Philips 22PFL4507/F7 - Page 28

8-2 PL12.0ATR
No
AMP+13V is not output.
FLOW CHART NO.6
Is approximately
+13V voltage supp
lied to the cathode
of D653?
Ye s
Check D653, D654, C654, C655 and their periphery
circuit. Repair it if defective.
Check if there is any leak or s
hort-circuit on the load
circuit. Repair it if defective.
Check if there is any leak or short-circuit on the load
circuit. Repair it i
f defective.
P-ON+21V is not output.
FLOW CHART NO.5
Is approximately +21V voltage supplied to the cathode
of D650?
No
Ye s
Check D650, C651, C652 and their periphery circuit.
Repair it if defective.
AL+3.3V is not output.
FLOW CHART NO.7
Is approximately +21V voltage supplied to the
collector of Q656?
Is approximately +4V voltage supplied to the base of
Q656?
No
Ye s
Ye s
Check D650, C651, C652 and their periphery circuit.
Repair it if defective.
Check D662 and their periphery circuit. Repair it if
defective.
No
Replace Q656.