A correction to a previous post (that I have now amended).
Whilst I was correct in stating that the USB-C socket is operated in a dumb mode, with no PD modem for voltage negotiation, the two resistors I initially thought to be 5.1K passive 5V mode programming components were in fact just 10 Ohm data line resistors. The camera does not have 5.1K resistors on the smart charger mode programming line.
I note from the UTi260B user manual that it states a 5V 1A or 5V 2A charger should be used. It does not, however, prohibit the use of multi voltage smart chargers. I have not found a reason for the over voltage event that damaged the UTi260B that I just repaired. I can only assume that the charger was at fault but wonder if the issue would have occurred if the usual 5.1K passive mode programming resistors had been present on the cameras USB-C socket. I have installed a 5V TVS diode across the charger input of the repaired UTi260B as an additional protective measure against voltage excursions damaging the TPS630250 DC-DC converter and TP5000 charger IC. The owner will be using a dedicated 5V USB charger to avoid future issues.
The camera was repaired and carefully tested. For those facing a similar failure I can advise that the challenge was in sourcing the required parts in the UK. I had to order a TP5000 charger module PCB from China, to harvest the TP5000 from it, and ordered the TPS630250 adjustable DC-DC converter (set to 3.3V) from Digikey. These parts were not available to buy in the UK.
The UTi260B operating time from a full charge impressed me. It has managed 10 hours of continuous operation during testing
The specification states “greater than 6 hours”.
Fraser