Romisen mod help...

[at4rxj]

I know, I know... If I need help with this, I don't need to be messing with anything... lol

I did the Romisen RC-G2 starter mod... I removed the stock led/driver, and put in a Q5 and 7880 board. I left the board stock to see how the modes worked and decide if I liked that or not.

Well, it worked great. I bought 2 of the lights, and left one stock to see the difference. It's much brighter than the stock one (if I can find my way to the high power mode), and the modes are kinda neat, but I think more of a pain in the butt. Problem is, now it doesn't work. It comes and goes... kinda intermittent. If I screw the head down tight, it doesn't work at all. If I come off about half a turn, it works. However, now it's not working no matter what I do, but intermittently. I have thermal paste under the LED, and the connections all look good. Any input? A fresh battery does the same thing...

SEE UPDATE BELOW

 

[taschenlampe]

... If I screw the head down tight, it doesn't work at all. If I come off about half a turn, it works ...

Sounds like the reflector is shorting the emitter.

Originally there is a transparent washer placed between LED and reflector
to prevent it from shorting.

I always put a thin layer of epoxy to the backside of the reflector.


tl

 

[clg0159]

I had the exact same problem. I found that my pill just wasn't screwed in tight enough. Take your reflector off, put some sunglasses on and turn the light on. Then use a screwdriver or some other blunt object and apply pressure around the LED. You should find a spot where the pill rocks slightly and the light shuts off. If your pill is screwed in snug and you still have the problem you may have an uneven spot on the bottom of your pill that you can sand down. Hope this helps

 

[at4rxj]

Sounds like the reflector is shorting the emitter.

Originally there is a transparent washer placed between LED and reflector
to prevent it from shorting.

tl

Thank you!!!!!!!
I remembered the little clear washer. I put it back in (doesn't fit perfectly, but fits...) and it seems to work fine. I will try it a couple more times this evening and see if that changes, but it seems to be working. Thanks again!

Now, is it ok to use that little "washer" with this brighter LED?

 

[Gunner12]

Here's a post for changing the board to single mode and here's another one.

Try cutting a washer with paper or thin plastic. A hole puncher should provide a hole of the right size to fit over the XR-E.

 

[at4rxj]

Well, I'm disappointed. However, through tinkering, I did come closer to finding the problem. I wish I would have worn sunglasses though, lol....

I was testing to see if I was getting and power to the led, and the little lead touched both the negative connection on the led and the side of the "pill" that screws in. The light came on. If I take it off, it goes off.

Do I need to re-solder something? Or is the head supposed to make that connection?

Thanks, sorry for all the questions...lol

 

[clg0159]

No, you are o.k. The body is part of the electrical path. You just bypassed the tailswitch that is why it came on.

 

[at4rxj]

I have an update!

I gave up on this for a few days. I had ordered 2 of the lights, 2 replacement led's, and 2 boards.

I could never get the mod to work right. It would sometimes go off and not come on, but the a little later it would work fine. I took the neg lead and put it straight to what was left of the little ring on the outside, and then it didn't work at all...

I gave up on it, and took the led and board out. I put the neg lead on the new board straight to the ring, and cut the bottom of the "pill" about 1/16", or the thickness of the board. I filed it smooth, and made a little notch in it where the neg lead was soldered on. I soldered the leads to the led, and it works perfectly. It's noticeably brighter than the stock light I still have (that now will stay stock... lol).

Thanks for all the input everyone!