Question about Legacy Audio Blue Diamond LA1880 Car Audio Amplifier

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Legacy amp in protect mode

Hya i have a leagcy la 798 wich a live wire hit the speaker out put then wnt into protect made a chip had blown so i replaced it but still in proctect plz can sum 1 help !!!!!!!!!!

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  • biggy19 Dec 15, 2007

    ummmmm not sure mate i think its caleed a heat shrink chip but not 2 sore

  • biggy19 Dec 15, 2007

    yes will do thanks alot 4 ur help

  • biggy19 Dec 18, 2007

    1. heres the two chips i replaced that were burnt out but still in protect mode

  • biggy19 Dec 18, 2007

    • this is the whole and the red 1 can be used for parts i hope

  • biggy19 Dec 18, 2007

    thanks alot mate realy helpfull ill let u no how it gos



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What was the part number on the transistor you replaced?

Posted on Dec 15, 2007

  • Perry Babin Dec 15, 2007

    Can you post a photo?

  • Perry Babin Dec 18, 2007

    It appears that there were four of the IRFZ44 power supply transistors (or whatever transistor they used in this amp). If that's the case, you need to replace all 4 instead of only two (for better reliability).

    The amp is probably going into protect because one or more of the output transistors has failed. Measure the resistance between legs 2 and 3 of each of the individual output transistors. The outputs are the 4 larger transistors clamped to the heatsink on the other end of the amp. If you find any that read near 0 ohms between legs 2 and 3, it's probably defective and needs to be removed from the board to be checked. Mark their locations before removing them if you remove more than one at a time.

    You should also read through this web page. It will help cover the basics.



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Kenwood kac-6295 shuts off then turns back on at high volumes

Did you wire the speakers in series or parallel? 4 ohm speakers in parallel actually come out to equal 2 ohms wich most amps would see as a short causing protection issues. 4 ohm speakers in series equals 8 ohms which should be fine for your amp. been there : expert-tech / SAM

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I have a Legacy Predator 2000 watt amp with 2 12'' Kicker speakers. It has been in my car for about a year now, and it recently just stopped working. I have the green light to the amp, im not sure about...

If you have checked your ground, live, remote and RCA's, The problem may lie with your kicker speakers.
There may be a loose wire connection on the speaker terminals (hense no sound).
Check the terminals at the speaker (+) and (-) then check the speaker wires to your amp inputs.
Usually if there is a fault with any wires linked to your amp, the amp goes into protect mode.
If your amp is not going into protect mode, try linking a different speaker to each terminal on your amp (left) then (right). If you get sound through a different speaker, more than likey your speaker wire to your kickers has came loose (due to vibrations) or there is a break in your speaker wire.

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I couldn't able to switch on my sony str db930 .when it was use it say me protecter.

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Protection Circuit is bad. It needs to be serviced. If all speaker wires are disconnected and it's still in protection, it's got a problem. Hope this helps

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There are 4 reasons an amplifier tries to protect itself.

Overheating - thermal shutdown.

Over Impedence - The subwoofers installed are not configured into a load the amplifier can handle.

Output is grounded - a positive wire strand may be touching the ground terminal - a wire may be shorted, or a speaker voicecoil is blown.

Intennal problem - Output on amplifier blown, or some other component has failed.

Check your wiring to the amplifier again - if all is good - disconnect the speakers and try to power on. If the amplifier turns on normally - test the speakers for blown coils.

If the amplifier still goes into protect mode - the problem is internal and needs professional repair.

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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.

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Amp shutting off going into protection mode

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