Troubleshooting; The Power Cannot Be Turned On; The Fuse Blows Out; When The Output Voltage Fluctuates - Philips 55PFL4909 Service Manual

Note: This Troubleshooting section covers the entire PL14.26 chassis models. Thus some Reference number of
parts shown below may not be used depending on the model. Please refer to the parts list for each model.
[Power Supply Section]
FLOW CHART NO.1

The power cannot be turned on.

Is the fuse (F602) normal?
Is the P-ON+21V line voltage normal?
FLOW CHART NO.2

The fuse blows out.

FLOW CHART NO.3

When the output voltage fluctuates.

FLOW CHART NO.4
When buzz sound can be heard in the periphery of power circuit.

TROUBLESHOOTING

Yes
Yes
Yes
Yes
No
See FLOW CHART No.2 <The fuse blows out.>
No
Check if there is any leak or short-circuit on the
primary circuit component and repair it if defective.
(C625, C665, D601, D602, D603, D604, D605, D606,
D607, D613, D617, D618, D621A, D623, D664, IC601,
No
IC602, Q601, Q602, Q603, T601, R630, R631)
No
Check IC602, D654, D660, D661, Q653 and their
periphery circuit. Repair it if defective.
8-1 PL14.26ATR