8-3 A91F3TR
See FLOW CHART No.9
See FLOW CHART No.9
AL+13V(M+13V) is not output.
FLOW CHART NO.12
Ye s
No
Is approximately +13V voltage supplied to the
cathode of D641 and D642?
Check C639, D642 and their per
iphery circuit, and
service it if defective.
Check if there is any leak or short-circuit on
the loaded circuit, and service it if defective.
P-ON+5V is not output. (LCD+16V is outputted normally.)
FLOW CHART NO.10
Is approximately +6.8V voltage supplied to the
collector of Q643?
Is approximately +6V voltage supplied to the
base of Q641 and the base of Q643?
No
Ye s
Ye s
Check D645 and their periphery circuit, and service
it if defective.
No
Replace Q641 and Q643.
P-ON+5V(TUNER+5V) is not output. (LCD+16V is outputted normally.)
FLOW CHART NO.11
Is approximately +6.7V voltage supplied to the
collector of Q640?
Is approximately +6V voltage supplied to the
base of Q641 and the base of Q643(Q640)?
No
Ye s
Ye s
Check D645 and their periphery circuit, and service
it if defective.
No
Replace Q641 and Q643(Q640).
P-ON+3V is not output.
FLOW CHART NO.13
Is approximately +3V voltage supplied to the
cathode of D647?
Ye s
No
Check if there is any leak or short-circuit on
the loaded circuit, and service it if defective.
Check C645, D647 and their periphery circuit, and
service it if defective.
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