Is it worth trying to fix a car amp?

Datoyminaytah · 31st July 2004, 11:56 PM

I just spent a buck and a quarter on a car amplifier that turns out to be non-functional. (It was a cheap gamble.

) I opened it up and found two blown transistors (case cracked,) and scorching on a nearby white blocklike component I don't recognize. (High-power resistors?) The positive power terminal assembly was a little melted, but I can fix that.

I can desolder/solder components. Hopefully I find out what the transistors are. I have a multimeter.

I'm not trained in electronics (just know basically how components work) so my worry is that even if I replace a few blown transistors that the problem may be elsewhere, and they'll blow again.

Any general tips on an endeavor like this? Toss it in the can, or replace the transistors and cross my fingers, or test this or that with a multimeter? It's a Lightning Audio B200.2.

Please don't say "Lightning Audio? Toss it!" because I have a limited budget and would only be replacing it with something else I could get cheaply.

tenderland · 1st August 2004, 01:18 AM

Check out the thread " replace xistor or trash can " in this forum
and as per NETLIST check out this thread ,very good

http://www.bcae1.com/

Jeff

cunningham · 5th August 2004, 12:54 AM

First remove the power transistor, all of them. Not the mosfet's or rectifiers as they are the power supply devices. Measure the voltage that drives the outputs, should be a + & - output from the power supply section to verify that it works. Check all of the output transistors and the drivers and replace any burned resistors.

It sounds like someone shorted out the speaker wires and this amp is not fuse protected. I repaired a Fosgate amp once and every output transistor had it's own fuse. I guess that is why they costs more.
anyway...

Good luck

31st July 2004, 11:56 PM	#1
Datoyminaytah diyAudio Member Join Date: Mar 2004 Location: Connecticut, USA	Is it worth trying to fix a car amp? I just spent a buck and a quarter on a car amplifier that turns out to be non-functional. (It was a cheap gamble. ) I opened it up and found two blown transistors (case cracked,) and scorching on a nearby white blocklike component I don't recognize. (High-power resistors?) The positive power terminal assembly was a little melted, but I can fix that. I can desolder/solder components. Hopefully I find out what the transistors are. I have a multimeter. I'm not trained in electronics (just know basically how components work) so my worry is that even if I replace a few blown transistors that the problem may be elsewhere, and they'll blow again. Any general tips on an endeavor like this? Toss it in the can, or replace the transistors and cross my fingers, or test this or that with a multimeter? It's a Lightning Audio B200.2. Please don't say "Lightning Audio? Toss it!" because I have a limited budget and would only be replacing it with something else I could get cheaply.

1st August 2004, 01:18 AM	#2
tenderland diyAudio Member Join Date: Jul 2004 Location: us	fix or replace Check out the thread " replace xistor or trash can " in this forum and as per NETLIST check out this thread ,very good http://www.bcae1.com/ Jeff

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5th August 2004, 12:54 AM	#3
cunningham diyAudio Member Join Date: Jun 2004 Location: Knoxville	First remove the power transistor, all of them. Not the mosfet's or rectifiers as they are the power supply devices. Measure the voltage that drives the outputs, should be a + & - output from the power supply section to verify that it works. Check all of the output transistors and the drivers and replace any burned resistors. It sounds like someone shorted out the speaker wires and this amp is not fuse protected. I repaired a Fosgate amp once and every output transistor had it's own fuse. I guess that is why they costs more. anyway... Good luck