On Mar 20, 2022, at 11:30 AM, Tony G1HMO <tonyg1hmo@...> wrote:

?

So, I was out portable today with the X5105, all went well, came back to the car, plugged the radio into the 12v cigar socket (as I have done a thousand times before), this time,though, the in line fuse blew immediately.

I got back home, put the X5105 on the power supply and it shuts down the 3A power supply as soon as it is plugged in.

Taking it apart, it is well out of warranty, I have traced the fault to the middle PCB labeled X5105 base board v2.01, it is dead short across the power supply.

After taking off various likely parts that would draw any kind of current i.e. rf transistors, several electrolytic caps,3 big SMD diodes, i've narrowed it down to one specific part of the pcb.

Below the Lipo battery socket is two seperate circuits, they look very similar, each has a 8 leg SMD device on , the top one of the two, if I feed the PCB with a current limited supply, after several minutes gets really hot, the bottom one does not.

I can not find what the device is, they are labeled 1A JRH, which I cannot seem to find a likely device with that package on the www.

I have circled the device in red above, if anyone can help, i'd be grateful.

Tony G1HMO