Philips 42PFL5522D/05 Not Powering

[liamoc74]

Hey.. first post but hopefully lots more!!

I have a philips TV i got in..

Initially it was blowing the internal fuse so I took the board out and on the back was what looked like little burn marks on some of the traces, i cleaned them with isoprop and then put it back together.

Now its not blowing the fuse but still not powering..

Done a bit of research on here and decided to check the bridge rectifier..

First I took readings with it in the board..

1-2=532
1-3=517
1-4=0

2-1=517
2-3=1313
2-4=517

3-1=531
3-2=1354
3-4=528

4-1=0

Then removed it and took readings again..

1-2=504
1-3=489
1-4=1142

2-1=1
2-3=1
2-4=489

3-1=1
3-2=1
3-4=498

4-1=1
4-2=1
4-3=1

Then I tested 1-4 on the board itself with the BR removed..

1-4=0

Where too next or any idea of what the prob is..

Thanks in advance,
Liam

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

Looks like you have a short on the output side (DC+/DC-) you should check the other MOSFETs/diodes on the power supply heatsinks for shorts. You only need to check across Drain and Source for a short on a FET.

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Will do..
What should they be reading.?

The one on the same heatsink is reading 003
One on the heatsink bottom left of that heatsink is reading 1

Going to have to get longer probes to read the others..

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

They should all read open circuit - probably a single "1" on your meter. A result near to zero is suspicious - remove the device to confirm.

BTW, you should not use BS1363 ("Bussman") fuse for power supply. It is designed to protect cabling and plug not power supply. You should consider using a light bulb tester. It will save you from blowing more fuses.
https://www.badcaps.net/forum/showthread.php?t=32748

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Ok cool, saw that lastnight, must get one built!!

Think i was testing it the wrong way with the last readings..

Three Pins on MOSFET are from Left -- G.D.S

With that..

One on same heatsink is reading 000 when testing S with positive and D with neg..

Other MOSFET on Heatsink bottom left is reading 425

Will i go ahead with removal of one reading 0.?

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Okay with the MOSFET out its reading 0 between drain and supply..

This part is faulty i take it.?

What would cause it to fail.?

Will replacing it get me back up running.?

With the Bridge Rectifier i removed - is that part ok with it reading 0 from 1-4, can i put it back in.?

Sorry for all the questions, i appreciate the help!!

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

You will need to replace the FET and the IC responsible for driving the FET... You can usually find this IC by tracing back the gate pin on the FET.

You have to replace the IC because the IC can be invisibly damaged by the FET failing. If it is bad it can kill a new FET and cause other damage.

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Okay sound, found the fet on ebay for a couple of quid..

With the IC, is it the one ive noted in the pic..?

How can i test with multimeter, try'd continuity but no joy..

Pic attached..

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

That's the one.

BTW: It's source, not supply. The source is the most negative end of the transistor so is in fact the opposite of a supply. You can remember it's a "source" because the electrons flow out of it (in a conventional current model), whereas for the "drain" they drain into the transistor.

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Aha I see, makes sense when you put it like that!
Ill get that out tomor and get parts ordered and well see how it goes from there.

Cheers for your help!!

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Any ideas where i can get the ic from..

Number on front is...

5501/1D07021

On the rear is
PHILIP
PINES

Any ideas - done some looking but nothing coming up..

Cheers

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

Are you sure it's "5501" and not something like, "S501"? Could you get a picture of the markings?

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Seems to be

5501A 1D07021
not
5501/1D07021

Still cant find anything tho..

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

The "A" gives me this, a FUJI FA5500A PFC controller IC:
https://cdn.badcaps-static.com/pdfs/...e9f5f9227d.pdf

Available from ~£7
http://www.ebay.co.uk/sch/i.html?_fr...5500A&_sacat=0

[CapLeaker]

Re: Philips 42PFL5522D/05 Not Powering

Google FA5501A it's a power supply control IC.
tom beat me to it.

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

BTW, once you remove the FET and the IC, check the resistors and diodes in the gate area of the transistor. They usually survive but sometimes they can be damaged, if so it would be good to replace them too.

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Ah deadly - thanks!!

Where did you get the FA from tho.?

Will check, then order bits and post results, prob be a couple of days

About to open a new thread on another tv too if you can have a look!!

Thanks again..

[tom66]

Re: Philips 42PFL5522D/05 Not Powering

I know it is a PFC controller, in SO8 package so I typed "top marking 5500A PFC controller so8" and it was one of the top results

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Ah yeah, tricks of the trade sorta stuff!!

[liamoc74]

Re: Philips 42PFL5522D/05 Not Powering

Okay, I got the ic and fet ordered!

Tested all the resistors, all good..altho the one on top left "R604" has different markings on it, 2 little squares..what do these mean!

The diode "D605" is reading 130 with leads each way, that means its bad right.?
Looking at the diode, all i can see is a 0 at the bottom, what does this indicate.?

Also, trying to find info on testing smt caps but not getting anything solid, some people saying ya cant test them in circuit, some say you can but i cant seem to get any readings - anyone guide me in the right direction!!

Thanks