Replaced both boards, still no display, Samsung 55UN6900

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Samsung Television

Repair guides and support for your Samsung TV.

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Ed OBryan @huskerhawk

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게시일: 2020년 12월 7일

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Replaced both boards, still no display, Samsung 55UN6900

Was given this TV when it wouldn’t come on and would love to get it working. It had audio and standby light, I replaced both boards and nothing changed. I’m not sure what the next option would be as I can’t tell what is left to replace related to the LEDs, or how realistic that might be. I can’t see anything doing the flashlight test, but I may not be doing it correctly. I don’t have a working multimeter at the moment but will get a new one soon. Also, the power button cover is broken off over the power LED, (came to me that way), could this have any impact? Thanks for any help!

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oldturkey03 @oldturkey03 평판: 791.3k 1.1k 899 2.4k · Answer 1 · 2020-12-08T21:05:45-07:00

oldturkey03 @oldturkey03

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게시일: 2020년 12월 8일

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@huskerhawk disconnect the main board from the power board and check to see if the backlight comes on. Since you already replaced the boards it is entirely possible that this is a backlight issue (possibly failed backlight strips). Let us know what you find.

Here is a great video about the flashlight test.

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Thanks for the advice, unfortunately I don't get anything different when I disconnect the main board.

Ed OBryan 의 2020년 12월 8일

Okay when you disconnect the main board from the power board (TV on), the backlight should turn on. Do you have a multimeter? Can you check the voltages from your power supply to your backlight LED's. Right now it sounds even more like a failed backlight strip. That's good, well not really but better than the alternative which would be a bad panel :-)

Something odd....can you post a close up of your power board?

oldturkey03 의 2020년 12월 8일

I was wrong, there is an image with the flashlight test. I added a picture of my power board.

Ed OBryan 의 2020년 12월 9일

@huskerhawk sure sounds like your backlight now. Replacing the backlight strips is actually pretty straight forward. Just make sure that you keep the panel nice and flat so it does not flex. To find a replacement you will need teh exact model number for your TV. Something like Samsung UN55NU6900FXZA

oldturkey03 의 2020년 12월 9일

@oldturkey03 Thanks again for your advice. I see single strips and pairs for sale for my TV, do I need a pair, or just get one and determine which one is bad?

Ed OBryan 의 2020년 12월 9일

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Samsung Television

Replaced both boards, still no display, Samsung 55UN6900

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