Said:
Looks like there is short somewhere, would you please unscrew the bezel, take
the optic out, then try to take those two screws out, and see if it will work fine again.
But when the screws are not there, please use the low mode only, not the turbo mode.
If the light is stuck at a bright mode and won’t turn off, it generally indicates one of two problems:
There is an unintended connection somewhere, allowing power to bypass the driver entirely. If this is true, then the light should act like a 1-mode twisty — tightening the tailcap would turn the light on at a very high level, without even pressing the button.
A button wire is broken or shorted or disconnected. If tightening the tailcap causes the light to blink then turn off, but it doesn’t respond to button presses, this is probably the issue.
There was a week long holiday in China. Everyone is just getting back to work.
Most flashlights are easy to take apart. I’m sure someone here can walk you through opening up a D4 if you ask. It is probably somewhere in this thread…
Yeah, not sure who that is, but it seems the account was created just to complain about the guy who runs Emisar.
What Hank said was probably correct, and is likely a useful answer. Sounds like something broke, and it’s one of two types of electrical shorts. It should be relatively easy to fix.
To add to the list of possible reasons a light would fail to respond to clicks and exit turbo mode, my friends D4 did the same thing after I accidentally popped off the R5 and R4 resistors while disassembling for an Anduril flash. We managed to get R5 back on, and we thought we got R4 back on as well, but it only looked like a good connection, actually it was open circuit.
With R4 essentially unpopulated, the light seemed to run fine, except it would not enter any strobe modes, and once you entered turbo, the only way to exit was to disconnect power. Very strange. According to zeroflow, “R4: MOSFET current-limit”. So this would seem to make sense?
Who knows. I fixed the connection properly and it’s back to normal now. Just thought I’d chime in with my experience.
d4buyer. Ok? Cant remember password.
unintended connection somewhere, allowing power to bypass the driver entirely. - how is it easy to fix? I am just an office worker, so i am trying to get answer, as hank is silent for over two months. Just got tired of nokia as a light.
Seems to me it was ToyKeeper that started the tint mixing thing with her Terminator.
I also did it years ago with a ridiculous Quad XHP-50 set up in a Lucky Sun D80. Very neat look, had to keep it reduced using 2 18350’s as with 2 18650’s it’d make the light too hot to hold in mere seconds.
This was one mighty fine little light. Got mine today and I’ve played some with it. Only problem I see is that it ramps very quickly down from high levels since it get hot.
I also read a thread on laser forum where a guy got a 1watt laser into his eye and got permanent damage. This sounds really scary and I got to think of dangers with powerful flashlights like this and kids. Is it safe to let my kiddo use this? She’s 4 and really liked this little light, told here to not touch the button on it and use it at the level I set for now and I’m watching all the time. Am I paranoid?