[MrBungle]

This is a Thandar TG102 from what I can see. I've got one - very nice when they work. Complete pains when they don't.

Firstly Google "Thandar TG102 service manual" if you haven't already. Check schematic on the last page - the PSU is at the bottom. Check the following things in order:

* Check all electrolytics for short circuit.
* Check all transistors for shorts and open circuits (standard diode test)
* Check all resistors aren't open.
* Check the two reference zeners on the front end for shorts.

If you dare, power it up and stick your fingers on the BD135/BD136 that are the pass regulators for the rails. That should indicate which rail is being pulled hard because it will be hotter than the other one. Follow this around and check everything that touches it carefully.

Usually when diagnosing this stuff, manufacturers like to stick 0.1 ohm resistors in the lines of each circuit block so you can measure current via voltage drop and isolate this to a particular circuit block but Thandar never bothered annoyingly.

I reckon it's a blown up electrolytic or transistor somewhere. Possibly on the output amp as that's the most fragile thing closest to the end user.