LG 1FS2CLX-ZV, Service Manual, Page: 14 / 29

TROUBLE SHOOTING
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1. RF-STEREO MODEL
1) PICTURE OK / NO SOUND
Check/ Replace TU101 or Input signal
NO
OK
Selected correct system in menu
Check the waveform IF 1 of TU101
Check the voltage at pin 3, 9, 16, 43,
86, 88, 90 of UOCIII
NO
Check/ Replace IC11
NO
Check the voltage at pin 57, 58 of
UOCIII
NO
OK
Check the waveform at pin 4, 5 of IC11
OK
Check the waveform at pin 4, 12 of
IC601
Check/ Replace Q603
NO
OK
Check the waveform at pin 6 of IC601
Check/ Replace IC601
NO
OK
Check the waveform at pin 1, 2, 14, 15
of IC601
Check/ Replace R823, D826
Check the Heater voltage of
CPT(6~6.4 Vrms)
Check R, G, B out of CPT board
Check IC901,
P402A
Check 190V line of CPT Board &
if no problem check and Replace
Check the Heater pulse of FBT T402
Check RF901, P903C,
P903B, FR401
Check FBT T402
Check HV, Screen voltage of CPT
Check FBT T402
NO
OK
Check the waveform at pin 3, 13 of
IC601
2) No Raster / Sound OK(1/2)