MS12.2 - emitter upgrade

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mattjk
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MS12.2 - emitter upgrade

Thought it may be useful to anyone who wants to upgrade theirs to 70.2

I wish I had taken more pictures

Bezel, glass and reflector removed, it is glued, but after being run on turbo a few times weakens it. Soldering quality not the worst but not the best.

Desoldered and MCPCB removed, lots of thermal interface paste! There is a brass insert/plug which I believe is attached to the primary heatsink that the fan surrounds.

Emitters desoldered, I found the best way was to use the back of a cast iron pan on the gas hob, as trying to maintain temp on a large MCPCB using hot air was challenging.

Not impressed with the poor adhesion, probably a contributing factor in the high failure rate of the DX80, in my opinion they have used a solder with a low flux content to avoid having to manually clean the board.

While the board was hot, i took the chance to clean off the old solder (I wish I had got a pic but the contact between the thermal pad and board was not great)

The resistors are just 0 ohm bridges for 12V Cree configuration. I am not sure why they didn’t just increase the heatpad like this

http://kaidomain.com/S025183-16mm-x-1_5mm-DTP-Copper-MCPCB-for-CREE-XHP70-12V

New emitters flowed on using good old 63/37 leaded solder, bit of a mess with the flux.. Top tip, clean it off while its cooling with an artists brush and 99% IPA

Tested each one, to my surprise they all worked first time.

Board cleaned, PCB varnish applied to resistors, ready for reinstall.

Reinstalled with MX4 and resoldered

Success!

power911
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call it insufficient pics, but I’d say that’s a balanced amount of quality pics.

very clean transplant. Loved it.

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mattjk
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Thanks buddy

Lumeniac
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Tnx!

mattjk
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Maybe hold fire on this, just had a battery cut out, i think perhaps in turbo it runs a direct drive and cant handle it.

MascaratumB
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Beamshot required Big Smile Evil
Nice work Wink

MRsDNF
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Nice work on the mod. Well done. Beer

 

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AlexGT
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That factory re-flowing sucks big time, nice job on the clean replacement of those leds, what did you use as a hot plate for reflowing?

mattjk
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It’s a no go anyone considering this. I think its direct drive on turbo and when its hot (lower resistance) it trips the battery safety short circuit. Oh well lol

djozz
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You could use slightly lower drain batteries, see if that helps.

Great led swap btw, and amazing that expensive flashlights are delivered with such lousy-soldered leds.

Wieselflinkpro
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djozz wrote:
You could use slightly lower drain batteries, see if that helps.

No, MS12 has a battery pack, its not possible to use other batteries.