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F61 error codes could either be IC501 or the regulator (IC502) in the power supply section.
Other possibilities are:
1. fan not turning;
2. cold solder;
3. looses connections;
4. one of the other components/systems hooked up to the power supply is causing a fault (tuner, disc player).
Hope this be of additional help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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