LG LAD-9600 Service Manual page 24

Av multimedia system
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2) NO AUDIO OUTPUT
NO AUDIO OUTPUT
Is 9V applied to audio IC?
(IC505 PIN42, IC506 PIN29)
A/V Switch audio output signal?
(IC505 PINS52/54)
Audio processor audio output signal?
(IC506 PINS21/22/24/25)
Is power supplied to POWER AMP IC?
(IC507 PIN6/20)
Does 5V appear at IC507 PINS4,22?
(TW5209/5210)
Power Amp audio output?
CHECK CONNECTOR (CN501)
YES
YES
YES
YES
YES
YES
YES
NO
Check 9V LDO output (IC520 PIN4 )
NO
NO
NO
Check backup power supply (JT5101)
NO
Check MICOM port (IC501 PINS38,39)
NO
3-9
Check audio output path
Check audio output path
Check audio output path

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