17mm QX5241 5Amp 1-4 LED 2-4s Li-Ion Buck driver, WIP - I'm back in the saddle.

[wight]

@Rufusbduck

I have some of These
They don’t look like the same larger board but I wonder if it has the same buck ic on a different layout and could tell us anything. The second pic in the link shows a large cap that might be 47microf. If you want one to look at or for parts or simply want me to open one up for pics let me know. I don’t like them as they have the 5-mode program I eschew.

It would be interesting to see pics of the larger board. The smaller board is just an FET PWM modes board, you should be able to remove it and still operate the driver as a dumb single mode driver. It seems that 9 times out of 10 (figuratively speaking) the controller will be either QX5241 or QX9920. If there is a sanded SOT23-6 on the board compare it with the pinouts I noted in post #104 in the HX-1175b thread. They are easy to differentiate: one controller uses a middle pin to control the FET (DRV pin) and a corner pin next to that for GND. The other controller uses a corner pin for DRV and the middle pin next to it for GND.