Hornby Class 50: Fixing a Dead Short when DCC fitted

To have custom PCBs made to your own design, check out my channel sponsor, PCBWay: [https://www.pcbway.com/setinvite.aspx?inviteid=571307]

In this video I diagnose a Hornby Class 50 which is causing a dead short across the rails once DCC fitted.
I work out what the factory PCB is doing, simplify and modify it to work properly in DCC, followed by a thorough test run.

00:00 - Initial Look at the loco and test on DC
01:18 - DCC fitting
02:43 - Fault diagnosis
04:14 - Understanding the stock PCB
06:40 - Planning modifications
08:21 - Testing the modified PCB
10:40 - Bug fixing and Final Design
12:19 - Test Running