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When you open up the tuner enclosure, you should see pin soldering that is discolored, and/or has a dark crack around it. Also, resolder all the ground connections you find in there, too.
When you find any discolored pins, resolder all the connections on the connector. Go slow and be meticulous.
I've found that alot of problems will be solved by doing this. Even OSD problems!
Is the CTC-117 one of the ones that had a thermister under the chassis that would burn open?
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