Dtv-On+5V Is Not Output; Al+3.3V(D) Is Not Output; Panel+3.3V Is Not Output; Al+1.2V(D) Is Not Output - Sharp LC-20AV7U Service Manual

FLOW CHART NO.10

DTV-ON+5V is not output.

Is approximately 6.8V voltage supplied to the
cathode of D903?
Is approximately 6.6V voltage supplied to the
collector of Q905?
Is the voltage of base on Q905 lower than the
voltage of emitter on Q905 when turning the
power on?
Replace Q905.
FLOW CHART NO.11

AL+3.3V(D) is not output.

Check Q902, D920 and their periphery circuit,
and service it if defective.
FLOW CHART NO.12

PANEL+3.3V is not output.

Is the voltage of base on Q910 lower than the
voltage of emitter on Q910 when turning the
power on?
Replace Q910.
FLOW CHART NO.13

AL+1.2V(D) is not output.

Check IC901 and the periphery circuit,
and service it if defective.
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
See FLOW CHART No.11
No
No
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