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Attention Electronics Experts: L&M Urban
sms wrote:
On 1/18/2021 6:38 PM, jbeattie wrote: So, I have this L&M Urban that is probably five or six years old and well out of warranty. It has gotten a lot of use and recently died in an odd way -- with sporadic indicator flashes but no light. I tried the usual protocols for getting it out of safety/sleep mode, but still no light. I figured the battery had died, so I got a nice replacement 18650 cell, took the light apart, pulled the battery, carefully removed the solder tabs holding the protection circuit (spot welded), soldered those on to the new battery, plugged the tiny lead plug back into the circuit board -- and the same old problems. Basically I did this: https://www.youtube.com/watch?v=ZJaI...nel=SamuelEgli Note that L&M is not doing repairs during COVID -- just offering discounts on new lights, which is not what I wanted. Anyway, I went to even greater efforts to remove the little 3/4" square PC board/LED bulb from the light (no easy feat) to see if anything came unsoldered. There was nothing obvious. But poking around one of the little chips (maybe 2mm square with what looks like four leads under a magnifying glass) -- I got the light to come on (and about blinded myself). I figured I'd just shorted something and that it did not indicate something that could be fixed with a solder, assuming I could get my iron on that tiny little lead. I have no idea what this little chip does. It is not adjacent to the power or switch, and I don't know how it fits into the circuit. My question is would something like this be repairable or is it just junk. Does making the light come on indicate a problem with a tiny solder, or is it just shorting around this little controller and that there is a problem with the chip. Nothing looks loose, and I'm thinking that one of the tiny chips just died. That light gets super hot. -- Jay Beattie. Give up. Buy the Gaciron V9D-1800. https://gaciron.aliexpress.com/store/2906009. The thing I really like about this light is that the DRL is not a strobe, it's "breathe mode." The extra mounting brackets are pretty inexpensive as well so you can stick one on each bicycle. Exposure lights have had, pulsed for both front and rears for years. They also repair, which I do like. Had my Strada repaired few months back as it has heavy use, as new now. can’t remember how it is but quite old now! Roger Merriman |
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