LG LH-W750TA Service Manual page 31

3. AUDIO µ-COM Circuit(DVD & AMP)
POWER ON
Does CD/DVD appear
at FLD?
YES
Does Loading appear
at FLD?
YES
Does no Disc or Time
appear at FLD?
YES YES
Check if DVD an Audio
Micom Insert is OK.
YES
Check Power.
YES
Check DVD Module.
Check SMPS.
NO
NO
Does it appear DVD Error
at FLD?
YES
NO
Check power part of Main
B/D.
YES
Check oscillator of X101.
YES
NO
Check if IC101 Pin80
is high.
YES
Check if IC101 Pin32, 51,
80 are high(5V).
YES
Check if IC101 Pin96
is high.
YES
Replace IC101.
Does AV1, TV Audio, AV1 opt.
and FM 87.5 appear at FLD
NO
NO
NO
Refer to SMPS.
NO
Refer to oscillator Circuit.
NO
Check IC101 Reset
Waveform.
NO
Check 3.3V line.
NO
Check Power section
Circuit.
3-8
YES
OK