Need help repairing Ultrafire U4-MCU (Replacing Pill)

Gonna have to go with cuttter than if he wants XMLs in 14mm

http://www.cutter.com.au/products.php?cat=Cree+XM-L

XML on 14mm base

AMC7135*8+MCU 2800mAh 5-Mode Circuit Board

Those are better choices sorry

I am distracted by the Red Sox game if they don't win this game I am going to burn my damn house down.

Do you want to know where to get a cheap lighter from?

Ok, I decided to order the parts you suggested from ShiningBeam for now to fix the broken light. But i'm planning on ordering the XM-L and driver you suggested to upgrade the identical light that I have in the (hopefully) very near future :)

Thank you for the help, i really appreciate it! Can't wait to get the broken light working again!

You can't go wrong with Shiningbeam you will have an e-mail by noon from Bryan saying your parts already shipped and you should have them by Saturday. You pay a little more but the service is unmatched.

Have never ordered from them, but I am excited that i've found a reliable and quick US dealer! Can't wait to get the parts! I see they are in NY, so I should be able to get them quickly and get this light put back together :)

Sorry guys, just thought of 2 last questions. Can I use computer Cpu thermal paste that I have for the led? And also, to switch the led to the xm-l in my working model of this light, do I have to change the driver also?

You don't have to change the driver but it might be brighter if you do it depends if it is direct drive on high try it out and test it with a DMM. Computer thermal paste is perfect, same stuff basically.

Alright my parts shipped yesterday and will hopefully be here tomorrow. I noticed on the damaged driver that there are 3 wires, pos, neg, and what looked like a ground to the pill. Will the new driver have a spot for this ground wire? And will it tell me where to connect it?

Anyone?

Hey Civic,

The ground to the pill is the negative electrical connection to the battery. Your replacement driver won't have that (most don't). Instead, you'll find that a copper trace has been left around the circumference of the board, on the battery-facing side... just bridge this to the pill with a drop of solder, and you'll be laughing.

Good luck!

Thanks :) It took a little modifying to make the new driver work in the old pill, but it works! Only gripe is that the new LED doesn't meet up flush with the hole in the reflector like the old one did, because it's much smaller. And I was unable to re-use the plastic ring that went between the pill and reflector because it used to fit around the old LED and it is too big for the new one, but it doesn't look like the wires from the LED have any chance of touching the reflector. But oh well, my light works again and that's the important part! Thanks for the help!

Glad it worked, man. Plus, now you've got an excuse to slip in a new LED someday when you get bored... :P

You might be able to get away without an isolation disk, but if find you're having electrical shorts, you can often use those hole-reinforcement disks from a stationary store or a nylon/kapton disk from a hardware store.

Take care!

Awesome glad it worked out for you. Make sure you at least put some electrical tape in the shape of the plastic ring on the reflector, if it hits the wires it will cook something for sure. I love it when a broken light works again.

08CivicSi can you put some pic please

Sure, what would like pics of? Beamshots?

Give pics of your modded light with the other C8 and some beamshots of both lights.

I will do this tonight for you, sorry i've been really busy with work! I did measure tailcap current just for the fun of it earlier today and got

Batt - 18650 @ 4.1V

1.39A High

430mA Mid

70mA Low

I was surprised high current is so low, but maybe it's my meter? Oh well light is awesome anyways and does not get very hot so i'm thrilled with it. Will attempt beamshots when it gets dark

I can confirm that the coupon was still working as of Saturday, October, 09,2011.