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F61 just equal 'power fault' Generally a fault with either audio power amp ic (IC 501) or power supply ic IC 502.
As both said ICs get very got first remove bottom steel grill and with the power off and capacitors drained (shorted together with a low ohms resistor or leave unit powered down for a few hours) resolder the ICs legs if there are any signs of cracks aka dry solder joints.
Hope that helps.......
Convergence ICs are smoked. Needs dis-assembly, replace ICs, maybe fuses, usually minor adjustment.
The Red Blue and green images do not "converge" or line up. Caused by heat, power line bumps, lightning, collisions with vacuum cleaner, etc. Small amount of damage happens with each occurrence. Eventually semiconductor material at junctions inside STK IC is depleted and will not handle normal current.
First check out that the power supply has knocked down the voltage to the smaller levels that semiconductors work with say 12 to 25 volts. Look carefully at the main semiconductor. Check that it's got a voltage of this size going to it. If it is an IC, one pin should have it! If the power is working it's way to the main parts. Then I would think about replacing that main semiconductor. If it is an IC whip it out anyway.