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Amp do you know of a how to or some sort of direction on how to repair the FET problem with the amp? i can solder and willing to take time

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This is the first place I'd recommend.

Basic Amplifier Repair

Let me know if you have any other questions.

Posted on Jan 06, 2009

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Any sub's I hook my mtx jackhammer jh1200 up to instantly are forced down and eventually fry. Why is my amp doing this?

This problem is caused by one or more of your output devices (FET, Transistor, or IC) is shorted and causing the power rail to be connect through your speaker. Your amp boosts the 12v supply to a much higher +/- voltage rail which powers the amp's outputs. When the amp is shorted or overheated to a point of destruction you can end up with this problem.

It will need to be repaired by a technician.

Mar 03, 2015 | MTX Car Audio & Video

1 Answer

Amp want turn on

Listen everyone who is having any JL 500/1 or 1000/1 amps. There are many reasons why your amps have failed. Most of the problem is the power supply mosfets shorted out and output mosfets shorted too. Those are the 2 biggest problems when you run these amps hard. Also the main power supply capacitors and the gate resistors mostly burn out when a power supply mosfet shorts. Some people if they remove the back cover may see signs of of the problem area and others will not. I have been repairing these paticular amps at least 2 to 3 a week with other amps I get in. It seems that the older ones people bought working are now failing. So this is just a quick overview of what your problem is and is part or is the problem guaranteed. Sometimes I get tired of seeing them coming in but it's what I do and know exactly where to start. I don't know at this time but I think for $160 if you send your JL 500/1 to JL they will just replace the board. Don't quote me on that cause prices change. I would call and ask. My repair depending on the damage is around $80-90 to repair these 500/1. The 1000/1 can be the same or higher. I can't tell you if I don't have it in front of me diagnosing it. As I said though, the problems are basicly the same for the most part and the amp will have to be repaired. I help people also who are electronicaly inclined and if they feel confident and can unsolder and solder and know thier way around a volt ohm digital meter I can walk them through the steps. It's not that hard everybody, really it is'nt. A little confidence and soldering and reading a volt meter and you can repair your own amp. Contact me if you need any help. Thank you!

Jan 13, 2012 | Jl Audio 500/1 Car Audio Amplifier

2 Answers

What does the red and green light mean ???

red and green light? there is most likely a protection and a power light. The red I assume would either be a protection light or a clipping light signal. Does the amp kick off then these lights kick on red then to green?

May 31, 2010 | Planet Audio VX4002 Car Audio Amplifier

2 Answers

When i started to plug my battery in my amp made

you have blown the actual filters that make the sound. a amp is basically a filter with the same filters on both channels on each side of the inside of the amp - channel 1 and channel 2, that pop was in the heat sinks of the amp usually. if you have replaced the fuse in this amp and you get no on light, the internal amp is in need of repair

Oct 24, 2009 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

Trying to find the right FET to replace burnt up ones with

hafler use international rectifier hexfets. there is alot of confusion what constitutes a mosfet amplifier.
if the outputs are mosfets instead of bipolar transistors, it is a mosfet amp.
some designs are using mosfets to drive the switch mode power supply,but use bipolar output transistors.that is not a true mosfet amp.
you need to go to an electronic supplier for the repair industry.
or the manufacturers warranty depot,who will be able to order them.mosfets are very high current devices,you have to ask ...why did they fail. if they are the switch mode drivers,there is bad capacitors in that circuit

May 23, 2009 | MTX Thunder 5-Channel Amplifier 895 Car...

1 Answer

Boss amp turns off sometimes

There must be some bad solder connections in the amp. You will need a soldering iron and some solder. Plus the skill to use them so you do not cause much more damage to the amp. It is very easy to bridge a solder joint to a close by solder joint and cause a short in the circuit and can be very danergous, even cause the amp to catch fire. If you bridge any solder joints and then power the amp on, you may very well destroy the amp beyond being able to repair it by anybody. So if you are not sure of how good you may be able to solder the board, please just take it to a service center and have them check it out for you. If it is just some broken solder connections they should be able to repair it fairly cheap. Most shops charge about $65 for this type of repair, but not all repair shjops are priced the same, so you would need to check it out first.

It is very common, for car audio especially, to get cracked or broken solder joints due to the nature of them. They get bounced around a bit even when installed properly. Every time you hit a bump in the road the amp gets a little jolt.

If your amp had anything else besides the bad connections, it would not play OK after shaking it.

If you need any further help let me know.

Feb 14, 2009 | Boss Klash K780 Car Audio Amplifier

2 Answers


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage is OK, the amp will likely need to be repaired. If that's the case, do you want to repair it yourself? This amp may not be easy to repair. If you are not interested in learning to do this type of work, you should pay to have it repaired. If you want to repair it yourself, I'll try to help you through it.

Nov 11, 2008 | Rockford Fosgate 800.2 Car Audio Amplifier

1 Answer

Blown amp

hi, try connecting the power b+ and gnd and remote turn on cables only (dont connect rca input or any spks), if amp doesnt turn on you will have to take in for repair. no need to buy new amp, coz problem could be a burnt pcb track or even a faulty remote or FET circuit.if amp turns on then connect other cables slowly and monitor the power lite as you do connections. you may have a faulty spk load that will cause amp to stay off or in protection mode. cheers

Jul 22, 2007 | Kenwood KAC-7202 Car Audio Amplifier

2 Answers

My amp is blown!! Dont know what part to replace.

those are likely "chips" or "integrated circuits". can you read any words, letters, numbers off it? if it's a common off-the-shelf chip you can buy from or, AND if you know how to de-solder and solder delicate electronic components using a hot soldering iron WITHOUT destroying them or the adjacent components. if no identifying codes on the chip, maybe google up a schematic of the board (unlikely) and figure out what it is. if it's a proprietary chip made Rockford Fosgate, it will be harder to find. Also, there could be damage to OTHER components that may not be visible, so if you go to all this trouble it might still not work and then you'd have wasted money. hopefully you are under warranty and RF can repair it. otherwise, chunk it in the nearest trash can.

Mar 06, 2007 | Rockford Fosgate P10002 Car Audio...

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