Remove Strobe on Cree U5

Flashlight Modding and DIY Parts
1

Hello at all.
My Name is Ralf. In advance sorry for bad english.

I have a problem with 2 Cree-Led’s for Motorcycle.
I surfed and searched around google and the web but cant find the led-driver board thats build in my 2 lamps.
I want to remove the Strobe-Mode.
All over I can read about a “U2 Chip”. But on my board there is no “U2 Chip”. I cant find a similar Layout like my board…
Anybody a solution for me to remove the Strobe-Mode?

(There are no Components on bottom of this board)

Many thanks and best regards!

2

That LED is about to leave the PCB, poor reflow job.
And that is a fake CREE LED.

3

:cry:
ok…
but the light is ok in the dark…

is there any solution to remove the strobe-mode?

The board have 3 modes. High -> Low -> Strobe

4

What does it say on the U1 component?

5

nothing…thats my problem…. :frowning:

6

If we know what is the name of the IC maybe we could find out if the blinking modes can be removed from it’s datasheet, maybe.

7

i know…
I alright thought the same.
But there is nothing on this IC.
And i cant found the HOMSEMI HS10N10 too on web.

I think its a MBI6651 or something like this….

8

That is a MOSFET, it does not matter.

This IC does not have built in modes like some LED drivers, they would have to be generated with a MCU by PWM, that is why some might talk about an U2.

9

ok

What about this?
-> At this cirquit is it a “601”

Flashlight-Cirquit

Or maybe some like this:

FAN5640S7X

10

I have the same set. The MOSFET acts as a switch for the modes. Easy solution is to solder a bridge from the drain(either middle pin or top base near to inductor) & source(pin closest to the D2070 on board) together. This gives you the bright mode all the time.

11

Yeah, I was gonna suggest poking each pin of U1 with a meter while the thing was strobing, and see which pin was also “strobing” in time with it. That’s likely the output-pin that’s driving the FET. Kinda like bridging always-on the pin (6?) of the ATTiny which drives the 7135s in a regular driver board.

12

^

This if you have a tool to measure voltage fluctuations.

If not, try shorting C2. If that doesn't remove the blinkies, try un-shorting C2 and then shorting C3. One of those probably helps measure "Off time". Bypassed by a short will behave like lots of time elapsed between on-off clicks.

A picture from an angle to help reveal the traces (electrical paths under the solder resist coating) might help us help you.

Welcome to BLF and best wishes.

13

Thanks for the replies…i would check the posts tomorrow and test…the only problem is one light is already gameover… :person_facepalming:

14

Hi You all, I bought from aliexpress two u5 cree fog lights, so I’d like to remove strobe feature, but I found this unusual electric circuit

u5 image

No U2 chip on board, so is there anybody who could please help me to find a way to remove strobe feature?

Many thanks in advance,

Regards.

15

hi All

I've solved the problem with a 1K resistor adding parallel at the big cap which keep the memory alive. you can add a higher resistor (say 4K7) so you can keep the original function if you switch within 15 seconds.

I have no clue how to add just one photo sorry.

Luuck

16

hello bro’s,

please give me sugestion, where you add the resistor (draw on my photo)

17

Good day, I have the same problem, i think i am using a Copy version of Cree U5, i saw a different board, hope somebody can help me remove the low and strobe fun!

Please see the my Cree U5 Board:
https://drive.google.com/file/d/1HQgu9vqkJdnYJafAwhUx1wZsvPYyfB2C/view?usp=drivesdk! ction.