I bought this half stack used for an insanely cheap price (Marshall MG100HDFX) I know, bad reviews, but I couldn't refuse. $125.00 used. It worked great for a few months, and then the head just stopped producing any sound. I am not sure whether this amp is considered a chip amp or solid state, although it has a ton of JRC 4558DD 2004C chips in it (5 to be exact). It has one JRC 5532D 210BB, and one DG212BDJ. It also has an effects board that is surface mounted on a separate PCB. None of the electrolytic caps are leaking, and the ceramic discs appear to be fine. The input jack is clean and all solder spots look great.
The amp cuts on, and the cooling fan immediately runs. I replaced the fuse (just for kicks), and the power module (located on the heat sink of the fan) which are the most common problems. If I run my headphones in the headphone jack, I get a tiny bit of sound, but all other output jacks do absolutely nothing. I am lost at this point. Should I start at the transformer, capacitors, IC's??
The amp cuts on, and the cooling fan immediately runs. I replaced the fuse (just for kicks), and the power module (located on the heat sink of the fan) which are the most common problems. If I run my headphones in the headphone jack, I get a tiny bit of sound, but all other output jacks do absolutely nothing. I am lost at this point. Should I start at the transformer, capacitors, IC's??