Help with TK75 standby current....

Flashlight Modding and DIY Parts
1

Hi all!

Please, to those who really know a lot of drivers :wink:

A few weeks ago I started having trouble with my tk75, at home I use very little, but began to drain the batteries alone, the limit being put into operation the protection of batteries…this did not happened before.
I could measure the drain current and this in 2.8mA :open_mouth: (should be in ~50µA) this explains why the batteries are empty, they are 67mA per day,470mA by week 1.88A in the month!

it can be happening? Anybody can help me about this?

Many thanks

2

Hi gaston, do you have a second battery holder?
If you have, you can see if it is a driver or holder problem.

3

Hi zeremefico

Yes, I tried another battery holder and I still have the same consumption between the battery holder and the driver :frowning:

Thanks for your answer

4

Have you contacted Fenix?

5

no, already out of warranty…besides is this modified a long time ago

6

Have you examined the driver to see if any of the components show signs of failure?

It driver is easy to access. Just pry off the contact plate and then unscrew the retaining ring.

7

Hi ImA4Wheelr

Yes I check it, but no found nothing visually damaged….

Thanks

8

Hmm, I'll peak at my driver and see if there are any obvious potential failure points. Chances are, it will be too complicated for me to figure out though.

9

Thanks :slight_smile:

10

Wow, dude. I stared and stared at that damn driver. I got nothing. Way too much going on. I would guess it is the component at U4 if I had to pick the most likely component. I tried to google it but found nothing. I would think it is a buck converter to bring power down for the MCU.

You may want to start thinking of totally modding over your light. I would suggest taking the battery carrier to 4S, replacing one of the emitters with a XHP50, and then putting in a direct drive type driver. I'm hoping to post a thread on an easy way to make one (DD >1S cell driver) that has very low parasitic drain.

EDIT: An easier to implement option would be to contact RMM and see if he can set up one of his TK-Seis-Um drivers for a TK75 for you. Then, you would just need to modify the battery carrier.

11

Thanks ImA4Wheelr

The component that you mention seems to be a transistor may also be a Fet….

I would like to clarify that the flashlight is working properly, but I have the problem that discharge the batteries alone quickly in being on standby…
The flashlight is deeply modified and I am satisfied with their performance, just that I now pass this but before not passing me.

Thanks for the recommendation, I hope a long time ago the driver of Richard but it is not already available recently asked :frowning: