failure Huanyang VFD HY01D523B

I don't see a parallel port helping here. Unless you are hoping that a PC swap will fix the problem (And I see no reason to expect it to).

Why not switch ti running the VFD with analogue voltage control?

I am wondering if you have one of the fake HY VFDs?

You could draw a matrix of all the possible VFD settings (including the jumper position and comms wire polarity) and all the hy_vfd settings and just work through them methodically. You can cycle through the hy_vfd settings pretty quickly using the halrun command-line.

Of course, this might just be a long-winded way to prove that it doesn't work.

Thanks andy, I'll take your advice and start this long term check.
One thing comes to mind... wouldn't the wild swapping of the hard drive I did compromise an execution address?
Is it worth trying with a LinuxCNC live CD first ?

Manu663 wrote:

Thanks andy, I'll take your advice and start this long term check.
One thing comes to mind... wouldn't the wild swapping of the hard drive I did compromise an execution address?
Is it worth trying with a LinuxCNC live CD first ?
 

I really don't think so, the hy_vfd component runs in user space. If it runs at all, it should work. Running it from the halrun command line takes most of LinuxCNC out of the picture. 

Great so I'll try the complete check up then.
I'll come back here to expose any progress.