Daewoo DDQ-20L6SC Service Manual Download Page 28 | Manualshive

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11. TROUBLE SHOOTING GUIDE

TROUBLE SHOOTING GUIDE

APPLICATION : DDQ-20L6(CN-090)

MENU

[A] TV PART

[B] DVD 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

(12) NO DVD OPERATING

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Summary of Contents for DDQ-20L6SC

Page 1: ... 3W 3W SPEAKER 8ohm 3W NORNAL 3W MAX 5W x 2EA ANTENNA INPUT IMPEDANCE 75ohm Unbalanced AUXILIARY INPUT TERMINAL REAR PART S VHS VIDEO AUDIO L R SIDE PART VIDEO AUDIO L R AUXILIARY OUTPUT TERMINAL REAR PART VIDEO AUDIO L R COAXIAL DIGITAL AUDIO SIDE PART EARPHONE INTERMEDIATE FREQUENCIES PICTURE IF CARRIER FREQUENCY 45 75MHz SOUND IF CARRIER FREQUENCY 41 25MHz COLOR SUB CARRIER FREQUENCY 42 17MHz R...

Page 2: ...ICAL PARTS LIST 13 8 PRINTED CIRCUIT BOARD 21 8 1 PCB MAIN 21 8 2 PCB POWER 22 9 IC DESCRIPTION U COM I701 23 9 1 U COM I701 PIN ASSIGN 23 9 2 PIN DISCRIPTION 24 10 CHIP COMPONENTS POSITION PCB MAIN 25 11 TROUBLE SHOOTING GUIDE 26 A TV PART 1 NO POWER 28 2 NO DEGAUSSING OPERATING 29 3 NO SEARCHING CHANNEL 30 4 NO INPUTMODE CHANGE 31 5 NO OSD 32 6 NO REMOCON OPERATING 33 7 NO PICTURE 34 8 VERTICAL ...

Page 3: ... 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 personnelto the pr...

Page 4: ...lations 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 installations 5 Caution customers against...

Page 5: ... IMPEDANCE 75ohm Unbalanced AUXILIARY INPUT TERMINAL REAR PART S VHS VIDEO AUDIO L R SIDE PART VIDEO AUDIO L R AUXILIARY OUTPUT TERMINAL REAR PART VIDEO AUDIO L R COAXIAL DIGITAL AUDIO 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 ...

Page 6: ... 0 5V for Micom 125V 33V 13V for SW Chroma Comb F Tuner for FBT M M M M S S S S P P P P 3 3 3 3 4 4 4 4 2 2 2 2 0 0 0 0 T T T T U U U U N N N N E E E E R R R R IIC2 MPX IIC2 IF OUT IIC2 Y cb cr Y C V D H D CVBS R G B C C C C h h h h r r r r o o o o m m m m a a a a I I I I F F F F L L L L A A A A 7 7 7 7 6 6 6 6 8 8 8 8 3 3 3 3 7 7 7 7 IIC2 SW ID RESE CVBS M M M M i i i i c c c c r r r r o o o o p ...

Page 7: ...ton You can select the desired audio language 3D button You can select NORM or 3D surround VOLUME button TV MENU button CURSOR CHANNEL SELECT button This button functions as cursor or channel select button in setting TV DVD and operating TV respectively MUTE button Press this button if you only want to turn off the sound ENTER button Press this button if DVD setting is completed MENU PBC button Th...

Page 8: ...s this button A B button You can play the given sections repeatedly SETUP button You can set the DVD player CLEAR button You can clear settings TITLE button You can select the desired title SUBTITLE button You can select the desired subtitle language Angle button You can select the desired screen angle ZOOM button You can zoom in a screen RANDOM button You can play and CD randomly PROGRAM button Y...

Page 9: ... Then the screen will appear as follows S2 SCRN S5 IFC S6 GEO S8 W B S9 DP S12 FACT S7 PTRN Using the channel up or down button select the item you wish to adjust The color of selected item turns into the red Press 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 ...

Page 10: ...ment Select H CENTER item adjust H CENTER 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 Select V CENTER item adjust V CENTER data value to center the raster properly on the screen 4 3 Vertical Size Adjustment Select V SIZE item adjust V SIZE data value to proper vertical size Press the DISPLAY but...

Page 11: ...5 SCHEMATIC DIAGRAM 10 5 1 MAIN CIRCUIT DIAGRAM ...

