Daewoo SD-8100, Service Manual

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12
TROUBLESHOOTING
3. VIDEO circuit
EE screen doesn’t appear.
Is Video signal input at IC301
pin#48,50,52,54?
Is 5V obtained at IC301 pin#24,
42, 55, 72, 91?
Is signal input at IC302
pin#1,5,12,13,14,15?
Check LINE JACK and IF circuit.
Check DVD circuit.
Check POWER 5V.
Check LINE JACK and IF circuit.
Check DVD circuit.
NO
A. EE screen doesn’t appear
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
Is signal input at IC601 pin#50?
Check PCB Pattern.
Is signal output at IC302 pin#3?
Check IC302 pin#16VCC. Check
IC302 pin#9,10,11(control DC)
Is signal output at IC601 pin# 52?
Check IC604 pin#3(C sync).
Is signal output at IC301
pin# 62, 63?
Check VCC of IC301 and
pin #68,69.
Check RF Output.
Check LINE.
Is signal input at IC301 pin# 56?
YES
Check PCB Pattern.
NO