LG T910B Service Manual Download Page 20 | Manualshive

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CHECK

SCREEN CONTROL

KNOB OF FBT

CHECK

VOLTAGE AT

D924 CATHODE (80V)

IC902-1 (12V)

D921 CATHODE

(6.3V)?

CHECK

IC401 (MICOM) PIN 16

5V (HIGH)

CHECK

POWER INDICATOR

GREEN or AMBER ?

- 20 -

3. NO RASTER

AMBER

NO

NO

NO

TROUBLE IN

IC401 (MICOM),

TROUBLE IN
P302 SIGNAL CABLE

ROTATE SCREEN CONTROL
KNOB TO CLOCKWISE
or COUNTER CLOCKWIES

TROUBLE IN PRIMARY
CIRCUIT OF T901

TROUBLE IN
PRIMARY CIRCUIT OF T901

GREEN

YES

YES

YES

NO VIDEO

(POWER INDICATOR

GREEN or AMBER)

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Summary of Contents for T910B

Page 1: ...service com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MENU SELECT Brightview MODEL T910B T910BM KL E CHASSIS NO CA 137 Same model for Service Same looking with new chassis ...

Page 2: ...2EFER TO THE 4IMING HART 3IGNAL ONNECTOR 0IN 3UB ONNECTOR 3CANNING REQUENCY ORIZONTAL K Z 6ERTICAL Z 32 5 6833 0OWER 2ANGE 6 AX 6 Z AX 0 VERSION 0OWER ONSUMPTION 63 5 CTIVE 6IDEO REA s AX MAGE 3IZE 8 X MM X s 0RESET MAGE 3IZE X MM X ISPLAY OLOR ULL OLORS ISPLAY 2ESOLUTION OTS X INES Z 6IDEO ANDWIDTH Z 19 5210 17 PERATING 4EMPERATURE MBIENT 2ELATIVE UMIDITY ON CONDENSING LTITUDE Less than M domesti...

Page 3: ... joints frayed leads damaged insulation solder splashes or the sharp points Be sure to remove all foreign materials IMPLOSION PROTECTION All used display tubes are equipped with an integral implosion protection system but care should be taken to avoid damage and scratching during installation Use only same type display tubes X RADIATION The only potential source of X radiation is the picture tube ...

Page 4: ...st receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices ...

Page 5: ...tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coati...

Page 6: ...onnection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on t...

Page 7: ... 015 0 044 0 523 1024 X 768 85Hz Yes MODE 4 91 146 10 971 8 127 2 844 0 406 1 016 1 422 85 024 11 762 11 235 0 527 0 011 0 033 0 483 1280 X 1024 85Hz Yes Yes MODE 5 93 750 10 666 7 901 2 765 0 316 0 948 1 501 75 000 13 333 12 800 0 533 0 011 0 032 0 490 1600 X 1200 75Hz MARK A B C D E F A B C D E F MODE FACTORY PRESET MODE Resolution Recall H O R I Z O N T A L V E R T I C A L Sync Polarity Frequen...

Page 8: ...ss hatch pattern at Mode 4 2 Adjust P907 voltage to 50V 0 2V with VR901 2 Adjustment for High Voltage 1 Display cross hatch pattern at Mode 4 2 Adjust CDT Anode voltage to 27kV 0 2kV with I P in Hot key mode 3 Adjustment for Horizontal Raster Center 1 Display cross hatch pattern at Mode 4 2 Adjust the Back Raster should be center of the screen with SW801 2 Adjustment by Service Hot key How to ente...

Page 9: ...0 0 Contrast Maximum Brightness Maximum Color temperature 9300K 11 1 Adjustment of cut off Adjustment of back raster 11 1 a Before adjustment press Menu and Degauss to remove Enter hot key mode Adjust Brightness and Contrast to Max in OSD window 1 Adjust cut off back raster first Enter DEGAUSS in the Menu and modify the following data Modify RCUT to Min 0 Modify GCUT To Min 0 Adjust to BCUT Data 1...

