Philips 42PFL5432D/37

[sunn1044]

Re: Philips 42PFL5432D/37

Hi guys I have a solid green light but no sound or picture
I replace q 901 on power board replace caps I am getting 12dc going out
Going out of ps but no 24 v at test point can some one help me
To get the 24 v going out
Thank u much

[Abbeyjack]

Re: Philips 42PFL5432D/37

I found one on ebay for $18.95. Ill post results as soon as i receive it. Hopefully it cures the problem. Thanks for all y'alls help.

[Mr Bill]

Re: Philips 42PFL5432D/37

What is the number on the white sticker (DO-xxxxxx)? I have a V420H1-C07 tcon in my spare parts box but the number on the barcode sticker is what is needed to see if its a match or compatible.

[budm]

Re: Philips 42PFL5432D/37

You should look into new T-CON board at this point.

[Abbeyjack]

Re: Philips 42PFL5432D/37

I tried to resolder the piece in question with no change in results. Picture fades as soon as it comes on.

[Abbeyjack]

Re: Philips 42PFL5432D/37

I will solder the joints tonight and see what happens. I hope it's that easy.

[budm]

Re: Philips 42PFL5432D/37

Integrated Circuit

[Abbeyjack]

Re: Philips 42PFL5432D/37

I'm sorry, what is IC?

[budm]

Re: Philips 42PFL5432D/37

Since it start working when you touch that area with probe, I would try resoldering that area first. It can be the MOSFET, or the IC, ETC.

[Abbeyjack]

Re: Philips 42PFL5432D/37

Wow, ok. So does this MOSFET just need replaced? And on the datasheet link which one is it??

[budm]

Re: Philips 42PFL5432D/37

Correction on post 219, it is connected to pin 5, this is the step up power supply for VAA. It runs at real high frequency, 280KHz ~1.08MHz.
The IC is: S8333,

[retiredcaps]

Re: Philips 42PFL5432D/37

Part # 63A3 71Q5Z

As tom66 and budm both mentioned now, it is a mosfet.

http://www.datasheetarchive.com/63A3-datasheet.html

When I don't get clear focused pictures, I can only guess at what the part can be.

Many people don't realize how difficult remote troubleshooting is when we don't have the board in front of us. You are the eyes, ears, etc for us.

[budm]

Re: Philips 42PFL5432D/37

That looks like MOSFET to me too, it is QP17 and its GATE pin driven by UP2 pin 4, it is part of the switching power supply. Can you read the P/N on UP2?
You can see V5.6V input feeding the pin of the inductor LP4, the other pin is connected to the Drain (Middle/tab) pin of the MOSFET, the output Diode Anode (DP21) is also connected to the Drain pin, the Cathode pin is the output pin, so it looks like a Boost regulator.

[Abbeyjack]

Re: Philips 42PFL5432D/37

according to post #170 its a voltage regulator. Of course I am only going by what I read on here, I really dont know what either one are! Im learning as I go!

[tom66]

Re: Philips 42PFL5432D/37

Going by its position I'd say that's a MOSFET not a voltage regulator.

[Abbeyjack]

Re: Philips 42PFL5432D/37

I circled the voltage regulator in question in red in the one photo.

Part # 63A3 71Q5Z


Thanks

[retiredcaps]

Re: Philips 42PFL5432D/37

For clairification, while i am measuring the second voltage regulator, i have sound, green power light, back lights on, no picture.

Pin 1- 0
Pin 2- 5.38
Pin 3- 0

A part number and picture for the above would help.

[budm]

Re: Philips 42PFL5432D/37

How about the pictures of your board, so we may see what is going on with YOUR board?

[Abbeyjack]

Re: Philips 42PFL5432D/37

I have hit a wall. I was following this post here, just to quickly sum up my symptons for you......

I was following along nicely, things were good, then i got to the step where it was asked to measure the pins on the voltage regulators on the t-con board. I measured the first one, which would be the one of the top of the pic.



Post #170


Pin 1- 2.48
Pin 2- 0
Pin 3- 3.25

Exactly what the OP got, and was said it was accurate. cool .

Was going to check the second one( the right side of the pic), went i put the red tip of my meter on PIN 2 it caused a little "zap" and very high frequency sound and THE PICTURE CAME ON!! I fiddled with it a couple times and the picture would go on and off as i was poking it. with the zap and high frequency sound.

I sat back and it stayed on. So, i think i found the problem, although i dont know what i found!!

Could this be a bad voltage regulator? Is it just a bad soldering joint? I have never messed with it, so can joints just go bad over time and need to be fixed?

For clairification, while i am measuring the second voltage regulator, i have sound, green power light, back lights on, no picture.

Pin 1- 0
Pin 2- 5.38
Pin 3- 0

Thank you for reading this and I hope it makes sense.

I was able to measure the second voltage regulator while the picture was on and it was different.

Pin 1- 2.5
Pin 2- 3.5
Pin 3- 0

Please help me understand what's going on.

[budm]

Re: Philips 42PFL5432D/37

On the surface mounted polarized cap, the BAR is positive, you can verify that with the DMM.