Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

[aaronwt6]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

Any chance that the buffers got damaged when the SC failed? Nothing tests shorted and the guy said the picture was perfect up to the moment it died on him. I do see that some of the other repair kits come with more diodes and FETs than the one I got. However, seems the 6 I replaced along with the 4 resistors is the most common.

[aaronwt6]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

Parts replaced were:

Q402
Q403
Q422
Q423
D401
D421
R402
R403
R422
R423

No parts should be missing that I know of. Pretty sure no one else had opened the TV prior to me.

[aaronwt6]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

Not sure if this is clear enough. Again, I'm at work until this evening so this is what I took last night.

[tw2005]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

Actually that issue is only where the SD board drives the panel.

[tw2005]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

close up Picture of the SC repaired please. Also location of parts replaced. Any smd resistors missing?

[aaronwt6]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

TV is the same as the 50" and 55" version internally.

https://www.badcaps.net/forum/showth...ght=TC-P50ST30

Like I said, my main issue is my time restraint in taking it to the in-laws for Christmas. Certainly don't mind buying a part if I need to but it's going to have to be by tomorrow at the latest.

[aaronwt6]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

No scope Tom. I actually just asked your advice on getting one a few days ago but it won't happen until at least after the 1st of the year. I won't be able to dig back into it until this evening (8-9 Eastern Time US). I will start by checking all the voltages. Certainly wouldn't be surprised if there's an additional issue on the SC board since it was blown and I've just repaired it.

[tom66]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

Looks like over-diffusion. Try checking Vsus; should not be too high. Could also be Vad issue on SC board if the set-up ramp is stunted, or Ve on SS board, do you have an oscilloscope?

I swear we've seen something like this before on this forum - not sure what it ended up being.

[aaronwt6]

Re: Panasonic TC-P46ST30 Fixed SC Board But Still Have a Display Issue

Oh, one more thing. In the last picture, I tried to show what appears to be temporary image retention. Any lettering or sharp edges on a picture that stays up for more than a couple seconds is leaving blue spots on the screen for 5-10 seconds. I'm sure that's related to the entire problem.

Thanks again for the help!!

[aaronwt6]

I have the smaller twin here to my personal TV. I'm trying desperately to get it going to give to my in-laws for Christmas next week. The TV had a shorted SC board which I managed to fix last night with a repair kit. Tightened loose screws all over the place when I re-installed the board. Powered it up and was very happy to see the menu pop up. However, upon viewing for a minute I realized that there was a blue haze all over the screen. Especially on dark scenes. It also started out with a spot that was much worse in the lower right corner but that improved after a few minutes. The haze however remained. I'm at work now and cannot troubleshoot but was wondering if anyone had any suggestions. Unfortunately, the repair kit took forever to get to me so if I don't order any additional parts by tomorrow I don't see having this ready to leave town with me next Tuesday. Thanks in advance for any assistance and I always appreciate the input and advice.