Plasma no power 50PFP5332D/37

[rmoody]

Ok, i have this plasma tv and it won't power on for me. When plugged in the standby light comes on and when i press the power button the standby light goes off but nothing appears on the screen. I'm thinking there should be a relay clicking when i press the power button but no such luck. I checked voltages going out to ysus and x board. They appear to be ok and consistent. Kind of at a loss on what to check on the power supply. Needing some help here. Thanks in advanced.
Would love to get a hold of a manual for it too if anyone can help with that. Didn't see one at elektrotanya.

[rmoody]

Re: Plasma no power 50PFP5332D/37

Ok, i found the manual by searching by the chassis number, here it is
I'm gonna read through some of it and if anyone has any input. I'll be glad to listen. Thanks

[PlainBill]

Re: Plasma no power 50PFP5332D/37

Ok, i have this plasma tv and it won't power on for me. When plugged in the standby light comes on and when i press the power button the standby light goes off but nothing appears on the screen. I'm thinking there should be a relay clicking when i press the power button but no such luck. I checked voltages going out to ysus and x board. They appear to be ok and consistent. Kind of at a loss on what to check on the power supply. Needing some help here. Thanks in advanced.
Would love to get a hold of a manual for it too if anyone can help with that. Didn't see one at elektrotanya.

Relays are 19th century technology, this is the 21st century. Most designers have moved beyond relays.

Philips TVs present a difficulty when searching for a service manual. First, go here and locate the chassis number - EJ3.0U PA. Then use that on Elektrotanya. It's the 7th hit.

The usual technique I use is to hook up a signal source - video game, etc - then step through the inputs to see if I can pick up the sound. If I do have sound, I start checking the sustains, especially the fuses on the sustains. If I don't, I check the voltages out of the power supply.

PlainBill

[rmoody]

Re: Plasma no power 50PFP5332D/37

Relays are 19th century technology, this is the 21st century. Most designers have moved beyond relays.

Philips TVs present a difficulty when searching for a service manual. First, go here and locate the chassis number - EJ3.0U PA. Then use that on Elektrotanya. It's the 7th hit.

The usual technique I use is to hook up a signal source - video game, etc - then step through the inputs to see if I can pick up the sound. If I do have sound, I start checking the sustains, especially the fuses on the sustains. If I don't, I check the voltages out of the power supply.

PlainBill

Don't have my remote here with me so I can't go through the inputs. Checked fuses on both sus boards and they are good. Outputs seem fine going toward the sus boards. I'm thinking something in the signal board maybe?? I found that on the smaller board in lower center of tv (Inter-connect board in manual) there is a green led that goes on and off with the push of the power button. That tells me that the keyboard portion is working. It runs to the board underneath the SSB, which I think is the Main board. There's a couple of surface mount fuses there that checked ok too.

[rmoody]

Re: Plasma no power 50PFP5332D/37

From what i've read, A large portion of plasma problems are within sus boards but i'm thinking this one is different. I also tried unhooking each individual sus board and tried powering on and still no change.

[PlainBill]

Re: Plasma no power 50PFP5332D/37

From what i've read, A large portion of plasma problems are within sus boards but i'm thinking this one is different. I also tried unhooking each individual sus board and tried powering on and still no change.

The first step is to check ALL outputs of the power supply - those going to the sustains and buffers as well as those going to the Small Signal Board. You should also check the heat sinks on the sustains; if they are not warm, there is a problem. After that, your options are limited.

Quite simply if you don't have a remote to step through the inputs, or an oscilloscope to see actual signals, you are doing the electronic equivalent of masturbating with sandpaper.

PlainBill

[rmoody]

Re: Plasma no power 50PFP5332D/37

The first step is to check ALL outputs of the power supply - those going to the sustains and buffers as well as those going to the Small Signal Board. You should also check the heat sinks on the sustains; if they are not warm, there is a problem. After that, your options are limited.

Quite simply if you don't have a remote to step through the inputs, or an oscilloscope to see actual signals, you are doing the electronic equivalent of masturbating with sandpaper.

PlainBill

Lmao, well my good meter is with the remote 750 miles away. I may try and program a universal remote to see if that will work. I'm going to borrow a better meter today and re-assure all my PS output voltages are working correctly. I'll also check the heatsinks. To me it doesn't act like it ever turns on when the power button is pushed.

[PlainBill]

Re: Plasma no power 50PFP5332D/37

Lmao, well my good meter is with the remote 750 miles away. I may try and program a universal remote to see if that will work. I'm going to borrow a better meter today and re-assure all my PS output voltages are working correctly. I'll also check the heatsinks. To me it doesn't act like it ever turns on when the power button is pushed.

That may be the case. But even then the question is - is the problem the power supply or the Small Signal Board (which turns on the main power supply).

PlainBill

[rmoody]

Re: Plasma no power 50PFP5332D/37

That may be the case. But even then the question is - is the problem the power supply or the Small Signal Board (which turns on the main power supply).

PlainBill

OK, rechecked and i'm only getting around 15vdc out of the va and vs pins on the power supply. Now i need to find out if it's in the power supply itself or the SSB. I did find 2 bad caps under one of the heat sinks on the power supply, Which of course are a size I don't have and had to order. I'm gonna try to find some temporary working caps to replace the bad one's with for now. I'll also try and figure out what voltages are coming out of the SSB and see if it's something in there. Ysus and xSus boards were cold as ice, never warmed at all. Only center heatsink warmed up on the power supply.

[rmoody]

Re: Plasma no power 50PFP5332D/37

Ok, my previous post i stated that i WAS getting 15VDC from the va and vs outputs on the power board. That was a MISTAKE on my part. I'm getting around 5vdc on both these output pins. I replaced the 2 bad caps on the power board and as i suspected it didn't fix my problem. Still no power to my x & Y boards. I'm guessing this 5vdc is like the tv is still in standby mode maybe? Any suggestions from this point on. Bill would you suspect the SSB at this point?

