fix two fried amps?

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importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 02, 2007 at 11:15 AM / IP Logged

First one is a rockford 401s 1200w punch amp, its the gun metal style. The power touched the ground. I have another one to match so I want to keep this one. No visual burn marks on anything.

This one is out of a MTX thunderform. the status LED comes on and is green but it does not put out anything. I am not sure what happened to it.

these are not is the same vehicle.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 02, 2007 at 11:16 AM / IP Logged

I figured I would post the pics large so you guys might see something I cant.

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 02, 2007 at 1:05 PM / IP Logged

Power touching ground should have blown the fuse at your battery. It should not have hurt the amp. Do you have an ohm meter to do a little troubleshooting?

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 02, 2007 at 1:47 PM / IP Logged

Yeah I have alot of testing stuff just not sure where to start or what I am looking for since there is no visual damage.

Alpine Guy

Platinum - Posts: 2,478

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Joined: October 18, 2003

Location: Canada

Posted: December 02, 2007 at 2:03 PM / IP Logged

With the rockford i looks like it has to amp stages, on on each side, so both amp stages should be identical, take your ohm meter and test the resistance on those mosfets and compare them to the mosfet resistance on the other side, check all 3 resistance combination on each fet, if they are off by quite a bit then you will for sure need to get that amp repaired.

Thats a start, it's going to be hard to repair that amp if you don't have much repair skills, since it uses those micro resistors, I would recommend sending them to a local technologist.

2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 02, 2007 at 2:16 PM / IP Logged

If it were me I would put the amp back in the vehicle and verify you have 12 volts on power and remote. The 2 transistors at the bottom left and bottom right are the power supply transistors. Set you ohm meter to the Diode test function. Touch and hold one lead to the metal tab of one of the transistors and then touch the other lead to one of the outside legs. Then touch to the other outside leg. Do this with all 4 transistors. None of them should read below .300 after leaving the leads there for 10 seconds or so. If any of them read below that let me know what it reads.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 02, 2007 at 6:20 PM / IP Logged

can you show me exactly where? I tested the 330uf caps and they all read 805.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 02, 2007 at 6:23 PM / IP Logged

The RF led doesnt come on.

importhunter

Copper - Posts: 76

Joined: November 30, 2005

Location: United States

Posted: December 02, 2007 at 6:28 PM / IP Logged

also while I am on the diode setting I put the ground on the ground on the amp and the + on the + and I get a reading of 804

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 02, 2007 at 7:21 PM / IP Logged

Notice on the bottom left of your picture, on the Green strip that all of the 3 legged thingys are mounted to. There are 2 designations ON THE GREEN STRIP One is TC7 and the other is TC8 Those are the 2 power supply transistors on that side. On the lower right side of your picture the green strip has 2 other labels one is TC15 and the other is TC16. These are the 2 transistors on the right side.

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