8-7 A91F3TR
P-ON+3V is not output.
FLOW CHART NO.11
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.
P-ON+3.3V is not output.
FLOW CHART NO.12
Is approximately +5V voltage supplied to the
cathode of D633?
Is the "H" signal (approximately +3.5V) inputted to the
base of Q637?
No
Ye s
Ye s
Check C633, D633 and their periphery circuit, and
service it if defective.
Check Q638, Q639, P-ON-H2 line and their periphery
circuit, and service it if defective.
No
Replace Q637.
P-ON+9V is not output. (LCD+12V is outputted normally.)
FLOW CHART NO.13
Is approximately +13V voltage supplied to the
collector of Q642?
Is approximately +10V voltage supplied to the
base of Q642?
Is approximately +5V voltage supplied to Pin(3) of
IC631?
No
Ye s
Ye s
Ye s
Check D670 and their periphery circuit, and service
it if defective.
No
Check Q635, D659 and their periphery circuit, and
service it if defective.
See FLOW CHART No.5
See FLOW CHART No.10
No
No
AL+3.3V is not output.
FLOW CHART NO.14
Is approximately +34V voltage supplied to the
collector of Q635?
Ye s
Replace IC631.
Replace Q642.
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