Broken Sofirn SP36 BLF

After using the light in a crawlspace quite a bit it no longer works. When it first failed it just wouldn’t turn off, then once I removed the batteries and put them back, it won’t turn back on.

When I screw the top on the light, once the batteries make contact the light flashes once real quick. The button flashes green like it always does, and feels like it works correctly but the light won’t turn on.
I’d tried resetting it using the 13 clicks and hold— that didn’t do anything. I’ve cleaned all the contacts, charged the batteries, tried the batteries in a different light.

Sofirn says it sounds like a short in the circuit board but didn’t say what to do about it.
I thought I’d get some opinions before I try to remove the driver (since I see now it isn’t super easy to do).

I can see some corrosion inside the charging port which I’ve tried to clean out as best I can. I suspect Sofirn is right and something on the board is shorted. Maybe some shorted contacts on the charge port would cause this?

Any advice before I attempt to remove it?

Thanks, Paul

It’s not hard to remove the driver. Unscrew the switch button bezel using snap ring pliers or needle nose pliers or a watch case opening tool. Once the bezel is off, you can lift out the switch PCB with a toothpick or plastic pry tool (use plastic or wood, not metal for this). Once that’s out you can press the driver out through the switch hole. It has weak glue holding it isn’t, but it easy to defeat. Be careful not to damage the driver (why I use plastic or wood tools). Once the driver is out, you can inspect it before desoldering the Led wires feom.the mcpcb, and switch wires from the driver.

got it, thanks! Pretty obvious what the problem is :) should be an easy fix. do I need to glue the board when putting it back together? if so with what?

1 Thank

Excellent. Easy fix. No need to glue it back in.

Gotta like it when the fix is as obvious as this!

Hey, sorry I know this is a really old thread but it’s similar to what I’m up to.

I decided to finally led swap my sp36 today and removed the driver which took a good bit of force. I tested after I broke the glue free that everything still worked which it did so I unscrewed the bezel and then remembered I left my soldering iron at work. So I decided to test it again with everything loose and it doesn’t seem to work anymore. I tried using a wire to connect the negative lead to the battery as I held it together and temporarily just reassembling.

Does the reflector have something to do with the function? I don’t see any failed connections or components.

What’s the other end of the wire doing?

Hey sorry I knew I had explained that poorly. I touched the positive directly to the contact and clipped one wire to the negative ring and the other to the negative end of the battery. I also attempted reassembly but that didn’t even light up the switch LED. although plugging in the charging port does make the switch led light up.