Ok, so I have a JBL px300.4 amplifier (125 wattrs x4 rms), and I went to get a car wash the other day and my trunk must have leaked, and my amplifier stopped working, as soon as I realized it I immediately turned everything off. I took my amplifier apart and here is what I found to be the problem:
So I was wondering - rather than buying a new amplifier, couldnt I just simply solder on replacement parts? I'm not sure what those are, but I think they're tiny capacitors...am I right? Where could I find replacment parts?
In case its not clear on the picture, the blue (capacitor?) that is blown up and hanging on by a thread says "(M)P", "85 DEGREESCELIUS", "U5E" (maybe micro 5E), and "16V"
Any help would be appreciated.
Thank you
Check your mosfets too. Usually just a capacitor doesn't cook a system.
Lanman31337 - Cavfire wrote:Check your mosfets too. Usually just a capacitor doesn't cook a system.
what does a mofset look like? Everything else looks physically fine. Like I said water got in and the amp went into protection mode; as you cans see why.
Replace those capacitors and check to see if she turns on still.
Please be careful replacing them though, unless you want one to explode
Stephen wrote:those are capacitors. 22 micro farad (uf) 16v max
heres a link to some, make sure to remember which side is + and - because they are probably polarized
http://www.mouser.com/Search/ProductDetail.aspx?qs=jGMaQLfrX4rl4dDt1wpVCA%3d%3d
After looking at everything after your comment, I dont beleive they are 22 uf. Yes the ones behind it are, but the 2 that blew are smaller in physical size. So I took a closer look - its hard to tell because the plastic coating around it is melted, but I think they are 10uf. Now - im 85% sure thats what it says - but if I'm wrong and replace it with 10uf what could potentially be the adverse effect going lower than the original compared to going higher than the original?
Ok, so I went to the local shop to buy some capacitors. It couldn't find the exact same capacitors, so I bought some that were rated at 16v, and 10 uf, but rather than 85 degrees C they're 105 degree celcius - i didn't think that would make a huge difference. I soldered them in and bolted everything back up. I now have a new problem!
The protecion light doesnt come on anymore, but as soon as I turn on the radio and the amplifier powers up I hear a humming noise coming from the amplifier. I looked at it, and the protection light is off, the power light is on, and the I-E/OPT light is flashing. After about 5-7 seconds the fuses blow (2x30amp) and the humming stops.
I turned everything off, replaced the fuses, turned the car on, without the HU in, and then rechecked the fuses - they were fine. So they blow pretty much when the amp powers up.
Any thoughts?
