|
The solder joints do not have to look cracked to be cracked.
Most cold solder joints are invisible fractures that develop a layer of corrosion inside of the cracks and make intermittent connection until they heat up.
Step one is to go over all of the PCBs and reflow the solder on anything heavy, anything hot and anything that undergoes physical stress. That means big items like transformers and coils, hot stuff like power resistors and big transistors, every connector in the set, all the pots, switches etc.
See what you have after you do that.
|