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Samsung 70 inch tv! Un7069nu00fxza

I'm having an issue with my 70 inch Samsung tv. Un70nu6900fxza Version ya02. I replaced the power supply board but when I turn it on it still cycles and shuts off a couple times. I'll repeat this process with the ribbon cables unplugged, then once I get the back lights to stay on I will plug both of the ribbon cables back into the main board. Then I will get picture. The tv will act normally and function well until I turn the tv off. Then I have to restart the whole process over again.

Posted by Kyle Cota on

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1 Answer

Larry

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You said you replaced the power board, what was the original issue with your TV?

Posted on Nov 24, 2021

  • 2 more comments 
  • Kyle Cota
    Kyle Cota Nov 24, 2021

    I originally thought that it was the issue based on what little research is available. But with replacing the power board I am still having the same issues.

  • Larry Nov 24, 2021

    A TV with your issues is easy to troubleshoot one nice thing about a power board is it can be tested very easily. It needs 5 volt to light the standby lamp, if that's not there replace the power board, when the power button is pushed you should see 3.3 volts at the ps_on terminal of the plug going to the main board, if you don't see that the main board is bad, if you see it the other voltages should be present, if they aren't the power board is bad. Where did you get the replacement power board. If it came from ebay it's possible you received a replacement that's defective. These tests need to be done when the set is not working. The only thing that doesn't make sense is the ribbon connectors shouldn't make the set come on. You can test the backlight section by unhooking the cable going to the main board and on samsung sets the backlights should come on if they work ok

  • Kyle Cota
    Kyle Cota Nov 24, 2021

    Yes backlights stay on when you unplug the cable that runs between the main board and power supply board. I bought the replacement board from ShopJimmy.com.

  • Larry Nov 24, 2021

    That's about the best place to buy a board as they test them before they package them and ship.

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