Gordak 952-v hot air solder station - high failure rate - what cause?

※ Download: Gordak 936a schematic

What is the voltage on the micro Reset pin? So it can presumably be programmed in-circuit. The power supply circuit is also needed.

Not sure why probing the reset pin should change the state of the Reset. Lock bits are there for a reason. Maybe if the problem is explained to Gordak, they would be sympathetic and supply a hex file to reprogram it?

Gordak 952-v hot air solder station - high failure rate - what cause? - This suggests that their failure is common.

The 936 Soldering Station from HobbyKing
Is it worth me reading the missing cap values, and the exact socket labels? Maybe if the problem is explained to Gordak, they would be sympathetic and supply a hex file to reprogram it? But is does not seems like this is the only problem. The 952-V User Manual Chinese and English is here for anyone who has lost it. Since the problem is common - it would be better to identify and fix it, and document the solution for others. I would start looking at the connections to the reset pin and work out why it is 3. After that, we'll have essentially understood the whole thing, and if you want to revive them I guess it wouldn't be too hard to write your own firmware. Not studied exactly how though.