Text preview for : MC022Ats.pdf part of LG RT29FA33R Circuits and service info for RT29FA33R TV



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TROUBLE SHOOTING
RF- STEREO

Selected correct system In menu
OK

Check the waveform At pin 17 of TU101
OK

NO

Check / Replace TU 101
NO

Check the waveform At pin 24,25 of IC661
OK

NO

Check The Voltage At pin 16,33,46, of IC661 Check / Replace Q671, 672 Check / Replace Q621, IC603

Check The voltage At pin of IC610, IC853
NO

Check the waveform At pin 4,12 of IC602
OK

NO

Check / Replace IC610, IC853

Check the Voltage At pin 6, 7 of IC602
OK

NO

Check the waveform At pin 1, 2, 14, 15 of IC602
OK

Check the Voltage At pin 3,13 of IC602

NO

Check / Replace F851, D862

No Raster / Sound OK

Check the Heater voltage of CPT (6 ~ 6.5Vrms) OK NO

Check HV, Screen Voltage of CPT NO OK

Check IK Current of IC01, pin37,39,40 NO OK

Check the Heater pulse of FBT T402 NO

Check / Replace CPT Board Components

Check FR901, P402A P402B, P302

Check FBT T402

Check FBT T402

Check IC01, Q901, IC901 P03A, P03B, P541

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NO RASTER CHECK B+ At D807 cathode Normal Is the voltage at Pin 25, 54 of IC01 3.3V? Yes Check pin 24 Of IC01(H - Out) Yes Check Q402 Collector waveform No Check & Replace Q402 Yes Check / Replace IC801, IC803, IC802 Check T401 & each pin voltage No Check & Replace T401 Yes No Check IC01 Pin1 high? No Check the In/out of IC06, IC07 Ok Check the Voltage Of C804 254~380 V Check the Voltage Pin 3 of IC801 Check / Replace Fuse , DB801 Abnormal Open

Check Fuse of AC line

No Check & Replace IC01

0V Check / Replace Fuse DB801

Check & Replace T402 Yes Check / Replace IC01

No Yes Is the voltage at pin3,15,45 IC02 5V? No Check & Replace IC01, IC03 Check the In/out of IC855,IC851 No Check the Voltage at D860 or D858 cathode No Check & Replace F853 ,F855

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No Picture / No Sound

Is any OSD displayed? No OK Check IC01 pin37,42,43,44 (IK, R,G,B) OK Check receiving system in MENU & execute Auto - Program. OK

No Check / Replace IC01

Does the auto - Program Operate properly. OK Store on manual - program MENU

Check 5V, 33V & IIC Bus Line

No

Check 5V, 33V & IIC Bus Line Of Tuner. OK No

Go to No Sound / Picture OK

Check / Replace IC01, Tuner OK Check CVBS signal Line & IC01

Is the CVBS signal OK. (IC01 pin10 or 22) OK

Check IK Signal at IC01 pin37 (similar to CBVS)

No

Check R,G,B signal At IC01, pin42,43,44 OK Check / Replace CPT Board component

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AV Stereo

Select correct system In menu
OK OK

Check the connection Of AV equipment AV Check the the waveform At pin47 of IC661
OK NO NO

Check TU101 Tuner

OK

Check the waveform At pin 24, 25, of IC661
OK

Check the voltage Of pin16,20

Check waveform At pin 4, 12 of IC602
OK

NO

Check / Replace IC602

Check the voltage At pin6,7 of IC602
OK

NO

Check / Replace Q621, IC603

Check the waveform At pin 1,2,14,15 of IC602

NO

Check the vpltage At pin3, 13 of IC602
OK

NO

Check /Replace F851, D862

Replace IC 602

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