I purchased a used Samsung TV model UA65JS9000W recently knowing it had an issue with the screen. When switched on the picture was bright both sides of the screen but a little darker in the middle of the screen. Thinking this was the back lights (side mounted LCD strips) I replaced these, however the issue is still there. I am now thinking it may be a TCOM issue, but am not sure, any advice on this would be appreciated. Also whilst changing out the back lights I noticed the the thick clear plastic sheet (maybe 1.5 to 2mm thick) below the diffusers there is cracking (up to 75mm) on the sides and there is evidence of burning from the LED's, are replacements available?
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This is an actual photo of my TV rather than someone else's photo who had the same issue that was posted on another forum, however they did not any responce to their issue. -
Your sheet was unusable because of the cracks. No getting around that. When changing out backlights on Samsung, once you put the lights in and the diffuser sheet, before you put the screen back on... You disconnect the main board connector from the PSU and plug it in. This will turn the lights on and you can see any defects on clips that aren't connected that will cause bright spots on the screen..
Those cracks will always show that you need to replace the diffuser sheet as well and you can't really buy them in my experience. And if you can they're super expensive. So usually you find a broken screen TV that didn't have the lights melt the shield and you transplant it off of that insteadComment
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Thanks for the feed back. Do you know what material the thick clear sheet is made from? If I can find this out and it is not some special material I should be able to have a local supplier cut a sheet to size and use this as a replacement. I guess my main issue is the darker centre of the screen.Comment
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I'm now convinced from what you said that the darkening of the screen is caused by the diffuser sheet. I will try my local TV repair shop to see if they have any good secondhand sheets available. Not a great design on Samsung's behalf.Comment
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This is par for the course on edge lit displays. First thing you have to on these technologies is to turn the brightness DOWN. As far down as you are willing to endure in your TV watching. The LEDs burn way too hot for the diffuser/reflector material to withstand. As the resistance of the LEDs increase (with age) the hotter they get. They begin to char and often crack he diffuser/reflector. Nothing can really be done to save it once this happens. You will need to find a salvage TV (the same model TV) and see if you can pull the reflector/diffuser from it ...it its any good. I heard of ppl wanting to take the sheet from a larger TV and cutting it to size. That MAY work if your cuts are not on the side where the LEDs are. You'd have to be lucky to find what you are looking for though. I kept a 65" SUHD for almost a year waiting for a donor TV and never found one. Then i parted mine out and stored/offered the diffuser/refector to anyone who may want to use it for a smaller TV. No one ever inquired.
Good luckComment
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There is only 2 TVs Samsung made with these edgelit panels on the side. The JS series you have and the HU series the year prior. Every other tv edgelit is lit from the bottom. You may get lucky but usually TVs this old all the diffusers are in bad shape some way or another. Will never be perfect againComment
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I just got a HU series one with edgelit like this. Pain in the ass!!! To tear down. I got there, and the sheet was cracked. I put the screen back took the parts off and tossed it. No way I'm finding another one of these.. been a year and this was the only one I've found. Story is right, impossible to find for most.Comment
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I believe have a similar screen problem for my SAMSUNG LN40B530P7F. See photo. It was supposed to show a pure grey picture but it ended up showing brighter on the left (lower-left corner the brightest) and very dark on the right.
Not only the left side of screen is brighter but the contrast is better. When used as a computer monitor, I could recognize the texts displayed on the left but couldn't recognize those very well from center to the right.
I thought it was LCD panel issue. I tried a new T-con board, but same issue. I made voltage measurements here and there, and broke a flat cable connection, leaving a vertical black band on the screen. I gave up.
Could it be the same diffuser issue? Thanks for any comments for this.Attached FilesComment
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That looks like a screen fault. Diffuser is a totally different thing, a perfect picture would be behind it still. Looks like a plasma TV anywayComment
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I hate threads hijackers.. anyway (to the OP) i think someone else put the hands inside it before you, not a technician surely, the fresnel sheet is probably upside down or more probably the sequence is not right.. usually the thickest behind, thickness decreasing towards the front..Comment
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