how to repair wrecked H1? (preferably 519A)

So I have a wrecked Convoy H1. The flashlight came wrecked and was replaced with a new one, which leaves me with a flashlight host:

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This is supposed to be a LH351D LED and I would like to repair it myself. It is a 75 degree TIR lens.
Can I simply unsolder this LED board and replace it with a 519A LED board bought from Convoy or do I have to replace the driver as well?

I do have soldering equipment (TS100 iron and MHP30 hotplate) but I have never soldered a flashlight before.
Should I replace the whole LED board or the LED alone?
What else would I need?

That’s interesting, wonder what happened there. Do you have a DMM? I wonder what happens if you try the diode tester on the mcpcb.

The LED still works but its purple.
It has probably been dedomed in assembly.

I do have a Fluke. Where should I put the probes?


In that case you can only replace the LED

Thank you :slight_smile:

Do I have to replace the driver as well?
The original LED was a LH351D, I would like to change to 519A.

Driver should be just fine, just an emitter swap. The 519A is the same pad footprint and will fit on that mcpcb…I suppose it will play nice with the optic as well since those emitters are nearly the same dimensions but maybe someone can confirm or add input on that. You could just order the emitter from Simon (or Hank), or if you want it already mounted then ask Simon if he can do that with the same board used in the headlight. I don’t have that model myself but it looks like it’s the squatty board he’s been shifting to recently, so either you get that same one or shave down the standard round ones (which is fine in this case, just added labor). I’d just use the board that’s in your light now and do a quick emitter swap. I have that same mini hotplate and love it, works great and the profiles come really close to good manufacturer reflow recommendations compared to our usual diy methods. You don’t even need to clean up that spatter on the board if you don’t want to.

Take out the mcpcb, remove the old led and give the mcpcb a bath in iso alcohol which should clean it up. Reflow new led and it should be good to go. I like to clean up the flux with iso before putting it back into the light, but that’s just me being ocd.

edit… clean off any old heatsink compound and use new compound.

Agreed that the driver should work fine and you can just reflow the new 519A onto the existing MCPCB.

It helps to have solder paste for reflowing LEDs, but solder and flux also works.

Have fun with your first mod! :beer: