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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