car amp stop working.

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marcomuzik

Member - Posts: 3

Joined: October 22, 2005

Posted: April 09, 2008 at 10:11 AM / IP Logged

I have a Chvy tahoe with two amps installed. one for my interior speakers alpine MRP-F250 4/3/2 Channel Power Amplifier. And a rockford fosgate installed for the subs. I've had both installed in my truck for a year with no problems. One day i turned my truck off but left the radio on and my interior speakers shut off. I looked at the amp and both fuses on the alpine amp were blown. I put some more in and the sparked and blew as i was putting them in. I disconnected the power and ground then installed the fuses and everytime i touch the power or ground with the fuses in i get a spark. What can be the problem? someone told me that it may be the transistors.

haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 09, 2008 at 10:32 AM / IP Logged

It's a fried amp. Repair or replace time!

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Alpine Guy

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Joined: October 18, 2003

Location: Canada

Posted: April 09, 2008 at 11:06 AM / IP Logged

Yup, your amp is shorted, time for a repair if it's worth it to you, most likely not since it's guaranteed to be at least a $100 repair bill, $90 labour, $10 parts. It would be better off to sell it "as is, needs repair" on e-bay and get a new one.

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.

marcomuzik

Member - Posts: 3

Joined: October 22, 2005

Posted: April 09, 2008 at 2:21 PM / IP Logged

Thanks for the responses. I know someone who may be able to fix the transistors for cheap. i was wondering if anyone has fixed this problem before?

haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 09, 2008 at 3:05 PM / IP Logged

No telling. What happened? Without diggin in, and "hands-on'ing" there is no way any of us could tell you whether we've fixed such an issue.

It could be power supply transistors, output transistors, buffer transistors, input op-amps, protection circuit gone haywire, burned circuit board traces... Who knows?

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

i am an idiot

Platinum - Posts: 13,672

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Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 09, 2008 at 8:04 PM / IP Logged

If you can do these 2 simple steps, I can possibly help you out. I need you to turn your radio off and put 2 10 amp fuses back into the amp. and then pull them right back out and check them again. Are they blown? If they are not blown, you have either a shorted output transistor or a shorted rectifier diode. If this is the case this will be an easy repair for you or your buddy to perform. If the fuse blows without having your radio turned on, you have either shorted power supply transistors or a shorted reverse polarity protection diode. If it is the diode this is a simple repair.

The above is assuming that your remote turn on wire is connected to the amp turn on wire of your radio. I need you to put the fuses in without any voltage on the remote terminal of the amp.

KarTuneMan

Platinum - Posts: 7,056

Joined: December 14, 2004

Location: Isle Of Man

Posted: April 10, 2008 at 12:46 AM / IP Logged

haemphyst wrote:

No telling. What happened? Without diggin in, and "hands-on'ing" there is no way any of us could tell you whether we've fixed such an issue.

It could be power supply transistors, output transistors, buffer transistors, input op-amps, protection circuit gone haywire, burned circuit board traces... Who knows?

The Spiz has spoken. car amp stop working. - Last Post -- posted image.

marcomuzik

Member - Posts: 3

Joined: October 22, 2005

Posted: April 10, 2008 at 2:34 PM / IP Logged

Thanks for the responses. The guy told me that some of the transistors had shorted out and gave me the number on it but i don't know where to buy new ones?

haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 10, 2008 at 2:35 PM / IP Logged

Punch the numbers in any search engine, and you'll end up with a dozen sources...

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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car amp stop working.

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