FUNAI LT850-M26 - SERVICE, Руководство по обслуживанию

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8-2 A0CA0TR
P-ON+5V is not output.
FLOW CHART NO.6
Yes
Yes
No
Is approximately 5V voltage supplied to the base of
Q518?
AL+3.3V is not output.
FLOW CHART NO.5
Yes
No
Is approximately 7V voltage supplied to the collector
of Q521?
Check D525, 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 7V voltage supplied to the collector
of Q518?
Replace Q518.
No
LCD+12.5V is not output.
FLOW CHART NO.8
Is approximately 18V voltage supplied to the cathode
of D504?
No
Yes
Yes
Check D504, D505, C503 and their periphery circuit,
and service it if defective.
Replace Q503.
Is approximately 14V voltage supplied to the base
of Q503?
No
Check Q504, Q505, D506, D507, P-ON-H1 line and
their periphery circuit, and service it if defective.
LCD+24V is not output.
FLOW CHART NO.7
Yes
No
Is approximately 31V voltage supplied to the cathode
of D514?
Is approximately 31V voltage outputted to the collector
of Q504?
Is approximately 24V voltage supplied to the emitter
of Q405?
Yes
Check Q404, Q405 and their periphery circuit, and
service it if defective.
Check D514, D516, C511 and their periphery circuit,
and service it if defective.
No
Check Q504, Q505, P-ON-H1 line and their periphery
circuit, and service it if defective.
No
Check D512 and their periphery circuit, and service it
if defective.
Yes