Trouble Shooting - LG 29FB5RL Service Manual

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
Check the waveform at pin 4, 12 of
IC601
OK
Check the waveform at pin 6 of IC601
OK
Check the waveform at pin 1, 2, 14, 15
of IC601
OK
Check the waveform at pin 3, 13 of
IC601
2) No Raster / Sound OK(1/2)
Check HV, Screen voltage of CPT
Check FBT T402
Check 197V line of CPT Board &
if no problem check and Replace
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T R O U B L E S H O OTING
NO
Check/ Replace TU101 or Input signal
NO
Check the voltage at pin 3, 9, 16, 43,
86, 88, 90 of UOCIII
NO
Check the voltage at pin 57, 58 of
UOCIII
NO
Check/ Replace Q603
NO
Check/ Replace IC601
NO
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
- 14 -
NO
Check/ Replace IC501
Check the Heater pulse of FBT T402
Check FBT T402
Check RF901, P402,
P402B, FR401