Have electronics shop repair carefully check the VGA signal cable on this monitor or resolder the mainboard (all CRT based) tends to develop fractured solder joints with time. Or the bad cable usually.

Hi pentiumspeed.

I tried connecting power cable (from the original monitor integrated PSU) to PC, but VGA input from an another IBM crt monitor. (Therefore different VGA cable) Still got the same error.

As an additional info; this is the screen my PS/1 outputs. Please find the attached files.

Any idea would be much appreciated.

deksar wrote on 2020-08-08, 15:54:

As an additional info; this is the screen my PS/1 outputs. Please find the attached files.

Any idea would be much appreciated.

Hi, i have the same problem with you, for casuality....has you fix this problem, thanks for replay. Bye.

Can be a Faulty VGA RAM Chip?

AlessandroB wrote on 2024-07-05, 12:17:

Can be a Faulty VGA RAM Chip?

If it does it in every game, I’d say video memory. If it only does it in Prince of Persia, I’d say some sort of PS1 incompatibility placed it in a slightly incorrect graphics mode. Funny that it is on the Vizier and not the princess. Looks like every 4th pixel.

douglar wrote on 2024-07-07, 20:58:

AlessandroB wrote on 2024-07-05, 12:17:

Can be a Faulty VGA RAM Chip?

If it does it in every game, I’d say video memory. If it only does it in Prince of Persia, I’d say some sort of PS1 incompatibility placed it in a slightly incorrect graphics mode. Funny that it is on the Vizier and not the princess. Looks like every 4th pixel.

Hi, when the screen are in msdos in black and White its perfect, when load the Windows the pixel of the screen are how the pictures of prince of perdían, where are the video in the motherboard or how fix this problema. Thanks.

ankor78 wrote on 2024-07-16, 17:33:

douglar wrote on 2024-07-07, 20:58:

AlessandroB wrote on 2024-07-05, 12:17:

Can be a Faulty VGA RAM Chip?

If it does it in every game, I’d say video memory. If it only does it in Prince of Persia, I’d say some sort of PS1 incompatibility placed it in a slightly incorrect graphics mode. Funny that it is on the Vizier and not the princess. Looks like every 4th pixel.

Hi, when the screen are in msdos in black and White its perfect, when load the Windows the pixel of the screen are how the pictures of prince of perdían, where are the video in the motherboard or how fix this problema. Thanks.

I'm not an expert on PS/1 computers, but I remember they had some peculiarities. They have 512KB of VGA memory, yes? If so, you could try loading UniVBE which might clear up a software based incompatibility. https://en.wikipedia.org/wiki/UniVBE

But since you see the same behavior with the Windows VGA driver, it seems more likely that it is a difficult to fix hardware issue.

Are you able to disable the on board video and add a VGA card to your system?

I think that the problem with the error 2401 in my Ibm Ps1 2011 are the Memory of the chip Vga.

I don't know what Memory was bad, i think that change all Memory video , the 8 memories, can resolvé this problem.

The chip are Samsung KM41C464J-10, 64Kx4 (32KB) Fast Page RAM (VGA).

In the diagram are u21,u14,u21,u26,u17,u22,u35,u27.

What do you think people???. Thanks.

ankor78 wrote on 2024-07-17, 14:31:

I think that the problem with the error 2401 in my Ibm Ps1 2011 are the Memory of the chip Vga. […]
Show full quote

I think that the problem with the error 2401 in my Ibm Ps1 2011 are the Memory of the chip Vga.

I don't know what Memory was bad, i think that change all Memory video , the 8 memories, can resolvé this problem.

The chip are Samsung KM41C464J-10, 64Kx4 (32KB) Fast Page RAM (VGA).

In the diagram are u21,u14,u21,u26,u17,u22,u35,u27.

What do you think people???. Thanks.

Oh that's right, the IBM PS/1 model 2011 needed a special "ISA Adapter Card Unit" unit to add ISA cards. You probably don't have that, do you? And even if you did, I don't know if you can add a VGA card.

Check for dirt on the DAC before you start ripping off chips as listed below.

http://ps-2.kev009.com/pcpartnerinfo/ctstips/49fe.htm

24xx EGA or VGA or L40SX LCD display
2401 Enhanced Grahpics Adapter Failure
2401 (PS/2) Planar video error -- it can be the display or the video.
First check for a solid connection -- wiggle the plug at the system end
and check for one or more bent pins
Next swap the monitor
If a 2401 error persists after swapping the monitor, then the system board
should be replaced next. However if your monitor serial number starts with
"72" , is below 72-0374000 and you cannot find the number "61" stamped on
the bottom of the display (you may need to remove the display stand), then
a replacement monitor will probably fix this error.
If it's definitely on the planar (ie another monitor fails) check the Inmos
palette DAC (ceramic DIP module with gold colored middle) for shorts between
the pins.

douglar wrote on 2024-07-17, 18:33:

Oh that's right, the IBM PS/1 model 2011 needed a special "ISA Adapter Card Unit" unit to add ISA cards. You probably don't hav […]
Show full quote

ankor78 wrote on 2024-07-17, 14:31:

I think that the problem with the error 2401 in my Ibm Ps1 2011 are the Memory of the chip Vga. […]
Show full quote

I think that the problem with the error 2401 in my Ibm Ps1 2011 are the Memory of the chip Vga.

I don't know what Memory was bad, i think that change all Memory video , the 8 memories, can resolvé this problem.

The chip are Samsung KM41C464J-10, 64Kx4 (32KB) Fast Page RAM (VGA).

In the diagram are u21,u14,u21,u26,u17,u22,u35,u27.

What do you think people???. Thanks.

Oh that's right, the IBM PS/1 model 2011 needed a special "ISA Adapter Card Unit" unit to add ISA cards. You probably don't have that, do you? And even if you did, I don't know if you can add a VGA card.

Check for dirt on the DAC before you start ripping off chips as listed below.

http://ps-2.kev009.com/pcpartnerinfo/ctstips/49fe.htm

24xx EGA or VGA or L40SX LCD display
2401 Enhanced Grahpics Adapter Failure
2401 (PS/2) Planar video error -- it can be the display or the video.
First check for a solid connection -- wiggle the plug at the system end
and check for one or more bent pins
Next swap the monitor
If a 2401 error persists after swapping the monitor, then the system board
should be replaced next. However if your monitor serial number starts with
"72" , is below 72-0374000 and you cannot find the number "61" stamped on
the bottom of the display (you may need to remove the display stand), then
a replacement monitor will probably fix this error.
If it's definitely on the planar (ie another monitor fails) check the Inmos
palette DAC (ceramic DIP module with gold colored middle) for shorts between
the pins.

I found this in eBay, but i don't know if i connect on this isa card for Ps1 a graphics isa 🥺

https://www.ebay.es/itm/156307214730?itmmeta= … ABk9SR9LDy52aZA

I imagine you would need to be able to disable the on board video before any add-in board would work. Is there a jumper for that?

Here is a person who is having similar symptoms:

Paradise PVGA1A ISA card - strange failure with planar memory

I send the pictures of my screen, thanks

I send the pictures of my screen, thanks

ankor78 wrote on 2024-07-23, 19:44:

I send the pictures of my screen, thanks

So it looks like text modes are fine, but all graphics screens are missing some portion of video memory. Is one video memory chip on the motherboard hotter than the rest?