Samsung 50in plasma has 3 thin vertical line on left side

[umidunnoy]

Samsung 50in plasma has 3 thin vertical line on left side.any help?

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Bad plasma panel; not economically repaired. Shockingly common with these models (B450 thru E450.)

[aaronwt6]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Hey Tom. Just tore apart a 51" E450 series with a broken screen. First Plasma I've seen with tab bonds. That being the case I think it's feasible that one of these with vertical lines could be a bond issue. Any opinion? Here's a pic from the one I tore down.

[aaronwt6]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Basically the X buffers are permanently attached to the screen.

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Interesting, that's new... I suppose it's only time since they started doing that. Most older panels, including the previous year D450 use connectors. Interestingly, I don't see any heatsinking either. The X drivers really do need heatsinks, wonder if this is the reason Samsung panels seem to fail more especially a lot of the E and F series panels.

However, it's still a panel issue. Attached to those ribbons are driver chips, which fail, causing the lines. The diagnosis would be identical for an LCD with same symptoms. The only real difference is plasma uses around 60V for those drivers, whereas LCD uses around 15V. Plasma X drivers are under a lot more stress and tend to fail more often, though overall plasma panels (as a unit) are more reliable than LCDs due to tab bond issues affecting LCDs a lot more. Wonder if we'll see plasmas with tab bond problems soon, though...

[aaronwt6]

Re: Samsung 50in plasma has 3 thin vertical line on left side

I figured you in particular would find this interesting. I was kind of disappointed to see it. Going to lead to tons more ending up in the trash. There were heat sinks on the board that I already removed. Hence exposing the tab bonds.

[aaronwt6]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Whole reason I brought this up. I fixed another Vizio with nearly identical symptoms to this with tab bond problems. Had 4-5 single pixel width lines.

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Actually now you say it I do remember a Panasonic 2012 plasma using tab bond style connections too for the X drivers. I think as long as heat does not present a problem the tab bonds should be fine, but the fact that tab bond issues are still regularly seen on modern LCD panels worries me. The X driver boards are very simple and really very rarely fail, the X driver chips themselves almost always fail first.

[Sevenqi]

Re: Samsung 50in plasma has 3 thin vertical line on left side

I got a similiar Samsung plasma, same issue, thought it should be the x tab bond problem. When I took out of the iron cover against the x board, found the board permanently attached to the panle! and tried to check the tab bond, after a while, I heard a lod sound, one ic burned out. You know what, this was because the iron cover is the heatsink! without it, the ic was overheated. So never do what I did for long time.

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Yes, they really need to be heatsinked or they will fail within short order.

[Clydeuk]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Well I can tell you from working in an authorised Samsung service centre that not only do some of these panels have the X buffers bonded like this, but some of the replacement service panels I had also had the Y buffers bonded to the panel, eliminating any chance of replacing a buffer board :O

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Really? Not surprising nowadays I suppose... Luckily Y-buffer failure is rare today, but it can still happen due to Y-main fault...

[voicewizard]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Bad plasma panel; not economically repaired. Shockingly common with these models (B450 thru E450.)

Hey Tom, I have an LG 60PS11 With a similar problem but I think the lines are little thinner and sometimes totally go away (as long as there's no blue in the picture - if it's dark blue lines, the lines are almost black and are extremely pronounced). Could it possibly be a buffer board? Or do you think it's the display. Is it anyway I can upload for you a picture or 2?

[raimondu]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Do you think the problem with the heatshink transferred over to the Led Samsungs as well?

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Do you think the problem with the heatshink transferred over to the Led Samsungs as well?

LED Samsung sets don't use heatsinks for the drivers. They really should, but they don't. In fact I've only encountered heatsinks on LCD drivers very infrequently, only once on one very old LCD panel.

[tom66]

Re: Samsung 50in plasma has 3 thin vertical line on left side

Hey Tom, I have an LG 60PS11 With a similar problem but I think the lines are little thinner and sometimes totally go away (as long as there's no blue in the picture - if it's dark blue lines, the lines are almost black and are extremely pronounced). Could it possibly be a buffer board? Or do you think it's the display. Is it anyway I can upload for you a picture or 2?

Unfortunately thin individual failed lines on any display, doesn't matter if it's plasma, LCD or OLED, it is essentially always a bad panel.