LG HT356SD Service Manual page 21

7. AUDIO μ-COM Circuit(DVD & AMP)
Power On.
YES
Does
CD/DVD appear at
FLD?
YES
Does
NO
Reading appear
at FLD?
YES
Does
NO
no Disc or Time
appear at
FLD?
YES
Check
if DVD and AUDIO
CD insert is
OK.
NO
Check Power.
YES
Check DVD Module.
Check SMPS.
NO
Does
NO
it appear DVD Error
at FLD?
YES
Check
NO
power part of Main
B/D.
YES
Check
NO
oscillator of
X101.
YES
Check
NO
if IC101 Pin5
is high.
YES
Check
NO
if IC101 Pin9,36,59 are
high(3.3V).
YES
Check
NO
if IC101 Pin49
is high.
YES
Replace IC101.
2-12
Does Aux,
YES
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.
OK