Hisense 58H6550E red light on with black screen
I have a Hisense 58H6550E smart TV, and about a week ago the screen went black. Originally, when I unplugged it and plugged it back in, the red light would come on, and once I pressed the power button the red light would turn off and stay off. If I pressed the power button again it would remain off until I unplugged it again and plugged it back in. I saw on a forum that this might mean the main board was bad, so I purchased a new main board and installed it, and now the problem is slightly different. Now when I plug it in, the red light still comes on, but when I press the power button the red light goes off for 3 seconds and then comes back on. There is still zero picture and zero audio. I’m not sure if this means the new main board I purchased is also defective, or if the issue is something else entirely. Does this sound like it’s actually a main board issue? And if it might be something else, what steps could I take to diagnose the issue?
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