Page 12: ...SCHEMATIC DIAGRAM 11 5 2 POWER CIRCUIT DIAGRAM ...

Page 13: ...PPTITE 7174301011 4857028210 1 1 TT2 RND 3X10 MFZN AL EX BRKT EARTH DOOR CD AS 4851948500 4853953700 C5212P 1 2M T0 2 2823401 5800018 1 2 TT2 WAS 3X8 MFZN 4 SCREW TAPPTITE 7178300811 4857249200 SHIELD BOTTOM ET T0 4 1 DVD AS 1 4857249100 SHIELD CASE SECC T0 5 1 TT2 WAS 3X12 MFZN BK 4 SCREW TAPPTITE 7178301212 FRAME POWER 4853818500 1 FR HIPS BK POWER PCB 246X197Xt1 6 1 HOLDER AC CORD 4853535500 1 ...

Page 14: ...83P IC COMBFILTER TDA9183P I501 1LA76837 IC LA76837 I502 1K78R05 IC REGULATOR KIA78R05PI I601 1MSP3420B8 IC SOUND PROCESSOR MSP3420G P0 B8 I602 PTG2SW8210 HEAT SINK ASS Y 1TDA8944J 7174300811 00001 1TDA8944J IC SOUND TDA8944J 0000A 4857028210 HEAT SINK AL EX 0000B 7174300811 SCREW TAPPTITE TT2 RND 3X8 MFZN I702 1CAT24C16P IC MEMORY CAT24WC16P I704 1SRV21M IC PREAMP SRV 21M JP502 4859106440 JACK S ...

Page 15: ...2 RC534 HRFT750JCA R CHIP 1 10 75 OHM J 2012 RC630 HRFT681JCA R CHIP 1 10 680 OHM J 2012 RC635 HRFT202JCA R CHIP 1 10 2K OHM J 2012 RC722 HRFT223JCA R CHIP 1 10 22K OHM J 2012 LOC PARTS CODE PART NAME PART DESCRIPTION REMARK RC724 HRFT223JCA R CHIP 1 10 22K OHM J 2012 RC726 HRFT223JCA R CHIP 1 10 22K OHM J 2012 RC728 HRFT223JCA R CHIP 1 10 22K OHM J 2012 RC730 HRFT223JCA R CHIP 1 10 22K OHM J 2012...

Page 16: ...00V C ELECTRO 50V RSS 10MF 5X11 TP C633 CMXM2A224J C MYLAR 100V 0 22MF J C634 CMXM2A224J C MYLAR 100V 0 22MF J C635 CMXM2A152J C MYLAR 100V 1500PF J TP C636 CMXM2A104J C MYLAR 100V 0 1MF J TP C638 CMXM2A152J C MYLAR 100V 1500PF J TP C639 CEXF1H470V C ELECTRO 50V RSS 47MF 6 3X11 TP C640 CMXM2A103J C MYLAR 100V 0 01MF J TP LOC PARTS CODE PART NAME PART DESCRIPTION REMARK C641 CMXM2A103J C MYLAR 100V...

Page 17: ... FILM 1 4 75 OHM J R287 RD AZ102J R CARBON FILM 1 6 1K OHM J R290 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING R291 RD 4Z750J R CARBON FILM 1 4 75 OHM J LOC PARTS CODE PART NAME PART DESCRIPTION REMARK R292 RD 4Z111J R CARBON FILM 1 4 110 OHM J R294 RD AZ223J R CARBON FILM 1 6 22K OHM J R297 RD AZ102J R CARBON FILM 1 6 1K OHM J R298 RD AZ473J R CARBON FILM 1 6 47K OHM J R299 RD AZ473J R CARBON ...

Page 18: ... R CARBON FILM 1 6 4 7K OHM J R792 RD AZ471J R CARBON FILM 1 6 470 OHM J R795 RD AZ103J R CARBON FILM 1 6 10K OHM J LOC PARTS CODE PART NAME PART DESCRIPTION REMARK R796 RD AZ103J R CARBON FILM 1 6 10K OHM J R797 RD AZ472J R CARBON FILM 1 6 4 7K OHM J ZZ300 PTPWMSJ957 PCB POWER MANUAL AS DDQ 21L6FC 10 2193102005 SOLDER BAR SN PB 63 47 S63S 1320 30 2291050616 FLUX SOLDER JS 64T3 40 2291050301 FLUX ...

