LG Lafinion 82W - Troubleshooting: Sound and Picture Quality; No Sound with Picture OK; Video Modulator (VM) Malfunctions; Pin Cushion Distortion Correction

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PIN CUSHION
47
IC501S.
IC501S. IC401
IC401
R424.
Q404, Q405.
L402,403,C423.
Check the waveform
at pin 11 of P901B.
Checkthe waveform at
pin10 of HIC951.
Check the Vcc at pin11(135V).
Check the Vcc at pin4(12V).
NORMAL
Q501,IC501S.
18V
D850,F851.
Check the voltage at pin1,15
of IC650(SOUND AMP).
CHECK/REPLACE
IC650.
2.5V
0V
CHECK/REPLACE
Q601,Q602,L601.
CHECK/REPLACE
TU101.
Check the waveform
at PIN 8,13 of IC 650.