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Question about Legacy LA498 Car Audio Amplifier

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Amp not working

Hi my legacy 798 is on protect and will not come off when i turn it off it went on when the out put cable hit a live wire plz can some one help me in fixing it as it was a gift of a old freand wich has not long past away thanks

Posted by Anonymous on

  • Anonymous Jan 22, 2008

    ta 4 thats mate i have a meater and no clue how to use it and its the lil chips that seen to be getting hot i have replaced all 4 of the lil chips and ther still geting hot so wats my next move regards ian

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Anonymous

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Well it sound like you most likely damaged the audio output transistors. take a multimeter & test the outputs. remember they work in pairs so if you find 1 replace the one next to it also. in the amp you will find many transistors, the o/p transistors are the bigger ones.the transistors will be stamped with a part number, typically add "2S" in front if you try to find the parts yourself. good luck.

Posted on Dec 19, 2006

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I have 2 kicker cvr12s and a legacy predator 2400 watt amp and when I turn the radio up the amp goes into protection once they hit a decent time. I just down graded from 15s so I know its not a power...

you prolly have the subs wired to a too low of an ohm load...thats what happend to me. i had the same subs, and a 500.1 watt amp...and they still blew up..whire EACH sub to a 4 ohm...that should work.
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Does it go into protect in the vehicle if you disconnect the speaker wires from the speaker terminals of the amp?


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Disconnect all speaker wires from the amplifier's speaker terminals and disconnect the RCA cables from the amp. If the amp still goes into protect, it probably has shorted output transistors.
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It sounds like the output transistors have shorted. This is VERY common. If you want to try to troubleshoot the problem, I'd need to see photos of the inside of the amp. You'll need a multimeter to check the transistors.

Before opening the amp, remove it from the power source.

Since the resolution is severely limited here, send the photos to me directly ([email protected]). If you're going to send multiple photos, please zip them and send one file.
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Legacy amp in protect mode

What was the part number on the transistor you replaced?
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Amp in protection mode

Disconnect all speaker wires and signal cables from the amp. If it powers up normally (doesn't go into protection), the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.
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Disconnect the speaker wires from the amplifier and see if it still goes into protection mode. If it still goes into protect with the speakers disconnected, there's a problem with the amp; if not, you may have a blown speaker or a shorted speaker wire.
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Amp shutting off going into protection mode

Check this out: http://www.techlore.com/article/14696/
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