Sharp LC-20AV7U Service Manual - Page 22

Flow Chart No.16, Flow Chart No.17, Flow Chart No.15, Flow Chart No.14

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FLOW CHART NO.14 AL+3.3V(A) is not output. No Is approximately 6.8V voltage supplied to the cathode of D903? Yes Check Q901, D916 and their periphery circuit, and service it if defective. FLOW CHART NO.15 P-ON+5V(1) is not output. No Is approximately 6.8V voltage supplied to the cathode of D903? Yes Check Q903, D921 and their periphery circuit, and service it if defective. FLOW CHART NO.16 +12V is not output. Is approximately 12V voltage supplied to the No cathode of D902? Yes Check if there is any leak or short-circuit on the loaded circuit and service it if defective. FLOW CHART NO.17 P-ON+9V is not output. Is approximately 12V voltage supplied to the No cathode of D902? Yes Is approximately 11.8V voltage supplied to the Yes collector of Q923? No Is the voltage of base on Q923 lower than the No voltage of emitter on Q923 when turning the power on? Yes Replace Q923. See FLOW CHART No.10 See FLOW CHART No.10 Check D902, C902 and their periphery circuit, and service it if defective. See FLOW CHART No.16 Check Q918, D940 and their periphery circuit, and service it if defective. Check Q916 and P-ON-H line, and service it if defective. 7-5 A7144_45TS

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7-5
A7144_45TS
Yes
No
Yes
No
+12V is not output.
FLOW CHART NO.16
Is approximately 12V voltage supplied to the
cathode of D902?
Check if there is any leak or short-circuit on
the loaded circuit and service it if defective.
Check D902, C902 and their periphery circuit, and
service it if defective.
Check Q918, D940 and their periphery circuit, and
service it if defective.
Check Q916 and P-ON-H line, and
service it if defective.
P-ON+9V is not output.
FLOW CHART NO.17
Yes
No
Is approximately 12V voltage supplied to the
cathode of D902?
Is approximately 11.8V voltage supplied to the
collector of Q923?
No
Is the voltage of base on Q923 lower than the
voltage of emitter on Q923 when turning the
power on?
See FLOW CHART No.16
Yes
Replace Q923.
No
P-ON+5V(1) is not output.
FLOW CHART NO.15
Is approximately 6.8V voltage supplied to the
cathode of D903?
Check Q903, D921 and their periphery circuit,
and service it if defective.
Yes
See FLOW CHART No.10
No
AL+3.3V(A) is not output.
FLOW CHART NO.14
Is approximately 6.8V voltage supplied to the
cathode of D903?
Check Q901, D916 and their periphery circuit,
and service it if defective.
Yes
See FLOW CHART No.10