Sharp LC-20AV7U Service Manual - Page 20

A7144_45TS

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FLOW CHART NO.6 VT+33V is not output. Is approximately 35V voltage supplied to the cathode of D909? Yes No See FLOW CHART No.5 Check D928, R952 and their periphery circuit, and service it if defective. FLOW CHART NO.7 INV+22V is not output. Is approximately 22V voltage supplied to the cathode of D901? Yes Check if there is any leak or short-circuit on the loaded circuit, and service it if defective. FLOW CHART NO.8 DTV-ON+3.3V is not output. No Check D901, C901 and their periphery circuit, and service it defective. Is approximately 5V voltage supplied to the cathode of D906? Yes No Check D906, C905 and their periphery circuit, and service it if defective. Check Q908, D923 and their periphery circuit, and service it if defective. FLOW CHART NO.9 DTV-ON+2.5V is not output. Is approximately 5V voltage supplied to the cathode of D906? Yes No See FLOW CHART No.8 Check Q909, D924 and their periphery circuit, and service it if defective. 7-3 A7144_45TS

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7-3
A7144_45TS
VT+33V is not output.
FLOW CHART NO.6
Yes
No
Is approximately 35V voltage supplied to the
cathode of D909?
See FLOW CHART No.5
Check D928, R952 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.
INV+22V is not output.
FLOW CHART NO.7
Is approximately 22V voltage supplied to the
cathode of D901?
No
Yes
Check D901, C901 and their periphery circuit, and
service it defective.
DTV-ON+2.5V is not output.
FLOW CHART NO.9
Yes
No
Check Q909, D924 and their periphery circuit,
and service it if defective.
See FLOW CHART No.8
DTV-ON+3.3V is not output.
FLOW CHART NO.8
Yes
No
Is approximately 5V voltage supplied to the
cathode of D906?
Check D906, C905 and their periphery circuit, and
service it if defective.
Check Q908, D923 and their periphery circuit,
and service it if defective.
Is approximately 5V voltage supplied to the
cathode of D906?