to 6 Vertical Linearity V LIN 20 0 31 Must be set to 16 S7 Internal Black Display internal BLACK pattern Internal 100 White Display...

Page 10: ...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 Horizontal Position Adjustment Select H PHASE item adjust H PHASE data value to obtain proper horizontal centering of the internal cross pattern at the left and right of the screen 4 2 Vertical Position Adjustment...

Page 11: ...own 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 PRESET D P ADJUSTMENTS S9 SUBBRIGHTNESS ADJUSTMENT Receive a good local channel Enter the service mode and select service adjustment S9 You can see the OSD as shoown in below RD 58 GD 10 BD 65 RB 105 GB 160...

Page 12: ...alue 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 S12 then the set becomes factory outgoing status You can see the OSD outgoing OK ...

Page 13: ...D P84 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 BLUE BACK NC AUTO TINT NC KEY IN AFT IN AGC IN SPARE A D M DATA M CLOCK T DATA T CLOCK NC NC NC REMOCON IN ST BY H POWER ON H OUT ON L OFF H SOUND RESET AKB WHITE AUDIO MUTE H NC POWER ON H X T...

Page 14: ...inds 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 Rounding Underline Italic character slanting Attribute can be changed without spacing Vertical display start line number can be set for each row independently Row can be overlapped Horizontal display...

Page 15: ...s 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 Memorize Channels If a channel is broadcasting the channel is memorized Direct Tuning 09KEY Channel Up Down Memorized Channels The Ch Up Down buttons on the Remocon and on the front panel are same functio...

Page 16: ... America 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 Schedule Model Name Pin Option Application Reference CN 001A 1 Input Video TV O Low DC_0V Video High DC_5V TV 2 Reception Air Cable O Low DC_0V Air High DC_5V Cable 3 Audio Mono Stereo O Low DC_0V S...

Page 17: ...16 IC DESCRIPTION 6 Pin Description ...

Page 18: ...17 IC DESCRIPTION ...

Page 19: ...18 IC DESCRIPTION ...

Page 20: ... 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 IF VCC FM FILTER AFT OUTPUT BUS DATA CHROMA AFC1 FILTER VIDEO OUTPUT VIDEO VER BUS GND EX VIDEO INPUT Y IN VIDEO VER VCC INT VIDEO INPUT S C IN BLACK LEVEL DETECTOR VIDEO OUTPUT APC FILTER VCO COIL2...

Page 21: ...I801 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 5 6 10 11 12 13 14 ...

Page 22: ... 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 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 DRAIN OF Q801 ST BY PW ON ...

Page 23: ...14 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 waveform c I101 44 Z501 C525 Check composite video 18 Check RBG Vcc 9V 19 20 21 Check RBG signal output T402 FBT 13 Check ABL current 25 Check HOR BUS Vcc 5V 43 Check CHROMA VER Vcc 5V D405 Check 200V ...

Page 24: ... 28 SDA SCL I101 SF101 SAW FILTER 5 6 10 8 11 12 Check IF Vcc 5V Check clock data signal 3 Check IF AGC voltage e I601 TDA7267A 1 4 f 52 54 Check SIF output signal If no signal then change I101 Check SIF input signal 9 5V Check FM filter circuit Check Vcc of the sound AMP R601 C602 SOUND 12V C603 Audio in Check audio signal in 2 C605 speaker Check audio signal out 3 Q601 Micom 40 Audio MUTE H Mute...

Page 25: ... 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 C103 Check RF AGC Voltage Check AFT window Voltage SF101 SAW FILTER I101 11 12 10 4 RF AGC OUTPUT 49 48 L501 VCO COIL Check VCO coil 2 1V 2 5V ...

Page 26: ... 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 Vertical output 6 Vertical IC Vcc 25V Check the voltage 25V 5 Invert RAMP in 3 C307 Output Check vertical output signal Vertical D Y Check the waveform If no output then change I301 I101 ...

Page 27: ...mote 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 Check the signal 60Hz Check the signal 15 734Hz 23 22 OSD R OSD G OSD B BLANK 15 14 Check OSD R G B BLANK signal If OSD does not operate then change the I701 ...

