Bad amp - PSW140

Diverge

I've probably owned my psw140 for about 4-5 years (not sure). So i don't think it would be covered under warrenty any longer. Just last week the amp went bad. I changed the fuse, but it burns out instantly. I put in a slightly bigger fuse (2a) and it lasted a little longer before blowing that fuse - and the heatsink/backplate for the amps transistors got pretty warm.

I pulled out the amp pcb, and inspected it visually for bad compents.. nothing is physically blown up, but the bottom the the pcb, under the tip29 and tip30 transistors is slightly browned - but the lands are fine.

is there any schematics for this amp?

also, any idea on what it would cost to get in repaired or replaced vs. trying to troubleshoot it and replace components myself? if it didn't cost too much, i'd have it fixed or replaced. But if there is a common component on the pcb that typically goes bad, i could easily replace it myself.

[Deleted User]

Hello,
It would be best to send the bass amplifier to Polk Audio, 2550 Britannia Blvd., Suite A, San Diego, CA. 92154. Please include a short note giving us your name, address and a daytime telephone number. We'll be happy to examine the amplifier and let you know what we find. There's no charge for that.
Regards, Ken

Diverge

Thanks for the reply Ken. I'll give that a try. Thanks!

Diverge

Well i was a bit curious, and brought the amp to work today. Did some basic troubleshooting and so far found the IRF9540 P-channel FET to be bad. De-soldered it - the drain and source are shorted together (0 ohms).

I think i am just gonna order the replacement parts from digikey and attempt to fix it myself. I can order all of the components (all transistors, diodes, and fets) to redo the whole amp 3 x over for $25.