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You mention in the above that if the board are not screwed…

Customer Question
you mention in the above...
you mention in the above that if the board are not screwed in that you will blow the boards. I have been trying to trouble shoot by replacing every board and nothing is working. I still get a 5 second blink on the logic board LED. I am worried that since noting is screwed in I have blown every board...
Submitted: 2 years ago.Category: TV
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Answered in 6 hours by:
3/5/2016
TV Technician: TV Tech1, Technician replied 2 years ago
TV Tech1
TV Tech1, Technician
Category: TV
Satisfied Customers: 5,316
Experience: 30 Years experience. Authorized Warranty servicer.
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Note what you've done.

1st, IF the YMAIN board was unscrewed and Powered on....that board is likely blown. If the Xmain was unscrewed, those do seem to survive better.

2nd, the RIBBON cable to the YMAIN...if that was disconnected and the TV powered up, the Ymain is destroyed too.

The Ymain is the most susceptible part of your TV set. It should always be screwed in and the ribbon cable must never be disconnected when powered up. The logic board's 5 second blink tells me that's the most likely issue you're dealing with. You see those buffer boards (single/dual buffer??) connected to the YMain? Did you also have those unscrewed/disconnected from the Ymain? BOTH should be connected to the Ymain when powered up if you have 2 of them. If one is connected, and the other isn't...it'll blow the connected one.

So, those are the absolute must-have rules regarding Samsung plasma TVs and testing them. If you've broken any of the above rules, you will need to replace the Ymain and the buffer boards to get the TV to come alive.

Questions? I'll be home this evening if you need more information.

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Customer reply replied 2 years ago
I had everything disconnected when I powered up. I am a total amateur and spend $125 on spare parts that I guess I just blew up. Lesson learned.
TV Technician: TV Tech1, Technician replied 2 years ago

You had to apply power to the board when you turned it on for the above information to be true too. I guess you have to replace the boards that were unscrewed.

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Customer reply replied 2 years ago
I meant everything was unscrewed.
TV Technician: TV Tech1, Technician replied 2 years ago

Alright, replace the Ymain and buffers connected to it.

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Customer reply replied 2 years ago
When I run It with power disconnected to the y main I get 1 second blink. So does that mean the x board is ok? Also, even with a bad y main, should I get any picture? I am getting nothing - total black screen.
TV Technician: TV Tech1, Technician replied 2 years ago

Yes, the X main is ok. No the Ymain /buffers are responsible for priming the panel so the picture appears on the TV panel.

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Customer reply replied 2 years ago
Can the ribbons get damaged when I was starting with boards unscrewed or the ribbons unattached?
TV Technician: TV Tech1, Technician replied 2 years ago

I've never seen those go bad.

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Customer reply replied 2 years ago
I got a new Y main and both buffers. Hooked it all up. Made sure everything was screwed in and all ribbons attached. I plugged the TV in and the led light on the logic board blinked correctly (1 second) 2 or 3 times and then I heard a small pop and it went back to the 5 second blink. I am just about fed up with this project...
TV Technician: TV Tech1, Technician replied 2 years ago

"replace the Ymain and buffers connected to it."

Did you replace the buffers too?

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Customer reply replied 2 years ago
All new.
TV Technician: TV Tech1, Technician replied 2 years ago

That's not good. If they blew that fast, the ONLY thing that can eat those buffers and Ymain would have to be a short on the plasma panel.

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Customer reply replied 2 years ago
Well I think I am done with this project...
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