Panasonic tcp42s30 7 Blink Problem

[SCITOMMY]

Hi,

I have a Panasonic Plasma TCP42S30 (2011) TV that went out a week or so ago. The picture went out and when I turned it back on I had a solid red LED light, but no picture (no signs of dimming etc).

After diagnosing the problem I came to the conclusion I had a shorted SN board (mostly because of unplugging the SN board gave me 7 blinks and everything else I still got a solid LED).

So I sent it to a repair person on Ebay who specifically fixes these boards and when he received it said the SN board had 4 shorted Mosfets. He fixed the board, shipped it back.

I got it back today, installed the repaired board. Hooked up everything, (even new screws), everything tight. The TV fired up normally, but with 3 horizontal black bars across the screen (about 2 inches wide).

Everything else looked good, green LED on both SN and SS boards, low buzzing from power supply, A board looks fine etc.

So I looked online about the horizontal bars and found it's commonly caused by ribbon cables to the SN board that aren't seated correctly.

So I go and reseat the first ribbon cable and the top 1st black bar goes away. I then reseat the next cable and the 2nd bar goes away. I'm in the process of taking out the 3rd ribbon cable to reseat it and the TV shuts down. I power back up and get no picture and 7 blinks.

The TV has been powered on the entire time throughout the process (about 10-15 minutes of a normal picture with black bars) until it shuts down.

I then try to diagnose the 7 blink problem and find out that the SN board has once again been shorted somehow.

It doesn't matter which cable I unplug power from the SN board, SS board, I still get 7 blinks.

Please give me some direction experts What's my next step? Sending the SN board back to get repaired for the 2nd time?


Thanks,

Tommy

[SCITOMMY]

Re: Panasonic tcp42s30 7 Blink Problem

I just got some information on a possible solution and he said I most likely shorted a Driver IC (on the SN board) by crossing the connector in the process of reseating the ribbon cables with the TV powered on.

Does that seem feasible to any experts here?

Thanks.

[tw2005]

Re: Panasonic tcp42s30 7 Blink Problem

If you attempted to reseat the panel ribbons with it running, most definitely.

And here's an example of Dave, a TV repairer making that exact same mistake by his own admission. he makes very interesting repair videos too.

Dave TV repair, Grants Pass

[SCITOMMY]

Re: Panasonic tcp42s30 7 Blink Problem

Thanks for the confirmation and video tw2005. Very helpful.

I guess I'm an idiot for trying to reseat these ribbon cables with the TV powered on. I usually never mess with anything with the power turned on, but looking at the black bars disappear while reseating the cables in real time was the lazy way and it's ultimately going to cost me another SN board fix.

[tw2005]

Re: Panasonic tcp42s30 7 Blink Problem

yeah, it hurts. I have not met anyone who's perfect yet, it's a hard lesson to learn.

maybe fly the sympathy flag and try and get a discount on the next board.

Anyway, if TV guy can make that mistake so can anyone. I bet the board was a bit pricey, that the bad part of it.

[SCITOMMY]

Re: Panasonic tcp42s30 7 Blink Problem

Yeah, this particular SN board is out of stock everywhere. The repair on these boards are going for $90-100 on ebay. It was a costly mistake (to me anyway).