Need some repair work on a broken BLF A6

[SIGShooter]

@MyRants

@SIGShooter

Is the led not lighting up? If so are you sure it’s the problem and not the switch? Did you try a different battery? From reading your posts it doesn’t seem as if you’ve really narrowed down the issue with the light. If it was me I would try a different battery and if that doesn’t make a difference then determine if the switch is the problem or not (easily done with scrap wire). Also did you check that the retaining rings are all nice and tight? Edited to say that I forgot to mention that you can also remove the tube from the head and directly apply power to it to see if the led lights up or not.

I tried several different batteries, protected and not, buttoned and flat. I tested each battery in another light.

The retaining ring in the tailcap is solid. I don’t have a tool which will extend the length of the battery tube to reach the forward retaining ring. There is no play at the MCPCB from the forward side of the battery tube.

I did the wire scrap across the negative battery post and the body. No joy, no LED light… I didn’t think of applying power directly to the LED connections. I’ll try that tomorrow. I assume polarity matters.

The red is positive and black negative on the board that the led is mounted on. You can use either a battery or 3.5ish volt power supply to briefly touch the 2 soldered connections. If it lights then the led is good and since you already did the wire test then it’s probably a bad driver or a lose connection in it. Be careful because it’s possible to de-dome the emitter (although you said it already is, which seems odd to me). The de-dome issue was mentioned in the BLF A6 trouble shooting thread here

If you remove the head from the tube you can use a small head phillips screw driver, etc to push against one of the dimples in the retaining ring to see if it’s lose or not.