LG HT552TH - Opt.

3-9
4. AUDIO µ-COM CIRCUIT(DVD & AMP)
YES
Does CD/DVD appear
at FLD?
Does AV1, TV Audio, AV1 opt.
and FM 87.5 appear at FLD
OK
Does Loading appear
at FLD?
POWER ON
YES NO
YES
Does no Disc or Time
appear at FLD?
NO YES
NO
NO
NO
NO
NO
NO
Does it appear DVD Error
at FLD?
Refer to SMPS.
Refer to oscillator Circuit.
Check IC101 Reset
Waveform.
Check 3.3V line.
Check Power section
Circuit.
NO
Check power part of Main
B/D.
Check oscillator of X101.
Check if IC101 Pin41
is high.
Check if IC101 Pin15, 16,
47 are high(5V).
Check if IC101 Pin1
is high.
Replace IC101.
NO
NO
Check if DVD an Audio
Micom Insert is OK.
Check Power.
YES
Check DVD Module.
YES
Check SMPS.
YES YES
YES
YES
YES
YES
YES