OK, more info the Chipset on this board is Chips & Technologies P82C212.

scottie4442 wrote on 2025-07-03, 19:58:

I got this motherboard out of a KLH 195, it is not the motherboard listed at The RetroWeb. The only number I can kind of identify is PX-286 Rev R5.0 MFR.

The issue I am having is when I try to power the machine up my post diag card shows all the voltages correct and the rest is working, the only card installed is video card and memory. the code just shows a line on each 7-segment led.

Any help would be appreciated.

Seems like a revision of the KLH 215 system board - https://theretroweb.com/motherboards/s/klh-model-215

Same model / system board combo as yours seen here...maybe compare settings - https://www.youtube.com/watch?v=gVkms3ZRUN4

Can you confirm which of the two XTALS - 24MHz or 32MHz - is selected. The 12MHz CPU is only suitable for the 24MHz XTAL.

RAM also needs to be in the first Bank. So confirming where the first bank is.

All reseatable chips should be reseated, pins cleaned. Especially BIOS, RAM, CPU.

It should show something on the Diag card without video card inserted. Some video cards don't work with 286 and 386sx systems.

Looks like this is the correct card, got to still verify is as the motherboard is in my shop. I tried to power it on yesterday and get just lines in the post card display so some work yet to do.

I have one of these on my bench right now. It is pretty badly battery bombed, so I’m trying to see if I can repair the bad traces.

I do have the box and all the manuals if that is helpful at all.

PC Hoarder Patrol wrote on 2025-07-04, 01:19:

scottie4442 wrote on 2025-07-03, 19:58:

I got this motherboard out of a KLH 195, it is not the motherboard listed at The RetroWeb. The only number I can kind of identify is PX-286 Rev R5.0 MFR.

The issue I am having is when I try to power the machine up my post diag card shows all the voltages correct and the rest is working, the only card installed is video card and memory. the code just shows a line on each 7-segment led.

Any help would be appreciated.

Seems like a revision of the KLH 215 system board - https://theretroweb.com/motherboards/s/klh-model-215

Same model / system board combo as yours seen here...maybe compare settings - https://www.youtube.com/watch?v=gVkms3ZRUN4

The 215 uses the same board as the 195 but it had a 386 conversion card installed:

It looks to me like most of these traces are broken...

EduBat wrote on 2025-07-30, 14:38:

It looks to me like most of these traces are broken...

The attachment Screenshot_2025-07-30_15-36-31.png is no longer available

I tried to trace these and the run underneath several sockets and chips so not sure where they go. I tried to fix them just in this spot but still have issues. I might pull this board and put it in my "work on later" pile, use the case for something else.

Long shot... have you tried hooking up a physical RESET button?

I've run onto boards that didn't RESET properly, but appeared to work because of a reset signal generated by the hard drive.
Without the HD - nothing till you manually reset.

Since I see a couple labled chips that look like they might be ROMs, I'm guessing the socket labled ROM is for something
extra and is supposed to be empty?

scottie4442 wrote on 2025-07-30, 18:28:

EduBat wrote on 2025-07-30, 14:38:

It looks to me like most of these traces are broken...

The attachment Screenshot_2025-07-30_15-36-31.png is no longer available

I tried to trace these and the run underneath several sockets and chips so not sure where they go. I tried to fix them just in this spot but still have issues. I might pull this board and put it in my "work on later" pile, use the case for something else.

Mine is actually in worse shape but I did manage to remove some of those chips. I can post some photos later in case they help at all.

I’m still in the process of figuring out what all is damaged. I plan on trying to rebuild all the bad traces eventually, but this is just a spare time project.