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AFT = Automatic Fine Tuning and is engaged when the button is pushed "in". It helps to keep the tuner locked on to the correct frequency.
ACM = AccuMatic. This button is a preset color and tint adjustment. When you press in this button, the controls for color, tint, etc. will have limited or no range. The adjustments for the ACM switch are located on the back of the set. Most manufacturers had such a switch on their sets to alternate between the front panel color controls and a group of factory preset color controls. It was mainly just a gimmick to run the price up.
There are many things that could be causing your problem. Could be the high voltage tripler, a bad capacitor, open resistor in the power supply or deflection circuit. Maybe someone will chime in and agree to help repair your set, which would probably be the best thing since you don't have much experience with TV repair or high voltage. You might get lucky and still be able to find a TV shop that can repair it; but, finding shops who are willing to work on a TV this old are few and far between.
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