Trying to repair a Polk Audio PSW125 plate amp, been at it on and off for a week, unsuccessful so far.
At first it was just supposed to be a full capacitor change job, ordered from mouser (all voltage, uf, size, height, polarity, non-polar were measured and checked), then i proceeded, didn't have a desoldering tool, so i unfortunately ripped a trace, which i repair with a 30 awg wire, continuity was fine. I then ordered a desoldering tool and the rest were much easier.
All the transistor tested fine, Then i noticed the R77 3kohm smd resistor seemed to have a small hole, took it out to test it, it was fine at 3kohm, but since it's often a failure point said ai, i replaced it with a 2watts 3kohms metal film resistor, when i went to recap the rest of the board, it got ripped out, including the pads.
I tried to find the schematics but it's not available anywhere (BASH 600170 rev:5), then ai suggested to solder it to the j113 transistor first and third leg, found it dodgy but since i'll test it with a light bulb tester using an incandescent 60w bulb, if anything go wrong and it doesn't work, the bulb will stay lit, and i'll immediately turn it off.
But when i tried it, no light on the bulb, no power light on the amp at all, i checked the fuse, fine, i checked the power pong solder to the fuse one has continuity, the other doesn't, so i desoldered and resoldered both and still the same, and that's where i'm at, kind of exhausted.