I've solved this before but unplugging it. Now I cannot get that solution to work. At one point I unplugged the hdmi and was able to get the cable channels to work. Powered it off, plugged in hdmi, powered devices back on, and the problem started again. How can I fix this?
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if video sources other than your HDMI work t is most likely the main board that is the issue here. 3rd picture shows the main board. If it does not work with any input source you will have to measure the voltages from the power board to the main board.
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I was able to get it to recognize a different hdmi device, but then it powered off again.
TRy something different than your HDMI. It still sounds like it's your main board just needing to checking other input sources
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