Diagnose this Nanjg 105C...[FIXED, thanks!]

I had an XM-L glued to a heatsink and an 8xAMC driver (3.04A Nanjg105C from I.S.) with leads soldered to the emitter. I always double-check this kind of thing before committing to the next step. Hooked up an 18650; it lights up fine and I go through the first couple modes in the stock sequence. I set it down and came back to it with the soldering iron. I hooked it up to the same 18650 to see the shiny bright light before more soldering. Nothing. :frowning:
I went ahead and soldered the bridge. Again, nothing. :~
I looked over the board and see that the 2 pins on the MCU (Tiny13A) don’t have the blob of solder like usual. Fixed that, still nothing :cry: … |(

I have must be missing something common or obvious. I’m waiting on more drivers in the mail but this is the last one I have for now :slight_smile:

So, generous and handsome expert, check out the pics below. Anything?





The pins on the Tiny13 should not be soldered together, as you show in the photos. They should be soldered to the board, but not together. Sorry, misinformation.

That should be ok; it’s the same as connecting a star to ground.

I don’t see anything wrong. The wires don’t look that good, maybe a short?

Yeah, joining those pins on the on the IC is the same as connecting star #3 (low,medium,high).

I remember soldering those 2 pins because I had read about doing that on Intl-Outdoor. and on DarkSucks.
I was grasping at straws at that point

Hard to see, but check if the output pin on the 7135 (black wire) is grounded out on the ring. Or see if the solder on the positive connection on the back flowed over to one of the 7135 pins.

EDIT: Basically, just poke an ohm meter around to see if something is shorted that shouldn’t be.

I’d desolder the LED wires, strip and tin ’em, clean up the pads (no solder whiskers) and resolder them on. See if that fixes it :slight_smile:

Thanks guys. I de- and resoldered the LED leads. It really was stupid simple-the LED+ lead was flaky (visible in the pics). I unshorted the 2 pins and I finally get my 5–100 modes.

Like Cousin Eddie says in NL Vegas Vacation…“Don’t get cheap on me!”

nice! glad you got it sorted :slight_smile: