I Need Sum Serious Help!

[jweb1369]

My system has not worked for a month now because i blew an amp, and havent had money to buy a new one.. Just today i went to my friends house to borrow his spare amp and i went to put it in my car when i connected the ground wire where the battery wire was supposed to be and vis versa.. i tried to reconnect the wires to the right spot and it fried the fuses.. i put two new fuses in and it fried those too. a car sterio expert friend told me it would be cheaper to buy a new amp than to fix it.. can someone please help me with this problem. its my friends amp.

[jdrumstik]

looks like your buying two amps.

[sr20de4evr]

Open it up and see if anything is obviously blown or melted. If so it may be easier than you think to fix

[jweb1369]

ok i opened the amp to check for anything wrong or anything burnt out. there was nothing wrong. i went and bought some fuses put one in and before i could put it half way in it blew.. i dont kno whats wrong. =/

[burly]

Whoa, unplug the power before you put in a new fuse or at least disconnect the remote turn on lead. You shouldn't push in a new fuse when the amp's power is hot.

[PaulD]

sounds like you got some wiring issues

[jweb1369]

WOW!!!!!!!!!!!!!! i unplugged it all.. i put in two new fuses. plugged the ground first then the remote then the power. SPARKS FLEWW!!!!!!! yes i now have two more burnt fuses to add to the collection!!

[jweb1369]

is there anyone out there who can help me?

[burly]

Sounds like something in the amplifier is damaged and therefore shorting it out. When BJTs and MOSFETs are driven beyond breakdown voltage a permanent channel can be formed in the transistor there by making it an always active short circuit. If this happens youll basically be dumping all of your Vcc power (in this case 14.4V @ as much current as the amp can draw) to ground. This will definitely blow the fuses. If it is the case that it is the reason I have just stated, there is nothing you can do but buy another amp.

[sr20de4evr]

Originally Posted by burly

Sounds like something in the amplifier is damaged and therefore shorting it out. When BJTs and MOSFETs are driven beyond breakdown voltage a permanent channel can be formed in the transistor there by making it an always active short circuit. If this happens youll basically be dumping all of your Vcc power (in this case 14.4V @ as much current as the amp can draw) to ground. This will definitely blow the fuses. If it is the case that it is the reason I have just stated, there is nothing you can do but buy another amp.

Or replace the fets

[madmarf]

have u traced the cables back to see if you have burnt the insulation and its hitting earth or try running a temporary cable to the amp and seeing if that works....... if not its down to buy a new amp!!!

[jweb1369]

nah its not that... it must be what burly said. deng guess i need a new amp. what are fets?? do they cost much?

[madmarf]

Originally Posted by jweb1369

nah its not that... it must be what burly said. deng guess i need a new amp. what are fets?? do they cost much?

i havent got a clue what u mean mate when u say fets!!!!!

describe them to me

[GSteg]

FET---> Field Effect Transistor.

Some may cost $1 each or some may cost more, depending on what Transistor your amp uses. Replacing is easy, but finding out the real problem is the hard part.


I wouldn't advise you to open up the case and try to fix it yourself if you don't know too much about the amp. You'll risk frying something (car too?) and its just time consuming. Buy another amp or have the manufactor fix it.