Chosen Solution
I have a Marshall Kilburn I amp that stopped charging the battery. Once it was completely discharged, it stopped working at all. I decided to take a look on the PCB.
The fuse on the main power supply unit was broken, once replaced, it blew up again. On the backside of the pcb I found a second blown up part, that was named LL10 (see picture). The rest of the pcb looks fine, also the capacitors and the surge arrester look like they are in a good condition. I measured them all and found no serious deviations.
Updated: front side
Updated: faulty MOSFET K10A60D or C124
Does anyone know what this part was to replace it or suffered the same problem and could help repairing it?
Hi, L is the designation for an inductor. Unfortunately without a schematic or a parts list from the service manual (I can’t find one) its’ value is unknown. Inductors usually only blow or burn out if there is excess current flow through them so there is another fault on the board which caused this to happen To the left of the inductor in the image you posted, below the R9 resistor there are 3 clean soldered component leads in a row. Check on the other side of the board what component is terminated there. It looks like some sort of IC or transistor lead configuration so check if it is short circuit. The board is a wan nien E88653 psu but searching online for schematics for the board yielded no results, only wan nien E88653s shows up with no info about the actual circuit and it may be different anyway. Hopefully this is a start until someone else responds.
