I 've been searching high & low for pcb's for China plasma cutters. Success.

AliExpress has pcb's for China plasma cutters and China welders. Do a search on their site for "plasma cutter pcb" or "welder pcb"

All the circuit boards are available for cut 40 models. The cut 50 uses a slightly different bottom board, but middle and top boards look to be the same as cut 40. Site also has cut 60 boards.

3 piece cut 40 pcb set is $180 shipped. But you can buy individual boards.

Found different brands of cut 50 type machines have slightly altered component placement on boards but are essentially the same. Have Colossal Tech cut 50 & Simadre 5000D for the comparison.

This is not an endorsement of the company selling these pcb. I haven't a clue as to companies reputation or how good the products are. The company name is Golden Silk Road Industrial.

 

Thanks cocobolo95. I have a Cut50 and now I know what to do if it quits.
This thread tells about their MOSFETs http://www.electro-tech-online.com/threads/compatable-mosfets-for-a-chinese-plasma-cutter.103029/

 

Unfortunately the 2 mosfet's recommended are obsolete and hard to find. I've found this mosfet will replace the factory one and is available for $3.55 each at Mouser. IRFP460APBF.

For diode array Sanken FMD-4204S will do the job.