Page 19: ... 22MF 10X20 TP LOC PARTS CODE PART NAME PART DESCRIPTION REMARK C893 CEXF1C102V C ELECTRO 16V RSS 1000MF 10X20 TP C894 CEXF1E102V C ELECTRO 25V RSS 1000MF 13X20 TP ZZ200 PTPWJBJ957 PCB POWER M 10 AS DDQ 21L6FC 10 2TM18006BE TAPE MASKING 6 2X500 N401 4857417500 TERM PIN DA IB0214 D2 3 DY PIN N402 4857417500 TERM PIN DA IB0214 D2 3 DY PIN N403 4857417500 TERM PIN DA IB0214 D2 3 DY PIN N404 485741750...

Page 20: ...PING D401 DRGP15J DIODE RGP15J D803 DRGP15J DIODE RGP15J D807 DRGP15J DIODE RGP15J D814 D1N4148 DIODE 1N4148 TAPPING LOC PARTS CODE PART NAME PART DESCRIPTION REMARK D815 DUZ6R2BM DIODE ZENER UZ 6 2BM D817 D1N4004S DIODE 1N4004S D819 D1N4148 DIODE 1N4148 TAPPING D822 DRGP15J DIODE RGP15J D823 DRGP15J DIODE RGP15J D824 DRGP15J DIODE RGP15J D826 DRGP15J DIODE RGP15J D827 D1N4004S DIODE 1N4004S D828 ...

Page 21: ... TIN COATING R907 RC 2Z272K R CARBON COMP 1 2 2 7K OHM K R908 RC 2Z272K R CARBON COMP 1 2 2 7K OHM K R909 RC 2Z272K R CARBON COMP 1 2 2 7K OHM K R911 RD AZ471J R CARBON FILM 1 6 470 OHM J R912 RD AZ471J R CARBON FILM 1 6 470 OHM J R913 RD AZ471J R CARBON FILM 1 6 470 OHM J R914 RD AZ561J R CARBON FILM 1 6 560 OHM J R915 RD AZ133J R CARBON FILM 1 6 13K OHM J R916 RD AZ122J R CARBON FILM 1 6 1 2K OH...

Page 22: ...7 PRINTED CIRCUIT BOARD 21 7 1 PCB MAIN ...

Page 23: ...PRINTED CIRCUIT BOARD 22 7 2 PCB POWER ...

Page 24: ... 23 9 IC DESCRIPTION U COM I701 9 1 U COM I701 PIN ASSIGN ...

Page 25: ...TPUT VOLATGE FROM LA76835 8Bit A D DC 0 Vdd 16 P87 AN7 AFT IN I AFT CONTROL OUTPUT VOLATGE FROM LA76835 8Bit A D DC 0 Vdd Center 2 5V 17 RES RESET L I SYSTEM Reset Hardware Reset INPUT ACTIVE Low 18 FILT FILTER I O Filter terminal for PLL 19 CVIN CVIN IN I Video signal input terminal for CAPTION 1Vpp In 20 VS V Sync L I OSD VERTICAL SIGNAL INPUT DC 0 5V Pulse Active Low 21 HS H Sync L I OSD HORIZO...

Page 26: ...5 P00 SB LED H O When Stand by MODE When ON Timer Set When NO V Sync fresh 500mSEC Active HIGH 36 P01 DVD LED H O When DVD Play ON When NO V Sync Ω ON fresh 500mSEC Active HIGH 37 P02 SW 3 O Input Select control Signal 38 P03 MSP RESET H O Reset MSP3420GB8 Active HIGH 39 P04 H OUT H O I502 ON OFF SW Active HIGH 40 P05 A MUTE H O I601 3 ON OFF SW Active HIGH 41 P06 DG ON H O Degaussing ON OFF SW Ac...

Page 27: ... 26 10 CHIP COMPONENTS POSITION PCB MAIN ...

Page 28: ... DDQ 20L6 CN 090 MENU A TV PART B DVD 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 12 NO DVD OPERATING ...

Page 29: ...0 6 7 ohm test moreX100Ω I800 5 Voltage CHECK I800 7 Waveform CHECK D821 Voltage CHECK F801 Fuse CHECK N Y N N N Y Y Y Y Y D802 CHKECK CHANGE D802 R821 C804 CHKECK CHANGE I810 CHKECK CHANGE I701 RLY1 CHECK CHANGE R809 CHECK CHANGE I800 CHANGE Fuse CHANGE ...

