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Your set is an early 90s chassis.Probably around 1989or 90.It probably has some bad solder joints.Magnavox sets are known for bad connections on the horizontal drive transformer and check where any high power resistors solder the circuit board.Usually the solder there will be cooked and turned a dull gray.Also that particular chassis has a mylar capacitor with a resistor in series with it across the 130V b+ rectifier off the switching transformer.It is located right between the resistor and the standup rectifier. The capacitor short and burns the resistor.This causes shutdown problems.The capacitor gets cooked from the heat.I always mount the replacement under the board.Also the B+ should be very near 130v.It's pretty critical that it be within a volt or so of that voltage. There is a special 8 pin opto isolator IC that goes bad on that chassis sometimes too.Either causes high B+ and shutdown or low B+.
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