JL Audio 500/5 channels not working. Please Help - diyAudio
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Old 26th July 2012, 11:49 PM   #1
kccapn is offline kccapn  United States
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Default JL Audio 500/5 channels not working. Please Help

After reading some threads on here I went through and replaced all of the TO-220 type components on the main board that contact the heat sink in an attempt to fix my problem,... it didn't fix everything. I have sound from all channels now except for the front left channel. I've switched the inputs all around and the problem stays with the front left channel output of the amp. I tested the amp on the bench using the same test speaker for all channels so I know it's not the speaker either. Where else should I be looking? What other components should I look at replacing?http://cdn2.dastatic.com/forums/imag...s/confused.gif

Any help would be greatly appreciated.
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Old 27th July 2012, 02:43 AM   #2
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Are all of the LEDs lit on all of the driver boards?
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Old 27th July 2012, 03:30 AM   #3
kccapn is offline kccapn  United States
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I haven't checked any internal LED's. The power LED is the only one of the three illuminated on the front. Are there internal LED's to look for?
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Old 27th July 2012, 03:39 AM   #4
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Yes. There are 3 on each of the 4 audio driver boards.
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Old 27th July 2012, 05:20 PM   #5
kccapn is offline kccapn  United States
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I checked the boards and found one that only has one of the three lights lit up. I've included a picture. The lower LED that's by itself is on, but the two side by side at the top are off.
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File Type: jpg IMAG0547.jpg (840.4 KB, 86 views)
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Old 27th July 2012, 05:57 PM   #6
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I think I have the same problem on my 300/4... Did your power supply IRF540 got really hot when on idle? (the one that's not heatsinked next to the toroids and power supply controller... I have my own thread but I'm looking for answers everywhere
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Old 27th July 2012, 07:28 PM   #7
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There is a large resistor next to the LEDs marked 473. Add new solder to both pads, desolder the pads and then re-solder it. Does that help?

All of these resistors on all of the driver boards need to have this done to their terminals. This is the most common failure in these amps.
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Old 27th July 2012, 08:07 PM   #8
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On to that, thanks guys!
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Old 28th July 2012, 03:36 AM   #9
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I have the exact same problem, 2 of the top leds are not lighting up. I re-soldered the 473 resistor and no success..
However, I did notice a difference in the voltage reference to ground on the 2 differential amplifier transistors that you mentioned in my post.. Those read 2G X can't seem to get anything on the internet..
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Old 28th July 2012, 04:24 AM   #10
kccapn is offline kccapn  United States
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I resoldered the 473 resistor as you mentioned on all 4 boards. When I apply power, all three light come on on the other three boards, but still only the one on the other board. After about a second, the two lights come on then go right back off and stay off. I don't know if it was doing this before , but it's something I just noticed that may help in the diagnosis.
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