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Old 06-28-2021, 05:22 AM   #1
Electrix78
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Default Samsung UA50KU6000 50" Smart TV

Hi all,

Firstly, I am no technician so I am not sure what I am looking at, but I am handy with a soldering iron and will give most things a crack. I have a friends tv and it is stuck in a boot loop. Comes up with "Smart TV" on the screen and then cycles over and over. Now I am assuming that it is the control board doing this not the main power board. Would I be right? how can I determine which board is faulty. I have tried looking for schematics and drawings but cannot find anything. I am at the mercy of everyone here for help.

The capacitors on the main power board look fine, no scorch marks or bulging tops. I have checked for dry joints and broken tracks. Anything else?

I have attached two photos if this helps determine what I should be looking for.

Thanks everyone.
Attached Images
File Type: jpg 20210628_211252[1].jpg (1.30 MB, 30 views)
File Type: jpg 20210628_211307[1].jpg (820.4 KB, 15 views)
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Old 06-28-2021, 03:14 PM   #2
sintv
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Default Re: Samsung UA50KU6000 50" Smart TV

If you disconnect the lead between the 2 boards the set and backlights should come on. This means power board and screen is okay and your fault is on the main board.
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Old 07-01-2021, 05:33 AM   #3
Electrix78
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Default Re: Samsung UA50KU6000 50" Smart TV

Thanks sintv - I did as you suggested and sure enough the back lights did come on. So my next question if I may, is what should I look for to determine the problem on the LCD board? Any suggestions?

Thanks
Greg
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Old 07-06-2021, 07:17 PM   #4
Electrix78
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Default Re: Samsung UA50KU6000 50" Smart TV

Quote:
Originally Posted by sintv View Post
If you disconnect the lead between the 2 boards the set and backlights should come on. This means power board and screen is okay and your fault is on the main board.
Hi Sintv

I have identified what I think is a voltage regulator, looking at the component in question, the meaurements are
Drain/Gate - 11.1v on / 0.7v off
Drain/Source - 12.5v on / 0.6v off
Source/Gate - 1.46v on / 0.00 off

Do these numbers mean anything? I was thinking that if the same voltage is not on the output side as it is from the input, then something is wrong. Is this correct?

Thanks
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Old 07-08-2021, 04:26 AM   #5
Electrix78
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Default Re: Samsung UA50KU6000 50" Smart TV

Anyone else able to assist a newbie?
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Old 07-11-2021, 01:02 PM   #6
sintv
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Default Re: Samsung UA50KU6000 50" Smart TV

There a firms on Ebay who will repair the board for your fault. I think they replace one of the large ICs at 2 and 5 oclock of your arrow
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