Page 28: ...C107 CEXF1H228V C ELECTRO 50V RSS 0 22MF 5X11 TP C301 CMXB1H103J C MYLAR 50V EU 0 01MF J TP C302 CEXF1H479V C ELECTRO 50V RSS 4 7MF 5X11 TP C303 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C305 CEXF1H101V C ELECTRO 50V RSS 100MF 8X11 5 TP C307 CXSL2H100D C CERA 500V SL 10PF D TAPPING C308 CMXB1H104J C MYLAR 50V EU 0 1MF J TP C310 CEXF1E102V C ELECTRO 25V RSS 1000MF 13X20 TP C311 CEXD1H229Q C ELECTRO...

Page 29: ...03KCA C CHIP CERA 50V X7R 0 01MF K 2012 CC153 HCBK103KCA C CHIP CERA 50V X7R 0 01MF K 2012 LOC PART CODE PART NAME DESCRIPTION CC154 HCBK103KCA C CHIP CERA 50V X7R 0 01MF K 2012 CC155 HCBK103KCA C CHIP CERA 50V X7R 0 01MF K 2012 CC426 HCBK103KCA C CHIP CERA 50V X7R 0 01MF K 2012 CC528 HCBK102KCA C CHIP CERA 50V X7R 1000PF K 2012 CC551 HCQK101JCA C CHIP CERA 50V CH 100PF J 2012 CC552 HCQK101JCA C C...

Page 30: ...B 9710A JP03 4859109150 JACK PIN BOARD PH JB 9615C LOC PART CODE PART NAME DESCRIPTION L111 58C5580019 COIL CHOKE TRF 9225 0 55UH L112 5CPZ220K02 COIL PEAKING 22UH K AXIAL 3 5MM L501 58N0000042 COIL VCO TRF V008 L502 5CPZ470K04 COIL PEAKING 47UH 10 5MM K LAL04TB L533 5CPZ150K02 COIL PEAKING 15UH K AXIAL 3 5MM L701 5CPZ220K02 COIL PEAKING 22UH K AXIAL 3 5MM L800 58Q0000093 COIL DELAY LINE RS208 L80...

Page 31: ...M 1 4 560 OHM J R820 RD 4Z392J R CARBON FILM 1 4 3 9K OHM J LOC PART CODE PART NAME DESCRIPTION R822 RD 4Z363J R CARBON FILM 1 4 36K OHM J R883 DEC7R0M140 POSISTOR ECPAC7R0M140 R888 RC 2Z565KP R CARBON COMP 1 2 5 6M OHM K R910 RD 2Z152J R CARBON FILM 1 2 1 5K OHM J R911 RD 2Z152J R CARBON FILM 1 2 1 5K OHM J R912 RD 2Z152J R CARBON FILM 1 2 1 5K OHM J R913 RN01B124JS R METAL FILM 1W 120K OHM J SMA...

Page 32: ... 10 3 9K OHM J 2012 RC792 HRFT102JCA R CHIP 1 10 1K OHM J 2012 RC793 HRFT102JCA R CHIP 1 10 1K OHM J 2012 LOC PART CODE PART NAME DESCRIPTION RC794 HRFT102JCA R CHIP 1 10 1K OHM J 2012 RC795 HRFT103JCA R CHIP 1 10 10K OHM J 2012 RC796 HRFT471JCA R CHIP 1 10 470 OHM J 2012 RC797 HRFT103JCA R CHIP 1 10 10K OHM J 2012 RC862 HRFT363JCA R CHIP 1 10 36K OHM J 2012 RC913 HRFT272JCA R CHIP 1 10 2 7K OHM J...

Page 33: ...32 EXPLODED VIEW 1 DTQ 14V1FS ...

Page 34: ...33 EXPLODED VIEW 2 DTQ 14V3FS ...

Page 35: ...34 EXPLODED VIEW 3 DTQ 14V5FC FS ...

Page 36: ...35 EXPLODED VIEW 4 DTQ 14U1FS ...

Page 37: ...36 EXPLODED VIEW 5 DTQ 20V1FS ...

Page 38: ...37 EXPLODED VIEW 6 DTQ 20V3FS ...

Page 39: ...38 EXPLODED VIEW 7 DTQ 20V4FS ...

Page 40: ...39 EXPLODED VIEW 8 DTQ 20U1FS ...

Page 41: ... 1 Mon Aug 09 09 48 04 1999 ...

Page 42: ...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 G7F00E web dwe co kr TEL 82 2 360 8179 8180 8187 FAX 82 2 360 8184 ...

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