Pictured is the power section of a midi controller mainboard. It's a PreSonus Atom SQ (The motherboard is labeled "BEEP_Main_Board_V3.0").
The sad story is that it was bought 2nd hand and unfortunately worked for a day. The sadder story is that it's probably my fault.
The device works with a USB 3 cable and not external power supply. I connected it to both my desktop and my laptop and it worked just great. I then wanted my daughter to disconnect from 'A' computer and connected the device to an iPAD via a lightning to USB cable designed for MIDI. Problem is (I guess) that the device drew more power then what the iPad can provide, and I needed to use the Apple lightning to USB3 adapter as it has an extra port for external power.
Long story short - the device will power on, but the screen flickers and no lights. Even more so, it will go into software update / recovery mode, with the screen fully functional and recognized by the computer, and finish a firmware update with no issue. I assume, the burnt-looking component is to blame (and me).
- Any way to figure out what is the component value based on the circuitry around it?
- I assume Q10 is the issue and should there be something in C76?
I have some basic understanding in electronics and got some equipment at home, like a multimeter and a very good soldering station, but reverse engineering a circute is above my abilities.
Also, contacted PreSonus and was not treated nicely as the device was bought 2nd hand and they will not support that. And the local distributor refused to fix this (very common in Israel) and said the company said that there are no more spare parts.
More hi-res images here
Detail of Q10