Page 10: ... east Scanning Frequency 1280 x 1024 85Hz 91kHz 85Hz Display image White flat field Luminance Cut off point at the center of the display area Note Color purity adjustments should only be attempted by qualified personnel PROCEDURE For trained and experienced service technicians only Use the following procedure to correct minor color purity problems 1 Make sure the display is not affected by externa...

Page 11: ...eat above from number 6 to 16 20 COMMAND PRESET EXIT Y Yes command 2 Adjustment for White Balance and Luminance 1 Set the White Balance Meter 2 Press the DEGAUSSING on the OSD menu for demagnetization of the CDT 3 Display color 0 0 pattern at Mode 4 4 COMMAND PRESET START Y Yes command 5 Set Bightness and Contrast to max position 6 COLOR ADJ LUMINANCE command of the alignment program 7 COLOR ADJ B...

Page 12: ...itor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Update button c Click Write button Adjustment and EDID Data Down in GCSC ...

Page 13: ...0 cross hatch pattern at Mode 4 3 Use EDIT MODEL SEL command to select the right model info file 4 Use EDIT EDID INFO command and return to read the EDID Data 5 Modify the EDID Data if needed and using F10 to save the change and exit 2WriteEDIDData 1 Display color 15 0 cross hatch pattern at Mode 4 2 Use EEPROM Write EDID command and confirm EDIDWrite OK message of monitor 3 Exit from the alignmen...

Page 14: ...WIRING DIAGRAM 14 P301 P302 P303 Signal Cable AC Socket T B F P701 S S P901 P702 P551 P401 P201 P402 ...

Page 15: ...ic FOCUS Circuit Brightness Control 160V 40V 15V D D Feed Back 12V SCL SDA H Sync V Sync PWM Control Signal 15V 50V DY CDT Heater HT I 2 C Screen H V R G B Bias H Drive B Drive B 15V DPM Control Circuit 5V 6 3V 12V 80V Voltage feedback Degaussing Coil Dynamic Focus Static Focus TILT Coil 50V 80V 5V G2 G1 Auto Beam Limit DC DC Converter FBT T701 Regulation Circuit 15V SMPS T901 5V BRIGHTNESS CONTR ...

Page 16: ...d outputs horizontal and vertical drive signal to control screen distortions 5 D D Converter Circuit To obtain constant high voltage this circuit supplies controlled DC voltage for FBT and horizontal deflection circuit according to the horizontal sync frequency 6 X RAY Protection Circuit When the high Voltage reaches to 30kV in an abnormal case the high voltage detector circuit R818 D721 C739 R416...

Page 17: ...beams red green and blue beam are shifted finely thus reducing interference 15 Video Processor Circuit Video processor circuit consists of the video drive output block The video drive IC IC302 receives the video signal from PC The gain of each channel is controlled by MICOM through IIC The cut off circuit compensate different voltage of each channel between the cathode and the G1 of the CDT 16 Vid...

Page 18: ... F901 18 TROUBLESHOOTING GUIDE 1 NO POWER NO POWER POWER INDICATOR OFF NO NO NO NO TROUBLE IN Q912 Q914 Q941 Q951 IC902 IC903 TROUBLE IN FUSE F901 SMPS Switch ON OFF TROUBLE IN BRIDGE DIODE D901 TROUBLE IN IC901 Q901 TROUBLE IN D924 D923 D922 D921 D920 YES YES YES YES 2 1 CHECK Q905 OK NO TROUBLE IN Q905 YES 1 2 Waveforms Q901 Drain IC901 6 ...

Page 19: ... P302 TROUBLE IN IC303 TROUBLE IN IC304 YES YES YES YES 19 CHECK IC302 5 6 7 Pin CHECK IC302 1 19 20 21 23 24 PIN 10 5V CHECK IC303 PIN 1 3 5 PIN8 12V PIN 4 80V CHECK R G B CATHODE VOLTAGE Waveforms 12 7 10 11 12 13 10 11 13 Waveforms IC302 5 6 7 IC302 23 IC302 19 20 21 IC302 1 IC302 24 CDT RK GK BK 26 27 IC302 23 7 6 7 ...

