Panasonic Viera TP-P50S30 Funky Picture Issue

[Prop1]

I did a piggyback post on another person's thread, but got no response, so I'm starting my own thread, now that I can.

TV originally stopped working with no picture or sound with a steady LED power light. Holding the power button produced 14 flashes. Checked all voltages on the PS board and found the Vsus was shorted at the SC board. Ordered replacement and installed. TV fires up, but the picture has a very bright pink and blue splash from top to bottom on each side with a faint ghost picture in the middle, and dark band at top and bottom. LED stays on steady no matter what. Does this sound like an SS board issue? I have attached a picture.

Thanks for your help in advance.

[selldoor]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Check all your cables (with the power off) My guess is the panel is faulty but if it wasnt faulty before maybe the short on the Vsus caused it. You didnt do the repair with is screen flat down did you?

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Check all your cables (with the power off) My guess is the panel is faulty but if it wasnt faulty before maybe the short on the Vsus caused it. You didnt do the repair with is screen flat down did you?

Sadly, I did. The stand got lost in a move and there was no easy way to keep it propped up. You really think that could have done that to the screen?

[Ltank]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Laying a plasma panel down to replace a board should not cause any issues that I am aware of. I have read many sercive manuals and training manuals and I dont recall any warnings. I know they are transported vertically for strength but lcarefully laying one down to replace a board then stannding it up shoulld not damage the panel. My TV service stand is close to a 45 degree angle I think

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Laying a plasma panel down to replace a board should not cause any issues that I am aware of. I have read many sercive manuals and training manuals and I dont recall any warnings. I know they are transported vertically for strength but lcarefully laying one down to replace a board then stannding it up shoulld not damage the panel. My TV service stand is close to a 45 degree angle I think

Most everything I read cautioned about breaking the display glass when laying it down. I was very careful when doing it and had help. Looking more like collateral damage, or what created the initial problem.

[Ltank]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

For a screen that displays that, I would normally suspect the SS board on the extreme right side as seen facing the rear of the set. Sometimes both board fail at same time, that is one takes out the other.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

For a screen that displays that, I would normally suspect the SS board on the extreme right side as seen facing the rear of the set. Sometimes both board fail at same time, that is one takes out the other.

Anything I can check to nail it down, or is this one of those "replace until it works" scenarios? I can get a new SS from Shopjimmy.com for around $40. Not sure if I want to if I can't confirm it is in fact the SS. Everything is properly connected and there are no obvious blown caps. Voltages seem fine.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

I was able to see the display well enough to reduce the brightness setting. It almost looks like tears in a cloth in some areas.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Checked voltages on the SS board, and checked continuity on all the pin 1 to pin 2 on the ribbons going to the panel. Everything was good. Is this sounding like a bad panel?

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Problem solved. The set goes to the recycler on Monday. I've spent enough time on this POS. Glad I didn't pay for it. This has proven to me that my 10 year old Toshiba LCD and my 5 year old Samsung plasma are a hell of a lot better than Panasonic products. I'll stick with what I personally know to be good.

Thanks, to those that replied to my thread...

[tw2005]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

If SS11 is disconnected and you turn it on how does it look?

gives the impression it's a bad SS, but the fact no SOS trips makes it fun.

Have not seen a picture of a Panasonic screen running like that before so best guess is all I have on it.

[tom66]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Checked the Ve voltage and -Vad voltages on the SS and SC boards?
Panasonic > Toshiba > Samsung from what I've seen. One bad product & you say they're no good?

Ve: approx 80V ~ 140V, -Vad: -180V ~ -210V

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

If SS11 is disconnected and you turn it on how does it look?

gives the impression it's a bad SS, but the fact no SOS trips makes it fun.

Have not seen a picture of a Panasonic screen running like that before so best guess is all I have on it.

Black screen with solid power LED. Thanks for your input.

Checked the Ve voltage and -Vad voltages on the SS and SC boards?
Panasonic > Toshiba > Samsung from what I've seen. One bad product & you say they're no good?

Ve: approx 80V ~ 140V, -Vad: -180V ~ -210V

I'm not sure what you mean by Ve and -Vad. I have Vsus going to both boards that is at -215.7 volts, and a 15v that reads 15.5v. There is a power connection that supplies the C1 and C2 boards that reads 55.3v. I disconnected that and the picture came up just like when it's connected. Did I stubble on to something? Thanks for your help.

[tw2005]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Black screen with solid power LED. Thanks for your input.



I'm not sure what you mean by Ve and -Vad. I have Vsus going to both boards that is at -215.7 volts, and a 15v that reads 15.5v. There is a power connection that supplies the C1 and C2 boards that reads 55.3v. I disconnected that and the picture came up just like when it's connected. Did I stubble on to something? Thanks for your help.

P35 which goes to the C boards = Vda, that reading seems about right. be careful with that one, I would not adjust that or muck around with it if the set running or whilst there is voltage present which can be the case even with the TV off as the caps hold charge. i've spiked and destroyed a panel , that voltage goes to the driver ICs on the embedded on panel ribbons.

Ve,(TPVe) you'll find on the SS board, top left there is a marking and arrow pointing to a couple of pads to probe and check the voltage.

VAD, (TPVAD) is on the SC, runs off one of the legs of R838. Should find it near bottom of SC in the middle.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Just measured the voltages. They're definitely out of range.

Ve = 171.1

Vad = 48.2

[tom66]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Ve is high but not having worked on a panny like this it's not impossible I suppose. Vad is definitely bad though. Can you unplug buffer board connectors and see if it rises.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

Ve is high but not having worked on a panny like this it's not impossible I suppose. Vad is definitely bad though. Can you unplug buffer board connectors and see if it rises.

Ok, I performed the isolation procedure and the voltage only changed to 48.7 and the board made a low level buzz.

[tom66]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

OK, is there an adjustment point for Vad that you can see? Might look like a small turn control / turn pot.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

OK, is there an adjustment point for Vad that you can see? Might look like a small turn control / turn pot.

No pot, but after taking a close look at the old and new board side by side; they are not the same boards. The part #s match, but the replacement is more populated with parts.

[Prop1]

Re: Panasonic Viera TP-P50S30 Funky Picture Issue

I just looked on shopjimmy.com and it looks like I bought the wrong SC board. There was no suffix on the board, so I assumed that was the correct board. Turns out that this model takes the board with an AM suffix. I'm going to order the correct one and hope they refund the money for the wrong one.