Hi. Hopefully I'm posting in the right category by posting here. I don't really see any troubleshoot/servicing category or something alike, so this seemed the closest.
So, my Manker U23 just died of death the other day, setting the record of not working for 48 hours since I've got it, Yay!.. What happened was I was playing with swapping emitters, shaving domes, etc. when all of a sudden, the flashlight just stopped giving any light, other than the indicator under the switch that was functioning properly.. Who knows, maybe I've shorted something out on the MCPCB when swapping the last emitter before it died.. :| I wouldn't think ESD might've caused it to die, especially after eventually finding out what the damage was.
Basically, the light would only output 2.3V on the emitter's wires and not even changing that value with stepping up or down. I also don't think this happened because of no load being present at the terminals, I don't think a boost driver would burn out without a load (the emitter)
Thanks Makner for the stupid ammount of threadlocker, one broken strap wrench and some good minutes of cooking the thing on the hot plate (until the anodizing got brownish at the base) later, I've got the body unscrewed from the business end and gained access to the otherwise "forever captive" driver. What I've found was the current sensing resistor, a puny SMD 0.03 Ohm I think 100mW ~ 125mW - 1.55mm x 0.85mm, got completely shot, thus I've tried measuring it and of course, it was not displaying any value at all. Who even puts an SMD that small as a current sensing component in a flashlight with a nearly 20W emitter.. (XHP50.2) ?
My problem now is that I don't know where I could find such a resistor without buying a whole reel of 500 or so and hopefully faster than a month..
Also, for the more experienced flashaholics around here, that are playing with drivers on a regular basis, would you assume that swapping only that current sensing resistor might actually fix the driver, or should that resistor popped, it must've took any other number of components along with it.. ? I'm thinking about leaving an open circuit behind it, might've affected something else. Driver being a boost circuit, as the emitter's MCPCB it's configured as 12V.
And here are some pics I took after getting the driver out of it's jail:
The small "R10" marked resistor appears to be blown and measuring it confirms an open circuit. Also no other components are looking like they took any damage, well, looks can be deceiving..
The blob of solder on one end of the small resistor was where the positive terminal was soldered, which I've removed for the sake of clearance around the component in cause (component that since, has been removed from the PCB - and got lost.. )