Page 20: ... 16 5V HIGH CHECK POWER INDICATOR GREEN or AMBER 20 3 NO RASTER AMBER NO NO NO TROUBLE IN IC401 MICOM TROUBLE IN P302 SIGNAL CABLE ROTATE SCREEN CONTROL KNOB TO CLOCKWISE or COUNTER CLOCKWIES TROUBLE IN PRIMARY CIRCUIT OF T901 TROUBLE IN PRIMARY CIRCUIT OF T901 GREEN YES YES YES NO VIDEO POWER INDICATOR GREEN or AMBER ...

Page 21: ...WAVE CHECK IC601 Pin 3 15V 21 4 NO VERTICAL DEFLECTION NO V DEFLECTION ONE HORIZONTAL LINE NO NO NO TROUBLE IN IC601 V CIRCUIT TROUBLE IN T901 15V Line Waveforms TROUBLE IN T701 40V line TROUBLE IN IC401 OR R444 R445 YES YES YES IC601 1 IC601 2 9 8 8 9 ...

Page 22: ...NPUT H V SYNC SIGNAL NO NO NO TROUBLE IN T901 or PC CHECK PC PC IS NOT GOING INTO DPM MODE TROUBLE IN X401 TROUBLE IN IC401 TROUBLE IN IC401 NO TROUBLE IN Q912 Q914 NO H V SYNC SIGNAL YES YES YES YES DPMS TABLE NORMAR ON ON NORMAL GREEN STAND BY OFF ON OFF 0V AMBER SUSPEND ON OFF OFF 0V AMBER OFF OFF OFF OFF 0V AMBER H V SYNC VIDEO LED MODE ITEM IC401 45 46 CHECK IC401 PIN 16 5V HIGH 3 Waveforms ...

Page 23: ...VOLTAGE 0 5V CHECK P902 CHECK RL901 CHECK IC401 PIN 4 5V 6 NO DEGAUSSING NO DEGAUSSING NO NO NO NO TROUBLE IN TH901 DEGAUSSING COIL TROUBLE IN IC401 MICOM TROUBLE IN D952 TROUBLE IN P902 TROUBLE IN RL901 YES YES YES YES 23 ...

Page 24: ... LINE 2 Replace Q720 Replace Q719 Check and Replace Q705 Check and replace Q706 R730 R734 and D709 Check DY connector connection YES YES YES 17 IC401 18 Q706 Base Q706 Collector Q719 Drain Q705 Drain 5 17 18 16 15 Waveforms 8 Invariable H_Size NO Check and replace IC401 Check if DC voltage of IC401 PIN 35 wave is Variable Q720 Collector 5 IC401 Pin 18 waveform is right NO Replace IC401 YES 4 ...

Page 25: ...737 Q721 Q711 Q713 Q714 Q717 YES YES YES 10 H_Lin Failure NO Replace IC401 Check L703 NO Check 15 V line Check some parts around Q821 Cs SIGNAL TABLE CS1 CS2 CS3 CS4 29 Hf 34kHZ L L L L 34 Hf 39kHZ L H H L 39 Hf 44kHZ H L L L 44 Hf 49kHZ H L L L 49 Hf 52kHZ H L H L 52 Hf 58kHZ H L H L 58 Hf 62kHZ H L H H 62 Hf 66kHZ H L H H 66 Hf 71kHZ H H H L 71 Hf 76kHZ H H H L 76 Hf 81kHZ H H H L 81 Hf 84kHZ H ...

Page 26: ...form IC401 pin35 Variable 26 11 Side Pin or Trap Para Pin Banlance Failure NO Replace IC401 Q703 Drain 19 19 Waveforms Check Q703 Collection waveform variable YES YES Replace R727 or C719 NO Check Q703 and 12V line ...

Page 27: ...ent DAC values 12 Tilt Failure Check tilt connector connection Check and replace CRT NO NO Check and replace IC401 Check and replace Q551 YES YES 13 V Size or Pos Variation Failure Check and replace IC601 NO Check some parts around IC401 YES 27 IC401 33 IC401 34 Waveforms Q552 Q553 emit values NO Check and replace Q552 Q553 YES ...

