FUNAI LH8-M40BB - Power Supply Voltage Troubleshooting

8-2 A03P0TR
Replace Q501.
LCD+12V is not output.
FLOW CHART NO.5
Is approximately 1
5V voltage supp
lied to the co
llector
of Q501?
No
Yes
Yes
Check D504, D505, C503 and their periphery circuit,
and service it defective.
Is approximately 1
3V voltage supp
lied to the base
of Q501?
No
Check Q504, Q505, D501, P-ON-H1 line and their
periphery circuit, and service it defective.
P-ON+5V is not output.
FLOW CHART NO.7
Yes
Yes
No
Is approximately 5V voltage supplied to the base of
Q518?
AL+3.3V is not output.
FLOW CHART NO.6
Yes
No
Is approximately 6V voltage supplied to the collector
of Q521?
Check D525, D527, D528, C516 and their periphery
circuit, and service it if defective.
Check D525, C516 and their periphery circuit, and
service it if defective.
Check Q508, Q520, D543, P-ON-H2 line and their
periphery circuit, and service it if defective.
Yes
No
Is approximately 4V voltage supplied to the base
of Q521?
Check D552 and their periphery circuit, and
service it if defective.
Replace Q521.
Is approximately 6
V voltage supp
lied to the collector
of Q518?
Replace Q518.
No
LCD+24V is not output.
FLOW CHART NO.8
Check IC1801, IC1831, IC183
2, Q1801, Q
1802,
T1831 and
their per
iphery cir
cuit, and ser
vice it if
defectiv
e.