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American Bass PH2500MD powers on, no protect. Mysterious socket on board


bsneon98

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Hey guys I have had this amp for a while, It was in my friends car for years with no issues, then I purchased his whole setup when he got rid of the car.

I used the amp in my car for several months and then one day It just lost output. Turns on like it wants to play, doesnt protect. No pop or any signs of plugging anything into the speaker outputs.

Since the amp isnt externally fused I cant check that possibility.
I took all the panels off to see if I can get the board out easily and thats not possible due to all the epoxy

(stock picture until I can get a decent one)
PH_2500__1_opt.jpeg

The board looks immaculate still. No signs of any major failures or blown components, I dont want to hack away to get the board out for no reason.
Upon closer looking I see a jumper socket in between the power inputs and speaker inputs (left in picture above)

I have no clue what that could possibly be for, nothing plugs into that from the chassis or side panels. I dont know much about newer technology in these incredibly tiny and powerful amps.

Is it possible that that jumper is just a "reset" socket or something they use for testing?

Any input anyone has would be greatly appreciated!

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You sure your ground is good?

Ground is good. Tested in multiple vehicles.

What do you mean the amp isn't externally fused? We're you running straight power with absolutely no fuses?

Not fused on the chassis of the amp. I was fused after the battery

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