Page 28: ...1 R803 YES YES 28 IC401 Pin5 input exists and varies When adjust ABL IC302 22 Pin Voltage varies NO Check Q787 and around 14 Check FBT DF Voltage IC401 Pin 24 4 6V DC output are right 15 Focus Failure NO NO Check the connection between FBT and CRT Socket PCB Check and replace IC401 Waveforms Check FBT and around component YES YES FBT FO 14 ...

Page 29: ...values are right IC401 Pin 45 and 46 inputs are right IC401 Pin 16 input is over 4 2V 16 Micom Failure 17 OSD Failure NO NO NO NO Done Change IC302 Check IC903 Check X401 Check and replace R451 C408 Replace IC401 YES YES YES YES 29 IC401 45 46 Waveforms ...

Page 30: ...eplace IC401 Check and replace function key YES 19 Missing Color NO Done Change the CRT Check signal generator and signal cable NO Refer to 2 No Charcter NO Check and replace IC303 and IC304 NO Check C341 C347 and G2 wire Check around FBT circuits also YES YES YES YES 30 Proper AC voltage are on all cathodes Proper DC voltage are on all cathodes G2 voltage is right ...

Page 31: ...G2 control volume and FBT Check IC302 and related components Check P302 Assy YES YES YES 21 Unsynchronized Image Compare input sync of IC401 Pin52 and 53 with output sync of IC401 49 and 50 NO NO NO Done Check and replace IC401 Check and replace IC401 Check and replace IC401 YES YES YES 31 Are they all right Are H_Out and V_Out of IC401 Pin 20 18 Are H_FLYBACK of IC401 Pin 21 right ...

Page 32: ...et YES Aging monitor and check for focus change NO Refer to 15 Dynamic Focus Failure NO Replace the CRT and verify focus YES Dynamic focus circuit is right 32 Degaussing circuit is right Purity is right 23 Purity Failure Degaussing YES NO Replace CRT and verify purity Done Refer to 6 NO Degaussing NO YES ...

Page 33: ... 33 E XP L ODE D V IE W ...

Page 34: ...BM CA 137 4815TKT017K SHIELD ASSEMBLY TOP L CHASSIS 332 102F SCREW PTP 4 20BP MSWR FZMY 3313T19082C MAIN TOTAL ASSEMBLY T910BM BRAND CA 137 6871TMTA93C PWB PCB ASSEMBLY MAIN T910BM CA 137 Description Part No Ref No 4950TKK292C METAL REAR T910 DI LOCAL 3091TKC112R CABINET ASSEMBLY T910BK BRAND TKC080 DOW TCO 3091TKC112M CABINET ASSEMBLY T910BK BRAND TKC080 DOW TCO 3091TKC112B CABINET ASSEMBLY T910B...

Page 35: ...TR C414 0CE106CF638 10UF SHL SD 16V M FM5 TP 5 C415 0CQ6821N419 6800PF 100V J PE NI TP C417 181 288B MKT 100V 104JTR PHS26104 C418 0CQ1031N419 0 01UF D 100V 5 PE NI TP5 C419 181 476R 2200 D 100V H PP NI TP5 C420 0CQ6831N509 0 068UF D 100V 10 PE TP5 C421 0CQ1021N419 1000P 100V J POLY NI TP C422 0CK2220K515 2200PF D 50V 10 B Y5P TR C423 0CK2220K515 2200PF D 50V 10 B Y5P TR C424 0CE4756F618 4 7UF SMS...

Page 36: ...0DS124409AA 1SS244T 72 ROHM KOREA TAPING DO34 250V 625MA 1A 75N SEC 10UA D313 0DS124409AA 1SS244T 72 ROHM KOREA TAPING DO34 250V 625MA 1A 75N SEC 10UA D314 0DS124409AA 1SS244T 72 ROHM KOREA TAPING DO34 250V 625MA 1A 75N SEC 10UA D315 0DS124409AA 1SS244T 72 ROHM KOREA TAPING DO34 250V 625MA 1A 75N SEC 10UA D316 0DR140059DA 1N4005TB52 TP LITEON DO41 600V 1A 40A SEC 5UA D403 0DS141489AB 1N4148 TP GRA...

