6-3
L0370TS
AL+3.3V is not outputted.
FLOW CHART NO.6
Yes
No
Is 3.3V
voltage supplied to the cathode of
D514?
Check D635,C637 and their periphery circuit, and
service it if defective.
Yes
Replace Q516.
Check if there is any leak or short-circuit on
the loaded circuit and service it if defective.
No
Check Q517 and P-ON-H line, and service it if
defective.
Is the voltage of base on Q516 lower than the
voltage of emitter on Q516 when turning
the power on?
AL+40V is not outputted.
FLOW CHART NO.7
Is approximately 40V voltage supplied to the
emitter of Q516?
No
Yes
Check D645,D646,C644 and their periphery circuit,
and service it if defective.
AL+33V is not outputted.
FLOW CHART NO.9
Yes
No
Check D641,C648,C649,R658 and their
periphery circuit, and service it if defective.
See FLOW CHART No.7
AL+5V is not outputted.
FLOW CHART NO.8
Yes
No
Is 5V
voltage supplied to the cathode of D633?
Check D633,C635 and their periphery circuit, and
service it if defective.
Check if there is any leak or short-circuit on
the loaded circuit and service it if defective.
Is approximately 40V voltage supplied to the
emitter of Q516?
Is the voltage of base on Q427 lower than the
voltage of emitter on Q427 when turning
the power on?
Yes
No
Is 12V voltage supplied to the emitter of Q427?
Check C634,C636,L630 and their periphery circuit,
and service it if defective.
No
Check Q401 and BACKLIGHT-SW line, and
service it if defective.
Yes
Replace Q427.
Check D630,D632 and their periphery circuit, and
service it if defective.
No
AL+12V is not outputted.
FLOW CHART NO.10
Is approximately 12V voltage supplied to the
cathode of D630?
Yes
