General TV board descriptions

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i dont know if my main board is out are the black lights are out. i have a full picture under the black screen i use the flash light test and i have sound.

Then your problem is with your backlights. As with Christmas tree lights, they are connected in series, so when one goes out they all go out...

My sony TV turns off after 10 seconds and then the standby light blinks 6 times. I grounded the back light error wire and my TV was working again temporarily for 2 days. My screen was black again but with a flash I could see a moving picture and sound was working. What could be the problem?

Hisense 58A7100f combo board strike by lightning while it was off but plugged to the mains Socket, no standby light. I'm getting 187v AC in but no voltages on the main board, what else can I check