TROUBLE SHOOTING

1. RF-STEREO MODEL

1) PICTURE OK / NO SOUND

Selected correct system in menu

OK

Check the waveform IF 1 of TU101

OK

Check the waveform at pin 4, 5 of IC501

OK

NO

NO

Check/ Replace TU101 or Input signal

Check the voltage at pin 3, 9, 16, 43, 86, 88, 90 of UOCIII

NO

Check/ Replace IC501

Check the waveform at pin 4, 12 of IC601

OK

Check the waveform at pin 6 of IC601

OK

NO

NO

Check the voltage at pin 57, 58 of

UOCIII

Check/ Replace Q603

Check the waveform at pin 1, 2, 14, 15 of IC601

OK

Check the waveform at pin 3, 13 of IC601

NO

NO

Check/ Replace IC601

Check/ Replace R823, D826

2) No Raster / Sound OK(1/2)

Check the Heater voltage of

CPT(6~6.4 Vrms)

Check HV, Screen voltage of CPT

Check R, G, B out of CPT board

Check the Heater pulse of FBT T402

Check FBT T402

Check 197V line of CPT Board & if no problem check and Replace

Check IC901,

P402A

Check RF901, P402, P402B, FR401

Check FBT T402

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LG Electronics 29FX6ALX-ZG service manual Trouble Shooting, Uociii