Samsung UE46C7000 Single Verticle Line from Cold boot

[DemonBG]

Hello All,


Ok so i picked up this set yesterday - All of it seems to work other than one small issue; When the TV is cold i get a single vertical line of pixels about half way down the screen which isnt the correct colors.
As soon as the set warms up it completely goes away...

I tried to take a picture but it wasnt cold enough this morning for it to happen.


May be difficult to say, but is this likely to be a panel issue?

Regards,

Demon

[Moreno83]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Is the screen cut in half or just a small line? I would remove the shield and push on the tabs.

[DemonBG]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Just a single line of pixels which is a different color. again, it becomes good within 10 seconds or so...

Is this likely to get worse over time do you think if left untreated or should i tear it down and put some thermal pads on the tab bonds?

[Moreno83]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

It will go worse.
Maybe just leave the tv off and remove the shield. So when its cold and you turn it on you can see if pressing the tabs will fix the problem?

[tom66]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Yes I have seen this fault before. It will only get worse and other lines will appear shortly afterwards.

[DemonBG]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Well thats dissapointing... Is this a Tab bond issue Tom? Is there anything i can do to get more life out of it or slow down the degredation?

Thanks,
Demon

[tom66]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

It is similar to a tab bond issue but it is a failure of the bonding between the IC and the flex that makes the "tab driver". I have tried before to fix it with hot air, but with no luck. It lasted about a 1/2 hour then failed again. (Though on my set the line was there from the start.)

[DemonBG]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

from what i hear, they usually run fairl warm... I might try adding some thermal pads onto the IC's to draw some heat out of them. It may at least slow down their degredation...

Will let you know how it works out.

[tibimakai]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Tom, you should try a C clamp. Just kidding.
C series has panel issues, that is something new.

[tom66]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Every Samsung... no every LCD TV has panel issues.
Plasma too, but far rarer.

[DemonBG]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

I have had a few C series TV's - the 2D version (C6XXX) usually have good panels and poor main boards, the C7XXX and C8XXX are the 3D models which from what i gather have reliable main boards but unreliable panels...

Tom - Will putting Thermal pads between the IC and the frame help prolong the life of the panel? My theory is that it will help both draw the heat out of the IC and put a little pressure on it...

Regards,
Demon

[tom66]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

Tom - Will putting Thermal pads between the IC and the frame help prolong the life of the panel? My theory is that it will help both draw the heat out of the IC and put a little pressure on it...

Well, the failure has already occurred, so it might delay the onset of symptoms... but I don't expect it to fix it. It will only go bad later.

By the way my brother just sent me a picture of his Samsung UE46EH8000 (top-of-the-line Smart 46" FullHD 3D LED TV)…........ the panel has gone bad. Out of warranty by 18 months. I did tell him not to buy a Samsung, and then he goes out and buys another one to replace it. At least, I think I'll be able to get the old one, if only for the spare parts.

[tibimakai]

Re: Samsung UE46C7000 Single Verticle Line from Cold boot

I have seen this, with many people.
They have a broken TV of a certain brand and they buy the same brand again.