Lightning Audio S4.1000.1D amp keeps failing - diyAudio
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Old 19th October 2012, 09:14 PM   #1
Mote is offline Mote  Estonia
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Default Lightning Audio S4.1000.1D amp keeps failing

I got this amp with blown outputs, replaced them and tested it. Worked fine.

Sold it to a guy and he called me back in a week and told that amp was in protection.

He brought the amp back to me, again some of the outputs were blown. Week later he called me again to say that amp had failed again.
This time the power supply caps blew up and also some of the outputs have failed as well.

I gave him another amp to try while I was fixing the Lightning Audio, that amp did not fail in his car. He is using the amp to power Rockford Fosgate sub with 4 ohm coil, I measured 3,6 ohm across speaker wires but that should not be problem for Lightning Audio as it is rated for 1 ohm.

What could be the cause for this?
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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Old 20th October 2012, 02:26 AM   #2
EBBCO is offline EBBCO  United States
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Man I get these a lot. Check the voltage at the rails first. Make sure you have stable voltage, so you can eliminate that. There's an i.c in the audio output path that is temperamental, it's a jrc3700d I'm having issues with this as well. It causes bias to run wild. Blowing outputs. Hope it helps.
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Old 26th October 2012, 09:17 AM   #3
Mote is offline Mote  Estonia
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I did not find 3700D ic anywhere.

There is one chip with markings filed off on the driver board, installed in a socket. Is that it?

Have you seen caps blowing up like this as well?
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Old 26th October 2012, 07:42 PM   #4
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The 13600 and the 13700 are interchangeable (or so it seems). If this amp uses this IC, it could be either of those.
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