[PlainBill]

Re: Plasma no power 50PFP5332D/37

Ok, my previous post i stated that i WAS getting 15VDC from the va and vs outputs on the power board. That was a MISTAKE on my part. I'm getting around 5vdc on both these output pins. I replaced the 2 bad caps on the power board and as i suspected it didn't fix my problem. Still no power to my x & Y boards. I'm guessing this 5vdc is like the tv is still in standby mode maybe? Any suggestions from this point on. Bill would you suspect the SSB at this point?

I've been over this quite a few times; one of these days I'm going to bookmark it.

Your power supply has multiple sections, but for our purposes we will discuss only two - the standby and the main supplies. These are on a single board. The standby supply is on whenever the TV is receiving AC power. On most Philips sets it supplies 5VDC (5VSB) to the standby processor on the SSB. When the power button is pressed the SSB sends a signal to turn on the main supply (PS_ON). The SSB then monitors some of the voltages out of the power supply and will shut the main supply down and flash an error code if any of them are out of range. I haven't checked the manual for your TV (real life is keeping me busy), but I believe yours is designed to work this way.

I haven't reviewed the full thread, I'm not really awake yet (my wife thinks I should still be in bed with her ), but if the power LED stays on until you push the power button to turn it off, the SSB is NOT the problem.

I recall someone mentioning a low voltage on the Va output when the main supply was off (or maybe it was the outputs to the sustain); I would have expected 0 volts.

PlainBill

[rmoody]

Re: Plasma no power 50PFP5332D/37

Yes it's strange. There is only around 5 volts on the outputs going to the X and Y boards. There is also a VG pin on this same output and it's getting 15.5 volts. Not sure what the VG stands for though. I don't see a ps_on, on this board. There is a vs_on that doesn't get anything at all. I'm thinking that could be a problem. Check out the new pics here. I explained some things with my pics.

[rmoody]

Re: Plasma no power 50PFP5332D/37

I checked the voltages coming out of the three cables from the PS to SSB and they're all correct according to the PS board.

[tom66]

Re: Plasma no power 50PFP5332D/37

Relays are 19th century technology, this is the 21st century. Most designers have moved beyond relays.

Relays are hardly 19th century technology. They are inexpensive, reliable, and easy to control. Why use anything else?

[rmoody]

Re: Plasma no power 50PFP5332D/37

Well, i put this clunker on the back burner for a while and I finally found a decent price on a power supply so I bought it and go figure, that wasn't the problem. That VS_ON point gets nothing when in standby or when the button is pushed. Does this sound like the SSB to you guys?

[rmoody]

Re: Plasma no power 50PFP5332D/37

Here is an updated photo and fresh readings on the cable from the main logic to the PS. In the first picture you'll see the 5v labels on the right side of the connector. These pins are reading 5.30v That seems to high to me but IDK for sure. The vs_on is setting at a dead 0V. Plainbill stated earlier that the SSB powers on the PS but it also appears that the Main Logic powers on the VS portion. Only one heatsink on the power supply is getting hot which i'm assuming is the 5v standby section.

1. Got a few more specific questions here:
2. Is there anything I can test on the Logic to determine if it's the problem? (It's kinda hard to do much with the tray containing the SSB and Inter-connect board is covering half of it)
3. What should the VS_on signal voltage be?
4. Any suggestions on how to get the 5.30 down closer to 5V to see if maybe the overvoltage is preventing the VS_on signal from powering on?
5. What the hell does the inter-connect board do?

[rmoody]

Re: Plasma no power 50PFP5332D/37

I have found a main board on fleabay for $30 so if that's my problem I'll happily pay that if I can't fix it on a component level. Gonna shop around on shoppjimmy and modlinkus too.

[PlainBill]

Re: Plasma no power 50PFP5332D/37

Here is an updated photo and fresh readings on the cable from the main logic to the PS. In the first picture you'll see the 5v labels on the right side of the connector. These pins are reading 5.30v That seems to high to me but IDK for sure. The vs_on is setting at a dead 0V. Plainbill stated earlier that the SSB powers on the PS but it also appears that the Main Logic powers on the VS portion. Only one heatsink on the power supply is getting hot which i'm assuming is the 5v standby section.

1. Got a few more specific questions here:
2. Is there anything I can test on the Logic to determine if it's the problem? (It's kinda hard to do much with the tray containing the SSB and Inter-connect board is covering half of it)
3. What should the VS_on signal voltage be?
4. Any suggestions on how to get the 5.30 down closer to 5V to see if maybe the overvoltage is preventing the VS_on signal from powering on?
5. What the hell does the inter-connect board do?

My comments in post #6 still seem applicable.

The service manual I referenced above has the schematics and layouts for the small signal board. Don't bother screwing around with the logic board at this time - it has nothing to do with the power supply turning on or not turning on. I seriously doubt 5.3 volts out of the standby supply is the cause of the problem, particularly since the standby voltage is actually 5.2 volts.

As for points to test on the SSB, there are lots of them. I suggest starting on page 43 of the Service Manual - it shows all the power supply paths. The standby circuitry is in the upper left corner of the page. The standby processor is on page 53 of the SM.

PlainBill

[rmoody]

Re: Plasma no power 50PFP5332D/37

Checking pin connector Ij02 on SSB all pins read correctly except maybe pin 13 which is the lamp_on_out pin, it read .247 volts. Thanks for your help Bill

[rmoody]

Re: Plasma no power 50PFP5332D/37

Also just checked stepping through the inputs and never got any sound out of my input device.