(No.YA711<Rev.002>)1-21
See FLOW CHART No.8
TUNER+5V is not output. (PANEL+13V is outputted normally.)
FLOW CHART NO.10
Is approximately +6.7V voltage supplied to the
collector of Q637?
Is approximately +6V voltage supplied to the
base of Q637?
No
Ye s
Ye s
Check D659 and their periphery circuit, and service
it if defective.
No
Replace Q637.
P-ON+3.3V(PANEL+3.3V) is not output.
FLOW CHART NO.12
Is appro
ximately +5V voltage supplied to the
cathode of D639?
Is the "H" signal (approximately +3.5V) inputted to the
base of Q640?
No
Ye s
Ye s
Check C639, D639 and their periphery circuit, and
service it if def
ective.
Check Q638, Q639, P-ON-H2 line and their periphery
circuit, and service it if defective.
No
No
EV+3.3V is not output.
FLOW CHART NO.13
Is approximately +4.6V voltage supplied to the
collector of Q903?
Ye s
Replace Q640.
Check Q903, D905 and their periphery
circuit, and service it if defective.
P-ON+3V is not output.
FLOW CHART NO.11
Is approximately +3V voltage supplied to the
cathode of D638?
Ye s
No
Check if there is any leak or short-circuit on
the loaded circuit, and service it if defective.
Check C638, D638 and their periphery circuit, and
service it if defective.
Check C638, D638 and their periphery circuit, and
service it if def
ective.
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