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1. RF-STEREO MODEL
1) PICTURE OK / NO SOUND
Selected correct system in menu
Check the waveform IF 1 of TU101
Check the waveform at pin 4, 5 of IC501
Check the waveform at pin 4, 2 of IC601
Check the waveform at pin 6 of IC601
Check the waveform at pin 8, 9, 11, 12
of IC601
Check the waveform at pin 5, 7 of IC601
2) No Raster / Sound OK(1/2)
Check HV, Screen voltage of CPT
Check FBT T402
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Only for training and service purposes.
TROUBLE SHOOTING
OK
NO
OK
NO
OK
NO
OK
NO
OK
NO
OK
NO
Check R, G, B out of CPT board
Check 197V line of CPT Board &
if no problem check and Replace
Check/ Replace TU101 or Input signal
Check the voltage at pin 3, 9, 16, 43,
86, 88, 90 of UOCIII
Check the voltage at pin 57, 58 of
UOCIII
Check/ Replace Q601
Check/ Replace IC601
Check/ Replace R823, D826
Check the Heater voltage of
CPT(6~6.4 Vrms)
Check IC901,
P403A
- 16 -
NO
Check/ Replace IC501
Check the Heater pulse of FBT T402
Check FR901, P403A,
P902B, FR401
Check FBT T402
LGE Internal Use Only
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