Samsung UN46C8000XFXZA vertical bars/horizontal lines

[x_orange90_x]

I posted about this previously but didn't get any response, and I have some troubleshooted a bit so I have more info.

The screen is full of horizontal "gaps" or lines that distort the picture badly, and after about 10 seconds of powering it on the screen starts to fill with red vertical bars that take on the horizontal pattern. After the screen filled with the red bars, they instantly vanished and then slowly started to reappear. I initially thought it was tab bonding failure, but after getting down to them and pressing each one I find zero change in the picture. I went into settings and turn on the diagnostic image you can see attached.

I once had a Sony with a bad tcon that did strange lines and colors fading in and out, kind of like a Winamp visualization. I'm thinking the tcon may be bad in this Samsung as well. I know alternatively it could be panel failure, but I don't feel like that's the case as it's fairly uniform across the screen and the bars will appear and disappear which I've never seen a bad panel do.

The tcon is $40 on SJ, but before I decide to order one I'd like everyone's opinion on this. I also plan to resell this tv and if I have to put 40 into it I might not make much of a profit at all.

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

u could get a tcon but premising to seller it must be took from a working smashed screen tv..
it could be a faulty level shifter ic on tcon or a bad diode on panel distrib. board or a faulty gate cof..

[x_orange90_x]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

u could get a tcon but premising to seller it must be took from a working smashed screen tv..
it could be a faulty level shifter ic on tcon or a bad diode on panel distrib. board or a faulty gate cof..

Thanks for the reply! I've found the board on ShopJimmy and that appears to be cheaper than eBay. Do you think the tcon is actually the problem, or one of the other things you mentioned? If i try to resell this tv I think I'd get $100 for it, and if i DO replace the tcon id make about 60 profit.

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

i cannot answer this q., i'm stuck in the same situation, due to high cost of tcon, in my model's tcon some test points appears to report a bad signal, with a simple frequency meter who knows? My suspect is a bad ICE1 on tcon from ST .. but the most clued is the panel.. have u got oscilloscope?

[diif]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

It looks like the panel is at fault some how to me. There is a black band at the bottom of the screen in pics 1 and 2 and in the test image pic 3 that part is a good picture with a bright line above it.

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

i did not notice it, that tells is almost 90% panel fault..

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

🛌🏿 Zzzzzz...

[x_orange90_x]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

I haven't messed with it since you suggested it's the panel. I wouldn't take a chance on buying a tcon that might not fix it. I don't understand HOW panels fail aside from trauma. Is it a factory defect that causes them to fail? What dictates the symptoms they present?

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

ok only to know that you gave up, it's a right choice unless tcon is cheap , you could resell it, or if seller accept return.. these panels fails for one of these reasons, static charge, mains surge, bad tcon circuitry (maybe programmed obsolescence)

[x_orange90_x]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

I'd like to attempt to do this if anyone can help me understand which pins i should and should not cover:

https://m.youtube.com/watch?v=kUWapOBtm0Y
(Skip to 1:15)

I have attached up close photos of my connectors. I don't see any traces going BETWEEN the two connectors, but maybe I'm misunderstanding him.

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

You are out of the road, the defect is not the same..
i can guide you to search for the abnormality i was talkin about, i need close up photo of the ic i mentioned, if you have scope or frequency meter

[nomoresonys]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

Had a sanyo that displayed very similar, was a loose tab bond, "fixed" with a shim.

[x_orange90_x]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

Had a sanyo that displayed very similar, was a loose tab bond, "fixed" with a shim.

I had the frame off and messed with every tab. Zero change. The changes happen on their own, like the red bars fading in, out, resetting. That's why I initially thought tcon.

[nomoresonys]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

My bad, I failed to read your first post,

[nomoresonys]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

Is this LTF460HQ03-A06 your panel number?

[nomoresonys]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

One there for 20 from tv parts today, if it's a match. I haven't dealt with them, from seeing feedback from some members here, seems some like them and some hate them: https://tvpartstoday.com/products/lj...-un46c8000xfza

[nomoresonys]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

Can you post good clear pictures of your panel driver boards, might help to see what all is on those.

[nomoresonys]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

Your display does look a lot like many with the bad diodes on panel driver boards, not sure what your model has on it tho.

[Davi.p]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

"EDIT" button.. this unknown... (!)

[x_orange90_x]

Re: Samsung UN46C8000XFXZA vertical bars/horizontal lines

I will try to get that info and pics tonight.

One there for 20 from tv parts today, if it's a match. I haven't dealt with them, from seeing feedback from some members here, seems some like them and some hate them: https://tvpartstoday.com/products/lj...-un46c8000xfza

Mine is 2010_R240S_MB4_0.5 and the one you linked ends in 1.0. I don't know what the difference would be, but I imagine that's the revision number.