IBM ps/2 P70 Plasma screen voltages

From: Thomas Dekker <t.dekker_at_student.utwente.nl>
Date: Thu Apr 29 07:25:20 2004

> Thomas,
>
> Rats!

> After that, it is all gravy for yours!

> I have to look at scraps of papers and find it. That was 3 years ago. I
still need to find P75 PSU, video board I suspected either one is not
working right making pixels noisy on tops of lit items.
> (usually first 2 lines of every lit pixels.) Silly I was
> disassembled the P75's PSU hence looking for another.
>
> Oh, I think it is not 200V, less than that. I'll have to find a working
P70 (think my friend may still have it.) And you also need to have DC-DC
converter that goes between panel and three DC power supplies. Your panel
should have that small board behind the panel's.
>
> Both P70 and P75 panels interchange after moving the pins around on the
power plug at panel's side.
>
> P70 is 386DX (either 16 or 20MHz), P75 is real 486DX 33 and uses different
PSUs between them.
>
> I'm curious about your project using these plamsa panels?
>
> Cheers,
>
> Wizard


Well, I'm an electronics student at the university of Twente in Holland.
I got the board from a fellow student, who didn't know what to do with it.
The screen runs on 25Mhz, reading 4 bits of pixel data at a time.
Almost half of the connector pins are ground, and the others are default vga
signal pins.
It shouldn't be too hard to get some of the pixels to light, I'd really like
to know if it still works.
I don't think i have the DC-DC converter (if it's not on the picture), but I
can build a new power supply if I know the voltages as they are coming from
the DC-DC converter.
Btw, if you have any pictures i'd love to see them.
Too bad yours isn't working anymore, it's such a cool device :-)

Thomas.
Received on Thu Apr 29 2004 - 07:25:20 BST