Join Date: Mar 2002
Location: Austin, TX, USA
No way to tell without diagnosing the circuit. However, I'd recommend inspecting the internal solder joints and resoldering anything that looks dull or even cracked. In particular, look for 'large-lead' componenets. Test points, transformer leads, power transistors, etc. that have large leads tend to have cold joints which will crack over time. Also look for fryed resistors, capacitors with bulging bottoms or capacitors that are oozing electrolite. Beyond these visual types of things, it will probably require a DVM, O-scope, and schematic to troubleshoot failed components etc.