Page 37: ...NG 3510MM RADIAL FB507 6210TCE003B BRS3580B BO SUNG 3580MM RADIAL FB701 6210TCE003L BAS3580T BO SUNG 3580MM AXIAL52MM FB702 6210TCE003H BAS3510T BO SUNG 3510MM AXIAL52MM FB901 6210TCE003A BRD3510B BO SUNG 3510MM RADIAL FB904 6210TCE003K BAS3550T BO SUNG 3550MM AXIAL52MM FB905 6210TCE003C BRD3514B BO SUNG 3514MM RADIAL FB906 6210TCE003H BAS3510T BO SUNG 3510MM AXIAL52MM FB907 6210TCE003H BAS3510T B...

Page 38: ... R406 0RD2201Q609 2 20K 1 4W 3 5 TA52 R407 0RD4701Q609 4 70K 1 4W 3 5 TA52 R409 0RD1000Q609 100 1 4W 3 5 TA52 R410 0RD1000Q609 100 1 4W 3 5 TA52 R411 0RD1000Q609 100 1 4W 3 5 TA52 R412 0RD0102Q609 10 1 4W 3 5 TA52 R413 0RD1000Q609 100 1 4W 3 5 TA52 R414 0RD4701Q609 4 70K 1 4W 3 5 TA52 R415 0RD1000Q609 100 1 4W 3 5 TA52 R416 0RN3301F409 3 3K OHM 1 6 W 1 00 TA52 R417 0RN2701F409 2 7K OHM 1 6 W 1 00 ...

Page 39: ...2K665 43OHM 2 W 5 SF R869 0RX0332K665 33 OHM 2 W 5 SF R870 0RX0332K607 33 OHM 2 W 5 TA62 R871 0RX0332K607 33 OHM 2 W 5 TA62 R872 0RD2401Q609 2 40K 1 4W 3 5 TA52 R902 0RD0102Q609 10 1 4W 3 5 TA52 R903 0RD0512Q609 51 1 4W 3 5 TA52 R905 0RX7502K607 75K OHM 2 W 5 00 TA62 R906 0RX7502K607 75K OHM 2 W 5 00 TA62 R907 0RN1800F409 180 OHM 1 6 W 1 00 TA52 R908 0RN0220H609 0 22 1 2W 5 TA52 R909 0RD1002Q609 1...

Page 40: ... BSC25 1485 98KHZ 13MM FUJIAN FURI HITACHI 19 T702 6170TCZ013B EI2218 26UH D FOCUS F700PL T703 6170TCZ008A EE2218 1 3MH FB995C T901 6170TMZ156A EER4045 150UH V 18PIN T910BL SI TC SC NY 98KHZ TH901 6322B00003A J502P62D070Q290 JA HWA 7 OHM 30 20 2 PIN HF VR901 180 035D EVN DJAA03B32 MEC 300B X401 6212AA2004L HC 49U TXC 48MHZ 20 PPM 22PF BULK DIP 40 S AL LOC NO PART NO DESCRIPTION SPECIFICATON S AL L...

Page 41: ...1 45 46 15 Q706 Base 16 Q706 Collector 17 18 n Q705 Drain Q720 Collector 5 Q703 Drain 19 14 FBT FO 4 IC401 18 7 6 7 IC601 1 IC601 2 8 9 IC302 19 20 21 10 WF1 WF2 WF7 WF12 WF13 WF11 WF10 WF6 WF4 WF3 WF8 WF9 WF5 WF18 WF15 WF16 WF19 WF14 41 42 Q719 Drai IC302 5 6 7 IC302 1 ...

Page 42: ...RINTED CIRCUIT BOARD 1 CONTROL BOARD Component Side Side t nen o mp o C D R A O B N I A M 3 D AR O B N AI M 4 de i S r de l o S 5 VIDEO BOARD component side 6 VIDEO BOARD solder side 2 CONTROL BOARD Solder Side ...

Page 43: ...Sep 2005 P NO 38289S0019B Printed in China ...

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