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Triden312 9th February 2012 04:19 AM

JL Audio 1000/1 no mono outout
I have a JL Audio 1000/1 that has evidence of some moisture damage. (corrosion on the bottom of break out board above the speaker wire terminals) When the RCA inputs are connected there is no output but a screeching noise (Power light is on.) But when you connect the head unit to the Preamp Output section and set the switch to fullrange it has an output but has a motorboat sound. I am assuming that this is a filter problem since the outputs work. Any suggestions?

Perry Babin 9th February 2012 05:04 AM

Do you see any green corrosion around any of the feed throughs in the area where you see water damage? You'll need a powerful lighted magnifying glass.

Triden312 9th February 2012 12:30 PM

I will look tonight and post my findings. Thank you Perry.

Perry Babin 9th February 2012 06:03 PM

2 Attachment(s)
The green in the via and damaged traces like the examples are what you're looking for. These are extremely small so you'll have to look carefully.

Triden312 10th February 2012 01:16 AM

2 Attachment(s)
Yes there is green corrosion on the feed through's above the Output terminal on the U1 board.

Triden312 10th February 2012 01:21 AM

2 Attachment(s)
A little better view of the corroded area.

Perry Babin 10th February 2012 02:10 AM

If that via isn't open, it will open soon. You need to make a reliable connection from one side of the board to the other. The easiest is to simply use a jumper wire around the back edge of the board. A better way is to drill the via with a #80 drill bit and insert a jumper wire, soldering it to bare copper on each side of the board. If you're going to use a #80 drill bit, buy extras and expect to break several before you realize how fragile they are.

Triden312 10th February 2012 04:56 AM

There are a few via's in this area. Am wondering what the IC's on top are for and if there is possibly a shorted one due to the moisture. The board seems to have a good coat of con formal coating on it. The transistors check ok, resistors are within tolerance, in this part.

Perry Babin 11th February 2012 08:13 AM

I think those are for the input circuit for the amp.

Triden312 17th March 2012 10:41 PM

Sorry It took me so long to reply with a big thank you. You are the man Perry, it worked fine after I drilled and jumpered about 25 Via’s.. Was a lot of green corrosion coming out of them and I got a mini Microscope with a light then I could see the opened traces that had corroded on the via's.

Thank you Perry

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