Philips 32MF338B/27, Руководство по обслуживанию

Страница: 26 / 93

26 FUZ2.0U LA
P-ON+3.3V (LCD+3.3V) is not output.
FLOW CHART NO.12
Is approximately 5V voltage supplied to the
cathode of D632?
Is approximately 4V voltage supplied to the
base of Q638?
LCD+13V is not output.
FLOW CHART NO.10
Is approximately 15V voltage supplied to the
cathode of D633?
Is approximately 14V voltage supplied to the
base of Q645?
No
No
Yes
Yes
Check C633, D633 and their periphery circuit, and
service it if defective.
Check C663, D637 and their periphery circuit, and
service it if defective.
Yes
No
See FLOW CHART No.9
Yes
Replace Q646.
Yes
Replace Q638.
Replace Q645.
See FLOW CHART No.9
No
Check C634, D632 and their periphery circuit, and
service it if defective.
No
Check Q639, Q671 and their periphery circuit, and
service it if defective.
No
LCD-6.8V is not output.
FLOW CHART NO.11
Is approximately -9V voltage supplied to the
anode of D637?
Is approximately -9V voltage supplied to the
base of Q646?
Yes
+3.0V is not output.
FLOW CHART NO.13
Is approximately 3V voltage supplied to the
cathode of D647?
Check if there is any leak or short-circuit on
the loaded circuit, and service it if defective.
Yes
Check C664, D647 and their periphery circuit, and
service it if defective. No