fingaz said:
hey, what's the prblem? most of us learn by experimenting. . . the guy's got nothing to lose by looking, and trying to fix it.
if all everyone can suggest is to throw it anyway, then where's the harm in it?
and if he gets it working, then he's saved some money and learnt something in the process
I don't understand why everyone has to be so negative :-(
Totally agree. I swear most topics could be shrunk significantly if everyone posted 'useful' information. This is a place of learning and sharing opinions, of course its down to the moderator to moderate, but still, little jokes and snide remarks get people nowhere, except extra 'posts' and damaged credibility.
*gets off high horse*
As for the problem? I really don't have a clue. I'd inspect the mian board for dodgy solder joints as already suggested, then all the cables. In my experience, 9/10 its a mechanical failure..ie, pots, switches and connectors/cables....always check your cables and connectors
. You could also power it up feel any power transistors/mosfet's for excessive heat (a sign of a bust component) although with any mains in there, might be a bit dangerous. Can you see ANY discolouration around components? I've had diodes blow on me before, shorting and then causing a cascade of other shorts...all visible on the PCB as nasty scorch marks. After all that, test the electrolytic caps, signs of leakage etc.. I doubt if any IC's have gone, al least not without some protection components giving up the ghost, and then you probably wouldn't get any output at all.
Thats how I debug things anyway, connectors, switches, pots, semi's, diodes, and caps. Also, staring at it for about 10-15 minutes almost always provides new inspiration as to where the problem lies...or is that just me? If all that fails, try and get hold of an oscilloscope and probe like its going out of fashion.
Someone did bring up the 'just replace it' idea, which, if much repair time /components is require, is always an option, but that would defeat the point of your post, so I guess you're up for the challenge. Good luck sir
Blueteeth