1-18 (No.YA683<Rev.001>)
LCD+3.3V is not output.
FLOW CHART NO.12
Is approximately 8V voltage supplied to the cathode of
D924?
Is approximately 4V voltage supplied to the base of Q902?
LCD+13V is not output.
FLOW CHART NO.10
Is approximately 23V voltage supplied to the cathode
of D990?
Is approximately 13V voltage supplied to the base of Q922?
No
No
Yes
Yes
Check D990, C902 and their periphery circuit, and
service it if defective.
Check D905, C905 and their periphery circuit, and
service it if defective.
Check R945 and their periphery circuit, and service it
if defective.
Yes
No
Yes
Replace Q908.
Yes
Replace Q902.
Replace Q922.
See FLOW CHART No.9
No
Check D924, C917 and their periphery circuit, and
service it if defective.
No
Check D920, R930 and their periphery circuit, and
service it if defective.
No
LCD-6.8V is not output.
FLOW CHART NO.11
Is approximately -12V voltage supplied to the anode of
D905?
Is approximately -11V voltage supplied to the base of
Q908?
Yes
Is approximately 18V voltage supplied to the collector
of Q922?
No
Check R953, R954, R955 and their periphery circuit,
and service it if defective.
Yes
Is approximately 7V voltage supplied to the collector
of Q902?
Yes
Check D974, D975 and their periphery circuit, and
service it if defective.
No
