Panasonic TC-P54S1 Horizontal Black Lines

[CTRacing]

So my tv when black one day and the power light started blinking 6 or 7 times, I can't remember. So I did some research and found that it is most likely the SD and SU boards. So I replaced them. The tv turned on but now has black lines going across it? Could it be a bad A board. Any help is much appreciated!

[tom66]

Re: Panasonic TC-P54S1 Horizontal Black Lines

Just a matter of getting SU and SD cables right. Unplug all orange ribbons on SU/SD, and very carefully seat them. They have two positions. One way is no good. The other gives a little, faint "click". You need the click to have the connector in the right position.

[CTRacing]

Re: Panasonic TC-P54S1 Horizontal Black Lines

I thought that might be the cause so I have removed and replaced the cable several times, but I'll check again when I get home but listen for the "click"

[tom66]

Re: Panasonic TC-P54S1 Horizontal Black Lines

They are very fiddly and difficult to get into position. I have had this problem many times previously after undoing those ribbons.

[CTRacing]

Re: Panasonic TC-P54S1 Horizontal Black Lines

That worked. It took me taking it in and out a million times to find the way to get it to click it. Thanks for the help.

One other thing. While doing this I have noticed a humming coming from the power supply and SC board. Maybe it is just more noticeable now that the cover is off. But is that normal?

[tom66]

Re: Panasonic TC-P54S1 Horizontal Black Lines

It's common with plasmas for a buzzing to be heard with the case removed - once the case is reinstalled it should stop buzzing.

[CTRacing]

Re: Panasonic TC-P54S1 Horizontal Black Lines

So the black lines are gone, but I went to plug in a device and the HDMI ports aren't working. I have tested the device and HDMI cable on another device and they work. Do i have to change an setting to make the HDMI work on the tv? Or what ever surge that blew mu su and sd boards also blew the Hdmi?

[tom66]

Re: Panasonic TC-P54S1 Horizontal Black Lines

Yes, it's more than likely if you had a power surge which damaged the SU/SD that the HDMI went along with it. You can first try a factory reset: hold MENU on set and press MENU on remote, then turn set off.