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No Standby Light - Won't turn on.

Hello,

I have a UN58H5202AFXZA IS01. It recently shut off without a standby light. I concluded the power supply died. Replaced it. 28 days later the new one does the same thing.

No stand by light, won't power on. Seems another power supply failure.

I was told by the place I bought the power supply I need to replace my backlights as they are burning out the power supply. This doesn't make sense to me as they work fine.

Can anyone shed some light? I've already replaced the power supply for a second one. It turns on and works. But I refuse to use it until I can verify the issue.

This is getting expensive...

Thanks

I've attached some pictures of the second board. I no longer have the original, but I can confirm the "burn" marks were located in an entirely different place, but still were on the cold side. I finally got a multi meter to test somethings.

Looking forward to some insight.

Answered! View the answer I have this problem too

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Posted: Mar 15, 2018

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@itzubiquitious since it did work with a new power supply you know that it is the part that is failing. So you do know that you need a new one to at least figure out what happens. Check the power supply and see if you can determine where it has failed, which part etc. That will help to find out what may shortened it out. Post some good images of your boards with your question so we can see what you see. Use this guide Adding images to an existing question for that. I am not sure how the backlight would get the power supply to fail but you do want to check later and see what the voltage supply to the backlights is.

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2 Comments:

I've added some pictures.

TIA

Apr 24, 2018 by Michael

@itzubiquitious check the voltages on CNL802 and CNM803 against the values printed on the circuit board. That would give you an indication of what power is supplied to the backlight etc.

Apr 24, 2018 by oldturkey03

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Samsung Television

No Standby Light - Won't turn on.

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