Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

[sfernandes]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

Anyone know what I could check next?

[Dannyx]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

Does the relay indeed close when you apply 5v to P-on ? I assume it does

[sfernandes]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

Does the relay indeed close when you apply 5v to P-on ? I assume it does

Yes I hear the relay make one click when power is applied.

[Dannyx]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

Is it possible to put together a list of the components you've already replaced, including capacitors ? I'm mostly interested in the small caps on the primary.

[sfernandes]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

Is it possible to put together a list of the components you've already replaced, including capacitors ? I'm mostly interested in the small caps on the primary.

Here is the list so far I have replaced...

C1725, C1727, C1728 and C1402

IC1201, IC1401 and IC1702

[Dannyx]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

The rule of thumb when you're at wits' end and can't seem to get a power supply to turn on for the life of you is to replace every small cap on the primary...this is getting silly already Once you've got one going, the next time you get a similar supply with the same fault you'll know exactly where to look.

[sfernandes]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

The rule of thumb when you're at wits' end and can't seem to get a power supply to turn on for the life of you is to replace every small cap on the primary...this is getting silly already Once you've got one going, the next time you get a similar supply with the same fault you'll know exactly where to look.

The primary side of the power supply is the HOT side correct?

[Dannyx]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

The primary side of the power supply is the HOT side correct?

Yes, where that main cap is located. The secondary is uninteresting at this point, since it appears to function normally, though I could be wrong....

[budm]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

What DCV do you have on the PFC IC controller IC1401 (HPA00651DR/UCC28060) pin 2, 7, and 8 with ref. to primary circuit GND (negative leg of the main cap).
I suspect bad resistor networks R1425~1428_R1429, R1430~1433_R1407_1408, R1401~1404_R1405.

[sfernandes]

Re: Philips 55PFL3907/F7 Dead, No Standby LED, Nothing, Please Help

Thanks for everyones help on this, but I have finally threw in the towel on this one and sourced a power supply and installed it and the set is working fine now. I did learn a lot though that will help me with other repairs and I thank you all for that. Cheers.