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red standby light will flash red but no picture

I have a Samsung UN55HU9000FXZA that won't turn on. The red standby light will flash red and rapid flash when remote is pressed, but no picture. When I disconnect the One Connect box, the TV screen shows a pic of an unplugged One Connect box, then once I plug the box back into the TV, the screen goes black again. Tried replacing the One Connect box and cable, no luck. I also popped off the back of the TV and checked all the caps and they all look great. I'm now at a loss....any help from anyone would be great.

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kthompson64d  This “TV screen shows a pic of an unplugged One Connect box “ make it sounds like that either your TV cannot read the box or the box does not get any input signal. Double check the setup of your One Connect box. Here are the instructions Installation.pdf. Check the cables as well, make sure they are connected right between the box and the TV.

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I tried setting up the One Connect box exactly like the manual you sent me the link to with no luck. I tried both One Connect cords and both One Connect boxes with same result. Any further ideas?

完成的

I know it's an old post but in case you're still trying to repair, sounds like a faulty Main Board when tv doesn't respond to remote commands but can see the IR working. I had same issue then replaced it and voila!

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