PICkit 4 shorting target board VTG power to GND

[Psi]

Has anyone seen a PICkit4 with its VTG pin semi-shorted to GND?  (~0.4V on diode reading both directions between VTG and GND)

My PICkit 4 seems to have been damaged in this way.
It's pulling the target 5V rail down to 1V and putting the targets lab psu into current limit whenever it's connected.

Windows is still detecting it fine (USB working etc). It seems like something to do with target power has blown.

I'm hoping someone has seen this before and knows which part dies in this way. It would save me time figuring it out myself.

Thanks

[Ian.M]

Odds are you've blown one of the level translating buffers U19 to U23 which I believe are powered from VTG.   Sorry I don't have part numbers and there sees to be a lack of freely available PICkit 4 schematics.   It *may* use the same 74LVC1T45 buffers as the PICkit 3.  Either use a thermal camera or frost the target ICSP connector end of the board with freezer spray and see which part defrosts the quickest when you attempt to apply external target power, and *hope* its one of the buffers as that's an easy fix!

However unless you are on a very tight deadline, its probably a better idea to contact Microchip Support and see what they can do for you.  In the past their policy for in-support debuggers and programmers with a confirmed hardware fault has generally been to ship an advance replacement and only bill you if you fail to return the failed unit.

[Psi]

Odds are you've blown one of the level translating buffers U19 to U23 which I believe are powered from VTG.   

Just checked them, they all measure the same, and it's unlikely they're all blown considering I was only using 1 data channel (UPDI for AVR)

[Psi]

Don't suppose anyone has a schematic for it?