Double check all the blue 3.9 ohm blue resistors in front of the two STK-392-570 CHIPS. If even one is bad--they can be checked like checking a fuse---the set will not adjust in some way. See other information......
If the set still turns on the protect fuses are good. It is also possible if the resistors are good you may have got a new chip that is bad--this does not happen very often but it can happen. When you see the other information let me know if you have questions.
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SD TECH.
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