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  #1  
Old 03-01-2011
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amp help!!!

ok so i have an alpine pdx 1.600 mono block powering an alpine typr r 12 sub. and it worked perfect till the other day when the bass started cutting in and out and now my amp wont turn on. ive chacked all the wiring and fuses and thats not it. what else could it be?
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Old 03-01-2011
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I know you said you checked all the wiring, but just double checking, this happened to me too and it ended up being a loose RCA cable at the back of the HU.
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Old 03-01-2011
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and that caused it to not turn on?
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Old 03-01-2011
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No lol I quit reading after the bass cutting in and out part haha sorry.
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Old 03-01-2011
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Check your remote turn on wire. Check it at the headunit though. If you didn't hook it up properly it could have come loose. Do you have a good ground?
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Old 03-01-2011
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yeah chacked the remote and its fine. just re did my ground the right way soo thats good. im thinking because my ampp was mounted on my box at may have screwed up the remote terminal in my amp? is thhat ppossible?
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Old 03-01-2011
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It's possible.
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Old 03-01-2011
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just took thhe amp apart and everything looks fine. idk what it could be?
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Old 03-01-2011
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the wire for the amp turn on could be toast. it is possible for wires to have a short or beak, and still look 100%
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Old 03-01-2011
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this is gonna sound crazy but get down close to your amp and smell it. See if it smells burnt. If it does then you fried something in the amp, problem is the parts are so small inside it may be hard to see when you open it up.
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Old 03-02-2011
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okay ill replace the wire and see if thats it. my amp smells fine. it has never even got hot. like ive bumped for 45 min strait and it was still cold from the night befor
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Old 03-02-2011
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Sounds like what happens when a power mosfet dies.. could have been from a lack of power to the amp or bad ground. If its not a bad wire, then I would open the amp up and look for a burnt mosfet in the power supply section of the amp. this might explain why the amp was not hot when this happened. but check the other stuff first.
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Old 03-02-2011
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Do you have a power supply in your house/shop? I would take the amp in there and try it out. If not, take a DMM and test your power wire and remote turn on. That will definitely let you know if it is the amp or the wiring.
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Old 03-02-2011
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well the alpine digital amps never get hot. my friend has 2 mounted in the engine compartment of his boat and there fine. but yeah im guna test everything. what do i do it it is the power mosfet? is the amp just toast?
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Old 03-05-2011
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ran a new remote wire.. not the problem. but if i run a wire off the power wire to the remote terminal it turns on. soo its not the power or ground wires. anything else it could be?
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Old 03-05-2011
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wire the amp to another speaker... any speaker.... you could have blown the sub itself... ive done it many times
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  #17  
Old 03-05-2011
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i know it isnt the sub. the amp isnt turning on.
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Old 03-06-2011
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Have you metered the remote wire itself coming from the deck to see if it is indeed getting 12 volts switched?
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  #19  
Old 03-06-2011
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no i havnt. all i did was replace the wire and make sure all the connections were good
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Old 03-06-2011
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Meter it to make sure it actually has power running through it. Since the amp came on by jumping it from the battery or constant wire then its gonna either be an amp issue or your not getting power from the remote. Remote output could be bad from deck (if its an aftermarket deck).
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  #21  
Old 03-07-2011
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yeah its a pioneer deh 2200ub. ill check that out then tooo. thanks
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  #22  
Old 03-07-2011
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do you know for sure the fuse is good? sometimes you cant tell just by lookin at it... i had to learn that the hard way
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  #23  
Old 03-07-2011
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Quote:
what do i do it it is the power mosfet? is the amp just toast?
You will have to take the amp apart, desolder and remove burnt fets, buy a new set, which are rather cheap, then solder them in. or you could send it to someone, but thats usually about $100..

But do some more troubleshooting first. If your thinking its the remote wire and you know you have power on the main cable and a decent ground, just take a small wire and connect it from the Positive amp terminal to the Remote terminal. the amp should kick on if thats the problem. And if not then take the amp out and remove the back cover plate, take a good picture or two of the insides then post them up here and me or someone else will tell you whats wrong and tell you what you need to do to fix it.
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  #24  
Old 03-07-2011
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okay i did hook a wire from the power to the remote and it did turn on. soo ill keep trying

thanks for all ur help. if u have any other ideas on what it could be please post haha
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  #25  
Old 03-07-2011
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Where is your remote wire hooked into? As said above it may not be getting switched 12v. There's different places that will give you that 12v power, but some of them don't switch or just don't work as you need them to. Took me probably 3 hours total to finally find a good wire to tap the remote in to.
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