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Plain ole user
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11,121 Posts
I would start with simple observation. Carefully remove the cover and look for loose connections.
 

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Plain ole user
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11,121 Posts
Check your manual for the meaning of that LED combo.
 

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Plain ole user
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11,121 Posts
What is nm?

Board replacement is not difficult but the problem is getting the right board and getting a good one. It may need alignment or configuration when you get it.

My only other idea would be some troubleshooting of the circuit that detects the signal and the various power supplies and regulators in the set.
 

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Plain ole user
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11,121 Posts
As I said, the next step for me would be to do some troubleshooting. You can guess and change boards, but that is a costly and risky path.
 
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