FUNAI LC195SLX - Flow Chart no

8-3 A91N3TR
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 approximately +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 defective.
Check Q638, Q639, P-ON-H2 line and their periphery
circuit, and service it if defective.
No
FLOW CHART NO.13
Replace Q640.
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.
P-ON+9V is not output. (PANEL+13V is outputted normally.)
Is approximately +13V voltage supplied to the
collector o
f Q641?
Is approximately +10V voltage supplied to the
base of Q641?
No
Ye s
Ye s
Check D666 and their periphery circuit, and service
it if defective.
Check C643, D643 and their per
iphery circuit,
and service it if defective.
No
Replace Q641.