car amplifier strange short on main 12V

[disorder]

hello,
i have on issue that i don't understand on a car amplifier
i have a short between positiv 12V and ground but during 3 seconds then the resistance rise , and if i change black and red probes i have short too , same rising.

put on 12V power il have 12V line stable, i consume some amp and then 0amps. the led not shine and no other line is open. mosfets on first stage have 12V on middle pin and ZERO volt on other pins.

can you give me some tricks ?
thx

[petehall347]

Re: car amplifier strange short on main 12V

its capacitors charging up .that is normal

[disorder]

Re: car amplifier strange short on main 12V

ok, now after this test with power supply, the short is gone.
the amp stay with green light
what the hell is that !!!??

[petehall347]

Re: car amplifier strange short on main 12V

post some pictures and tell us make and model and actual fault

[disorder]

Re: car amplifier strange short on main 12V

hello
some news, i don't know why but now the amp start normally, no short, no protection mode
but i have left outpout doesn't work ; i have the sound only if i put the volume really high but the outpout volume is low.
right outpout works normally

i will try to check this line...
i have to do some research on google to find how to test that

[petehall347]

Re: car amplifier strange short on main 12V

swap inputs see what happens