Philips 23PFL5522D/12 PSU problems

[sparkydz]

Re: Philips 23PFL5522D/12 PSU problems

Well I've replaced all the caps (Panasonic FM or FR), but PSU still buzzing and cycling. I guess I'll try looking for a problem further upstream. Not easy without a service manual or even a circuit diagram, but I'll have a go and post the results.

-- Mike

[sparkydz]

Re: Philips 23PFL5522D/12 PSU problems

Finally got the set working again, after it sitting in a corner gathering dust. A schottky diode had blown, maybe at the same time as the zener. It was an SB360 and luckily I found a similar one in an old PSU - SB340. I think the 40V should be OK here, but I'll order a couple of SB360 next time I've got a bigger order to do.

Now to see if I can fix the remote control, although I think the spilt orange juice was probably terminal.

Thanks for a great site,
Mike

[sparkydz]

Re: Philips 23PFL5522D/12 PSU problems

Update on the remote:
Seems the orange juice must have eaten away a track _under_ the SMD controller chip, so one row of the keyboard matrix was out - soldered in a bit of very fine transformer wire to replace the track and bingo! Nice to have things working again...

Mike

[Ltank]

Re: Philips 23PFL5522D/12 PSU problems

Transformer buzzing can be caused by loose laminations in the transformer or the switching circuit is oscillating at the wrong frequency

[hermanus]

Re: Philips 23PFL5522D/12 PSU problems

Hi There
I have the same PSU board,
Somebody changed the Caps But i think they have thewrong values
can sombody tell me the listing of the caps because I have the drawing but without the values