Amp / Pwm - LG LAS855M Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. AMP / PWM

Set turns on
but there is no sound.
YES
Check the connection
of CN803 & CN804.
YES
PVDD should be
25 VA (C7038).
YES
GVDD should be
12 V (R7014).
NO
PWM data
should be shown.
(R612, R613)
YES
L601 should be 3.3 V.
YES
Check Oscillation
24.576 MHz (R601).
YES
PWM_RST should
be high (R604).
YES
Replace IC600.
NO
Connect CN803 & CN804.
NO
Check adaptor.
Pin2 of IC601
YES
should be high
(R614).
NO
Replace IC600.
NO
Pin1 of IC307
should be 3.4 VA.
Pin3 of IC307
should be high (R338).
Replace IC307.
NO
Replace X600.
NO
Check micom (IC100).
2-24
NO
YES
NO
YES
NO
YES
Replace IC601.
Check power.
Check micom (IC100).