Philips 50PFP5332D/37 Faulty Power Supply

[Mr Bill]

This is the same tv i got a month ago that had several bulged caps in the power supply. I recapped with panasonic FM caps. The tv worked fine until yesterday. I turned it on and the picture looked horrible. Almost like the brightness was turned all the way up. The tv ran for about 30 seconds before the power supply went into protection mode and shut down. The board on the power supply was flashing a code 1 which is VS. So i unplugged the tv for a minute before trying again. It turned back on. I quickly put my meter on the VS port on the power supply and the VS voltage was pretty erratic. It would fluctuate from 192v to 218v. Its supposed to be 207v. It almost seems that the voltage is fluctuating with the picture the screen is displaying.

So can the power supply be contributing to the horrible picture? I think if the voltage is too high or low the "sparkles" can appear, not sure about much else.

Or do you think the x-main or y-main has failed/failing causing the power supply to not give me a stable reading?

Is there anything i can do to somewhat rule out the power supply?

I can post a photo of the display if anyone would like to see.

Thanks

[PlainBill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

The quick and easy test is to disconnect the power cables to both the X and Y mains (with power off, of course), then turn on the TV and measure Vs onat the power supply.

PlainBill

[Mr Bill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

With the x and y mains disconnected i'm getting a solid 213.1 volts. I can dial the voltage up but it won't come down below the above 213v.

[Mr Bill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

With the y-main plugged in i was able to dial it to 207v. I then plugged in the x-main. The picture was the same as last night. After about 10 seconds the VS voltage started bouncing (albeit not as bad). I did notice that the main logic is buzzing. I thought it was the y-main or y-buffer buzzing but with it disconnected that sorta rules it out.

The main logic "could" give me the bad display but i'm still puzzled on the voltage fluctuations.

[rmoody]

Re: Philips 50PFP5332D/37 Faulty Power Supply

The Main could be pulsing the VS_ON function on and off, Check the voltage of it. It's on the bottom left of the PS or the 1st or 2nd pin on the left side of the plug that goes to the Main logic.

[rmoody]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I've still got my big hunker sitting on my kitchen table. My wife gets more furious every day.

[PlainBill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I've still got my big hunker sitting on my kitchen table. My wife gets more furious every day.

It may be time to remind her that some men play golf all weekend, other men are couch potatoes with the TV remote firmly grasped in their hand. Others drink, use drugs, beat their wives, or have affairs. There are thousands of women who would love to have a husband whose only vice is fixing things.

PlainBill

[Mr Bill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I've still got my big hunker sitting on my kitchen table. My wife gets more furious every day.

I'm getting 3.239v (stable) on VS_ON connector. I did notice that the one transformer in the upper right corner (yellow box) is buzzing pretty bad. With my meter on the VS port on the supply the volts bounce everytime this transformer hiccups. Its kinda doing a buzz then a low sound zap followed by more buzz.

This is the tv that you have 2 power supplys for?

[rmoody]

Re: Philips 50PFP5332D/37 Faulty Power Supply

This is the tv that you have 2 power supplys for?

It is, I have a spare. Mr. bill can you do me a favor and check the relay signal line and tell me the voltages during standby and when it's powered on.I would appreciate it.

[rmoody]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I know it PlainBill, She likes that I work on stuff she just wishes I had somewhere else to do it. She loves it when I do fix things and she usually gets the latest and greatest gadgets. I'm always working on something whether it be computers, tv's, ipods, iphones, or whatever other new adventure I feel like getting into.

[Mr Bill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

It is, I have a spare. Mr. bill can you do me a favor and check the relay signal line and tell me the voltages during standby and when it's powered on.I would appreciate it.

If your referring to the connector that goes to the main logic (CN8002). I'm getting 4.90v in standby and .029 tv on.

[Mr Bill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

Here is a pdf of 50HW-YD05. This should be the screen you have or atleast its the same on mine. Anyways, it gives some info on the green leds on the back. And gives you a little check to rule out the ssb which i believe plain bill was leaning on in your other thread.

According to this pdf the 3.2v i was getting with the VS_On pin indicates a PSU or other PCB's on the panel.

[rmoody]

Re: Philips 50PFP5332D/37 Faulty Power Supply

If your referring to the connector that goes to the main logic (CN8002). I'm getting 4.90v in standby and .029 tv on.

Yes, it's the 4th pin (going left to right) I'm only getting 2.84V on that pin. HMMMM

[uberplasma]

Re: Philips 50PFP5332D/37 Faulty Power Supply

It may be time to remind her that some men play golf all weekend, other men are couch potatoes with the TV remote firmly grasped in their hand. Others drink, use drugs, beat their wives, or have affairs. There are thousands of women who would love to have a husband whose only vice is fixing things.

PlainBill

truer words have never been said - beautiful Plain Bill, pure genius!!! Wife will get a card with these words

[multimeter]

Re: Philips 50PFP5332D/37 Faulty Power Supply

It may be time to remind her that some men play golf all weekend, other men are couch potatoes with the TV remote firmly grasped in their hand. Others drink, use drugs, beat their wives, or have affairs. There are thousands of women who would love to have a husband whose only vice is fixing things.

PlainBill

pure class with a hint of genius....

[PlainBill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I know it PlainBill, She likes that I work on stuff she just wishes I had somewhere else to do it. She loves it when I do fix things and she usually gets the latest and greatest gadgets. I'm always working on something whether it be computers, tv's, ipods, iphones, or whatever other new adventure I feel like getting into.

Workspace is always a critical issue. My wife and I both remember our fathers irritating our mothers by dragging something in and working on it on the kitchen table. Of course, in those cases it was usually a part for a tractor or car.

I point out to my wife that while I have several work surfaces, they are usually unusable because SOMEONE dear to me will fill it with something she doesn't need at the moment.

PlainBill

[tom66]

Re: Philips 50PFP5332D/37 Faulty Power Supply

That green object looks like a PFC inductor.

If it is buzzing in time with the Vs going up and down, it could be that the PFC capacitors (the 450V ones) are open circuit (one or both) or low capacitance. The failure mode of the big capacitors is not usually an increase in ESR (at least not by much), but a decrease in capacitance.

Or, it could simply be caused by the Vs rail drawing excess current because it is trying to charge the 4,500uF-odd capacitance attached to it. Maybe the potentiometer is open circuit or high resistance?

[Mr Bill]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I really need to invest in a capacitance meter. So should i replace all 4 of the big ones. I need to place an order through digi-key for a 17" acer monitor i found.

[tom66]

Re: Philips 50PFP5332D/37 Faulty Power Supply

No, I would look for other problems before replacing those, as they are only one of a few causes. When those caps go open circuit, it usually blows up a MOSFET, but they could be dry or low capacitance and cause the problem.

[rmoody]

Re: Philips 50PFP5332D/37 Faulty Power Supply

I really need to invest in a capacitance meter. So should i replace all 4 of the big ones. I need to place an order through digi-key for a 17" acer monitor i found.

I picked up a fairly cheap BK Precision meter on fleabay. It works well but has to measure out of circuit in most cases.