ENEDED

Thanks for details. I think I will measure or even unsolder C3 and C4 first as first step. I pick them because they seems to be easiest part.

2nd step will depend and will be tougher to check. If it is the big FET gone bad, it will be toughest to fix for me.

Wait until Haikelite proposing any solutions to me.

How often is the problem of new drivers HaikeLite FET TA in new MT09R and MT03?
Are there any corrections from the manufacturer or current purchases is a risk?

Unknown. I would say they are above average for having a problem.

I would say there is a risk.

I considered buying a used MT09R for $100, but decided against it. If it’s not the driver causing an issue it might be the tail cap pins breaking off or a bad connection/short in the tail cap.

If the issues pop up they can be fixed with a new driver from Lexel or some soldering, but I just decided to pass on the light. :weary:

Wondering if anybody has received the 21,000 lm version recently and if there were any problems with the driver?

Also, does anybody know the tint of the CW version, and is there much of a lumen advantage over the NW version?

Thanks!

Interested NW if price is right.

Finally i receive replacement driver from Haikelite yesterday. I took out problematic driver but i haven’t put new driver into light yet because i want to do comparison and repair the problematic driver, possibly with power supplied to them. Visually they are similar and no fault can be found. I also assume the replacement is good driver.

I did unsolder C3 but it didn’t help, still have very dim light leakage.

Without supplying power, I measure the big FET Rdsoff between LED- and ground, new driver is in 6.xMohm while problematic driver is in 4.xMohm range. Not sure is that and issue. Maybe i should supply power and check this Rdsoff again.

Anyone knows what is this big FET below? Wish to read its datasheet to understand more.

Vishay SIR800DP

The SIR800DP has been around a while - Richard at MtnE has been selling them - it's a very good FET, stays cool under high amps. I thought it was pretty much in agreement the SIR404DP was superior, next step up, then is the SIRA20DP which I currently use as one of my two choices. The other is the Infineon BSC009NE2LS5ATMA. I usually use the Infineon now - great specs. I believe others have had problems with the SIRA20DP.

The SIR800DP is not a bad choice for this light.

Thanks both of you for the info. I shall report back soon.
I wonder is SIR882DP new version of SIR800DP.(updates:looks like they are for different range)

I would take my multimeter and measure the resistance on U3 from the big pad to one of the three smaller pads. Compare the 2 drivers. I think you already did this. 4 and 6 million ohms is pretty much infinite resistance, so I don’t think that is a problem.

I think you can do the same thing for U4 measuring the pad on the left and bottom.

I’m kind of guessing on this, though.

Um, it’s 4/6 miliOhms, not MegaOhms.

You sure? He used a capital M instead of a lowercase m. The miliOhms range is like a dead short.

I have a 3v 3 channel TA driver here. I tried to measure across the FET and got 1K ohm. Across ch 2 I get inconsistent readings. Across the single 7135 I got 4.5k 1k ohms. (Had to break our my new Probe Master test leads. DMM is still crap, though. Lol)

Oh you were talking about the resistors, not the RDSon of the FET.

IDK, I’ll leave it to TA or someone who knows these drivers really well. He built it afterall. Lol

It is Mega. I conveniently call it Rdsoff. :blush:

Does your new FET able to fix the issue?

I don’t have suitable FET for it. I have only a replacement driver sent by Haikelite.
Before I install this new driver into the light, I wish to investigate how to repair the problematic driver.
Being busy at work that I can’t troubleshoot it yet.

I troubleshoot it and can’t find any fault on voltage. There is no voltage that can turn on U2 and U4. U1 has proper 5v power. There are difference below.
1.Voltage between LED+ and LED-
Problematic driver has 410mV while replacement driver has 320mV.
2.Resistance between LED- and ground
Problematic driver has 51Mohm while replacement driver has 68Mohm. I think my previous resistance measurement done a few days ago was wrong on decimal point.

Both drivers have similar current consumption, boot up with 6.8mA and then to 7.3mA and then to 56.5uA. This is without LED connected.

The FET is supposed to be the SIR800 posted before, this is what I used in the drivers I hand made and have not heard of any issues with the 100+ that are floating around.

The production drivers though have used fake FET’s in at least a few of them, it was supposed to be corrected but no idea if it ever was.

The fake FET’s are most assuredly a problem and not up to the task of this light for extended use.

Without specialized equipment it can be very hard to test an FET properly. It is generally easier to just swap it out and see if that fixes the problem. This is the first thing I would try personally, for the $1-3 it would save a lot of time in the long run.

The other option is the small FET for the 1st channel could be an issue as well but far less likely since it sees a max ~0.5A.

Ya, I agree the easiest way is to swap the FET. Too bad I don’t have any suitable FET at this moment.

Is this Vishay SiR164ADP suitable? FET