LG HT303PD Service Manual page 21

7. AUDIO µ-COM Circuit(DVD & AMP)
Power On.
YES
Does
CD/DVD appear at
FLD?
YES
Does
NO
Loading appear
at FLD?
YES
Does
NO
no Disc or Time
appear at FLD?
YES
Check
if DVD an audio
micom insert is
OK.
YES
NO
Check Power.
YES
Check DVD Module.
YES
Check SMPS.
LGE Internal Use Only
NO
Does
NO
it appear DVD Error
at FLD?
YES
Check
NO
power part of Main
B/D.
YES
NO
Check
oscillator of
X101.
YES
Check
NO
if IC101 Pin5
is high.
YES
Check
NO
if IC101 Pin9,36,59 are
high(5V).
YES
Check
NO
if IC101 Pin49
is high.
YES
Replace IC101.
2-12
Does Aux,
Scart, opt and FM 87.5
appear at FLD.
NO
Refer to SMPS.
Refer to oscillator circuit.
Check IC101 reset
waveform.
Check 3.3V line.
Check power section
circuit.
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Only for training and service purposes
YES
OK