Philips 42PFL5432D/37

[PoteauPets]

Re: Philips 42PFL5432D/37

Part numbers

ANE 8815
AECS 250
0719

6343
74J3Z

Will post readings momentarily.

[retiredcaps]

Re: Philips 42PFL5432D/37

1) I marked the two voltage regulators. The pics are almost good enough for me to make out the part numbers, but I can't. So please list the part numbers.

2) To measure them, see my bookmarked answer at

https://www.badcaps.net/forum/showpo...13&postcount=3

Use a ground screw on the t-con for your black probe.

3) Obviously, we want comparison readings of these two when the TV is working and when it is not.

[retiredcaps]

Re: Philips 42PFL5432D/37

BTW, it is not uncommon for a TV to have multiple problems in addition to the bad caps found earlier. Most of the time, it is just one thing.

[retiredcaps]

Re: Philips 42PFL5432D/37

Where and what exactly is the T-Con???

https://www.badcaps.net/forum/attach...5&d=1327778579

PlainBill also mentioned it as a possibility way back in post #20.

It stands for timing control.

[PoteauPets]

Re: Philips 42PFL5432D/37

I have a new digital multi-meter. It's the same one TBuch bought in an earlier post, with which I tested all the diodes.
Where and what exactly is the T-Con???

[retiredcaps]

Re: Philips 42PFL5432D/37

1) My next best guess, and it is a guess, is that something on the t-con may be overheating.

2) A replacement is at

http://www.ebay.com/itm/220939145281

3) To verify if that is the case or not, try to think of a way just to keep this card cool (instead of the entire backside of the TV). This may involve some "duct" work or portable hair dryer on the cool setting.

4) There is a voltage regulator on the board (maybe two), but I'm afraid your analog multimeter may not provide enough precision to determine if it is bad or not. A voltage regulator should be within 1% of it specifications.

Now if the voltage regulator is "obviously" bad, then a 3.3V regulator might read 4.5V or 2.4V which is enough to spot with an analog multimeter.

[PoteauPets]

Re: Philips 42PFL5432D/37

OH, and with the help of TBuch, I tested all the diodes while waiting for the last shipment of caps. They all checked out fine.

[PoteauPets]

Re: Philips 42PFL5432D/37

Hey Guys,
I've been away for awhile taking care of my husbands elderly parents, but am still having TV issues.

Here's what I have done so far :

1) Re-capped bloated caps on Scaler board. (I think it was only 2 or 3)
TV would still shut off after 20-30 mins or so.
2) Re-capped most all caps on the power board
TV still had same issue, but discovered that if we kept a fan running
behind it it would stay on all day & all night.
3) You guys had me doubt my original solder joints on the scaler board, so I went back and removed them and capped them all over again.
4) Still same problem, only fix so far is to keep the fan on.
5) Ordered more caps, (arrived Tues) re-capped the entire scaler board.
6) Still same problem, only stays on with the fan running.

HELP !!!!!!!!!!!!!

[tbuch]

Re: Philips 42PFL5432D/37

Mr. Bill,

Those two diodes were good after testing them off the board. I did what was posted in another board and used the Radio Shack Diodes to see if this fixed it and sure enough it did. I have the needed diodes on order and will replace them as soon as they come in. ~ Now I am testing to see if I have the problem of the set turning off when it heats up...Fingers crossed!! Thanks you guys for ALL your help!!!!

[Mr Bill]

Re: Philips 42PFL5432D/37

Doide D925 reads 1 the other way
Diode D912 reads the same both ways... 001

D925 would indicate its good. You should get a value one direction and either "0L" or "1" the other way if you reverse the probes. Desoldering and checking is still your best bet. Just try to not mess them up to bad incase they are good. That way you can atleast put them back.

[tbuch]

Re: Philips 42PFL5432D/37

Doide D925 reads 1 the other way
Diode D912 reads the same both ways... 001

[tom66]

Re: Philips 42PFL5432D/37

I also tested a few other diodes;

Diode D925 is reading 096
Diode D912 is reading 001

Are these bad or are the just appear bad because of the other two bad diodes?

Same both ways?

[tbuch]

Re: Philips 42PFL5432D/37

Mr Bill, thank you for all of your help. I will test these out of the board as well.

[Mr Bill]

Re: Philips 42PFL5432D/37

I also tested a few other diodes;

Diode D925 is reading 096
Diode D912 is reading 001

Are these bad or are the just appear bad because of the other two bad diodes?

you might have to desolder the diodes to get an accurate reading but my monies on the ZD902 & ZD904 being bad. 3 or 4 times now in about 30 days i've seen the chirping transformer on a philips lcd. It seems the diode failing with the capacitors on this power supply design is starting to become problematic.

[tbuch]

Re: Philips 42PFL5432D/37

I also tested a few other diodes;

Diode D925 is reading 096
Diode D912 is reading 001

Are these bad or are the just appear bad because of the other two bad diodes?

[tbuch]

Re: Philips 42PFL5432D/37

tom66, that is what I thought, I checked some others and they read up on the 600 one way and 1 the other.

[tom66]

Re: Philips 42PFL5432D/37

Just got done checking diodes;

Diode zd904 reads 034 (both directions)
Diode zd902 reads 061 (both directions)

These are the two diodes that are on the power board.

Both are shorted.

[tbuch]

Re: Philips 42PFL5432D/37

Just got done checking diodes;

Diode zd904 reads 034 (both directions)
Diode zd902 reads 061 (both directions)

These are the two diodes that are on the power board.

[tbuch]

Re: Philips 42PFL5432D/37

OK great, Thanks!!!

[retiredcaps]

Re: Philips 42PFL5432D/37

That particular multimeter (Equus) will work, right?

For the purposes of fixing this TV, it will work fine. It has a diode test function.