Unsolder the current, solder the new/replacement one. This is easy. If you have some parts lying around, that is. I do, but guess I may be too far away. O:)
The solder joint near the resistors is risky for me. I’m going to skip this mod, use this H1-A as is for now, and then get a MTN BST driver when they’re in stock.
Doh!!!
Going from 92% to 89% efficiency would be a third more heat off the driver btw
i’m having strange issue with a buck driver, currently it’s having 3x 0.24 ohm current sense resistors which means output should be 2.5Amps right ? but it outputs more than 2.5A when i try to run 3x osrsm white flat + 1x Xml leds in series.
i’m powering the driver via motorcycle charging system ( driver is designed for it since it’s from motorcycle auxiliary light) , input and output current hovers around 1.3/1.5 amps when motorcycle is idle @ 13.2-13.8v, but as soon as i increase RPM, voltage goes upto 14.2v , and led driver outputs more than 2.5Amps and goes upto 3.2Amps to leds. i get that when input voltage is not sufficient the driver won’t output enough current to the leds, but when the input voltage is enough , it shouldn’t deliver more current than it’s supposed to, right ?
now here comes the strange part, when i remove 1 xml led from above arrangement and run only 3 white flat leds in series, everything behaves normally, output current never goes above 2.51Amps.
any idea why running 4 leds in series instead of 3 , increases driver output current ? btw driver is designed to be used in 9-36v range.
thanks .
A little update, i tried running 4 leds in 2s2p arrangement, and driver output doesn’t go above 2.52Amps. so it works normally. but efficiency goes down. compared to 3 leds in series.
1. when driver is running 3x leds in series - input voltage*input current = 14.2v*2amp. =28.4w. ( output is 24w, so 84% efficiency )
2. when driver is running 4leds in 2s2p - input voltage*input current = 14.2v*2amp. =28.4w. ( output is 16w, so 56% efficiency )
i really want to run 4 leds, but not if efficiency is really that bad. with 4 leds i can use 4x 20mm tir optics, which will give more throw compared to 3 optics. 
slopegatri70, such driver does not seem to be able to handle 4 emitters in series with so low input voltage. For example, 4 white flat emitters in series require ≈12.5V at 2.5A, plus any cable and connections overhead. The effective input voltage into the driver is just very little above that, if at all, and so it cannot work properly.
If you are adamant in driving 4S emitters with such driver, raising the input voltage may work. For that, get some DC/DC boost converter you can fed with the driver's input and then attach the boost converter's output into the driver's input. Suffice to say, adjust the boost converter's output voltage to a sufficiently high value, 14+V.
Actually the input voltage i checked was on driver itself ( 14.2v), charging system gives 14.4v so almost 0.2v drop. i can’t use any dc/dc boost converter because it will stll lower the efficiency. ( motorcycle generates 11.5amps of current, only 4-4.5 amps is left for auxiliary lights after i subtract power requirements of headlight/turn signals/pump/etc.
i really thought 14.2-12.5=1.7v would be enough for this driver. i guess it’s not enough. maybe i should use 3 leds in series with 2x 20mm + 1x 26mm optics. it will have same or maybe a little bit more throw than 4s leds.
or maybe i should change the driver, but i don’t know if there’s any high quality efficient drivers available with low voltage drop.
man this experiment( modding the lights to reduce glare) is costing me alot, and there’s very little progress so far. (
I got also just from one German Guy 2 dead of those with 2R2
both with burned all in one switching chip
and it seems no one checks driver for not properly soldered parts, it is possible to let that do in a good PCB fab automatically
Did you mean…
I just got two of those drivers with 2R2 dead from a german guy, both with TPS61088 boost chip burned.
?
Without overclocking? Seriously?
@Nightsword: are rest of parts same or they have changed resistors too?
I don’t understand why smaller inductor causes eff drop. It can have lower DCR and higher Isat, take a look at specs from cheap inductors from ali:
I mean with inductor of same size and this one looks like it…
Same inductor size/series usually means there's an exchange between inductance and current handling among the different series parts, being all parts of the series usually equally priced. But it clearly isn't the same size/series, they downgraded the inductor, no need to be a hawk-eye to notice imho. They stepped down to a smaller inductor with the same current rating but less inductance. They saved on production costs, and made a worse driver. 
Series is different for sure, but they are pixel-perfect same size. This might looks like different current/sat specs or simply this driver has lower efficiency with smaller inductor. Bourns has good inductors (https://www.bourns.com/docs/Product-Datasheets/SRP1038A.pdf), I may give a try after ordering driver from KD.
BTW, is KD available? I’ve written some emails but no answer since week…
The 2R2 is a little bit bigger as far as I can tell. I have one of 'em right here. According to my cheap 1/10mm accuracy Aneng caliper its measurements are ≈10.25 × 10.25 × 3.7mm.
It's a bad choice what CDM has done. I may still go for it, but it is less appealing. And remember it lacks reverse polarity protection, so always stick it right. ;-)
Try sending some PM to Kaidomain's boss BanL. Or posting something here: KD (kaidomain): Deals and new products thread
They added a lot of vias. Strange that they would rework an existing design unless they were trying to address a problem.
Are these courses useful for understanding what are you talking about? Of course I’m not paying, money is reserved for more flashlights, LOL.
That is Convoy XHP50 driver Eneen, good of course. Related technical information here: Damian's Testing boost drivers (#3+).
Nailed the best offers for the ∅22mm Manta Ray drivers here and there, btw.
Wow this convoy one is super efficient. It will surely go into my next build despite it’s lacking hi 65% mode. Thx!
There’s a new Convoy 22mm driver, XHP35 at 2.3 amps. Same controller as Loneoceans GXB172 so it should be easily configureable for 6 amp 6V, or just get a 12v mcpcb and resistor mod it.
https://www.aliexpress.com/item/4000046041955.html?spm=2114.12010612.8148356.9.27654e0dKFiR1y