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Always look for discolored connections, especially around the sweep circuits and power supply. I cant remember, does this set have a little regulator on a heat sink? If it does, resolder those connections and the heat sink connections. I remember an Emerson chassis that would shut down with this. It's running at reduced voltages and staying on. I think a B+ is going high and shutting it down. Check voltages on the output of the regulator.
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