Page 30: ...EGAUSSING OPERATING Coil Connection CHECK PW501 5 PIN CHECK N N Y Y Connection check 1701 41 PIN CHKECK CHANGE DIE GAUSSING COIL CHANGE Q802 Operating CHECK N Y Q802 relation circuit check CHANGE R802 CHECK 3 ohm N Y R802 CHKECK CHANGE ...

Page 31: ...OOTING GUIDE 3 NO SEARCHING CHANNEL U101 Voltage CHECK N Y Tuner B Voltage CHECK U101 CHANGE Service DATA Check Setup SDA SCL Operating CHECK N Y SDA SCL Circuit CHECK U101 AGC Voltage CHECK Service DATA CHECK N N Y ...

Page 32: ... CHANGE I201 I202 Voltage CHECK N Y B Voltage CHECK I501 CHECK CHANGE I701 31 32 37 CHECK CHANGE INPUT signal CHECK N Y signal circuit CHECK I201 OUTPUT 3 signal CHECK N Y I201 I202 CHECK CHANGE U101 Tuner Voltage CHECK I201 I202 SW CHECK N Y ...

Page 33: ...E 5 NO OSD Service DATA CHECK CHANGE 10 11 relation Circuit CHECK CHANGE OSD BL circuit CHECK I701 22 23 24 OUTPUT CHECK I701 25 OUTPUT CHECK I701 10 11 Oscilation CHECK N N Y Y Y N OSD Gain CHECK I501 14 15 16 17 INPUT CHECK N ...

Page 34: ...ROUBLE SHOOTING GUIDE 6 NO REMOCON OPERATING Battery CHANGE REMOCON Battery CHECK Y Y Y N I704 B 2 CHECK CHANGE I704 1 OUTPUT CHECK N Relation circuit CHECK I701 CHECK CHANGE I701 34 OUTPUT waveform CHECK N ...

Page 35: ...ge CHECK Y Y Y N Q401 waveform CHECK I501 27 waveform check Y N N I501 CHECK CHANGE I502 Relation circuit CHECK Q402 CHECK CHANGE I501 25 Voltage CHECK N D890 relation circuit CHECK P902 1 Voltage check Y I501 32 Voltage CHECK SCT1 CRT CHECK CHANGE P902 4 waveform check Y N N DY CHECK CHANGE DY CONNECTION CHECK Y N ...

Page 36: ...501 23 Drive Pulse CHECK Y D380 relation circuit CHECK N I301 B Voltage Check Y DY CHECK CHANGE N DY Connection CHECK Y C302 CHECK CHANGE N P801 5 Pulse waveform check Y Q704 relation circuit CHECK N Q704 waveform CHECK Y Relation circuit CHECK N I701 20 waveform CHECK Y I701 CHECK CHANGE ...

Page 37: ...URE 46 relation circuit CHECK N I501 46 waveform check Y JP503 PW201 CHECK N I201 5 7 signal CHECK MOVE 4 Y MOVE 4 Q207 relation circuit N I501 42 waveform check Y I701 relation circuit CHECK N I501 17 signal CHECK Y Q902 Q907 CHECK CHANGE NO AV PICTURE ...

Page 38: ...LOR SIGNAL PART I804 relation circuit check change I502 CHECK CHANGE 32 relation circuit CHECK N I203 16 waveform check Y N I501 32 waveform check Y Service data CHECK SETUP I501 CHECK CHANGE N Service Color CHECK Y N I203 B 6 check Y ...

Page 39: ...04 output Level 6V check N I601 24 25 signal check Y I602 CHECK CHANGE I601 CHECK CHANGE N I602 out signal 1 14 check Y MOVE 9 N I601 16 Voltage5V check Y I701 CHECK CHANGE N I601 7 8 signal CHECK Y I501 CHECK CHANGE N I601 47 SIF signal check Y ...

Page 40: ... GUIDE 12 NO DVD OPERATING WIRE CHANGE NO DVD OPERATING Relation circuit CHECK N PA890 wire CHECK Y CABLE CHANGE N PW590 591 Connecntion CHECK Y MODULE CHANGE N DVD MODULE CHECK Y DVD MODULE CHANGE N I202 7 signal CHECK Y ...

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