Hello everyone. So this time I come less asking for advice and more with a warning. As far as I can tell this is the first post for this model.
I picked up a Samsung UN40NU7100FXZA from a supplier the other day, build date January 2020. I checked it before purchase to find there were only a few LEDs working. Where they were the diffusion of light looked "abnormal" but the picture was obviously still there.
I disassembled the TV. See what I found in the pictures below.
The LEDs upon the right side of the TV had obviously been so hot they melted themselves in to the main light diffusion panel! You can see their impression in the diffuser! Furthermore the lower part of the diffuser is heat deformed and appears partially melted! There are cracks radiating in to the diffuser from a couple of the LEDS!
Based on the design I see I can also see every TV of this model having this problem.
This said I have one question....does anyone believe an LED current adjustment and turning the backlights down are enough to prevent a repeat failure?
I'd say with this model if you see ANY CHANGE in the diffusion of light at the bottom of the screen you may be having this problem. Also, I think once the change in diffusion has started the main diffuser panel is already damaged to the point the TV isn't worth fixing.
In the absence of a fix the most reasonable work-around appears to be turning the backlights down to the lowest possible practical setting.
It's sad to see Samsung not thinking ahead. A potential failure like this should have been obvious.
I picked up a Samsung UN40NU7100FXZA from a supplier the other day, build date January 2020. I checked it before purchase to find there were only a few LEDs working. Where they were the diffusion of light looked "abnormal" but the picture was obviously still there.
I disassembled the TV. See what I found in the pictures below.
The LEDs upon the right side of the TV had obviously been so hot they melted themselves in to the main light diffusion panel! You can see their impression in the diffuser! Furthermore the lower part of the diffuser is heat deformed and appears partially melted! There are cracks radiating in to the diffuser from a couple of the LEDS!
Based on the design I see I can also see every TV of this model having this problem.
This said I have one question....does anyone believe an LED current adjustment and turning the backlights down are enough to prevent a repeat failure?
I'd say with this model if you see ANY CHANGE in the diffusion of light at the bottom of the screen you may be having this problem. Also, I think once the change in diffusion has started the main diffuser panel is already damaged to the point the TV isn't worth fixing.
In the absence of a fix the most reasonable work-around appears to be turning the backlights down to the lowest possible practical setting.
It's sad to see Samsung not thinking ahead. A potential failure like this should have been obvious.
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