RAMDAC's do take input from the EDO RAM. If bad RAM is common that could certainly affect it.

In your last image .. the PCI and register settings to the FBI test OK so I would leave that, and mainly look at the EDO RAM.

Hi,

Thanks for your help, Any idea which one(s) to try first? in the thread I posted above, deeper into it they talk about limiting ram to 2mb using a variable in autoexec.bat. to narrow down which 2mb chunk of ram might be the problem. I will try that to see if it allows witchery to get past the ramdac error. Even if it does I am not sure which 4 chips to remove as different cards have their memory chip chunks set up differently... Also in that last image of mine it talks about unable to detect rs2 line? Any idea what that refers to? I've included a shot of mojo output and some more images of my card.

RS2 is a register select pin (RS0-2) for internal settings. But it's possible the RAMDAC isn't ready or intialising properly.

RS0, RS1, RS2, WR, RD, CLK0... CLK0 (video clock output) is determined by internal PPL register setup. If there's no default values and it's not setup, clock output would be wrong.

In the last image, there's a TMU count error for Board 0. TMU Revision looks wrong and PowerOn Sense is "0xdead".

Maybe TMU's didn't finish setting up, so the RAMDAC wasn't initialised either.

So RAM closest to TMU's..... or TMU's...?

so I should also be looking at TMU ram and TMUs? there is a tool somewhere that checks tmu ram. I need to google for that again. should ai try and reflow the tmu chips? I think I will proceed with fb ram first.

If EDO RAM is the most common fault, and there's no visible damage to the TMU's I would do the RAM first.

FBI RAM also reports as 0MB.

Swapped out entire bank of fb ram on the top of the board with new ram, reflowed solder on TMUs. Still same errors in mojo/witchery. Gonna take one back of board fb ram chip off at a time to see if I can get past this ramdac error... I understand this can also be the clock buffer chip. Witchery does mention it can be this chip u65 on my board, it is a 14 leg 74ACT125... ordered a few from digikey.

I took off one fb ram chip at a time from the back of the board, none fixed the issue. Also, did some thinking. When SLI board is attached, Witchery reports it's ramdac working and finds only one fb ram chip bad. There is no 74ACT125 chip or xtal on the SLI board, for ramdac chip to function there both should be good on the main board, right? If so I think I am down to a bad FBI chip or a broken trace between ramdac and FBI???

IMO if the SLI board is supposed to be attached from the factory, the BIOS may stop before initialising the majority of the board. No RAMDAC setup, no TMU count, no FBI memory count...

Only read the Witchery results when the SLI board is attached....

If FBI pins are reflowed.. and RAM is all replaced, hard to think of anything else except replace the FBI not responding in Witchery

The daughterboard with secondary chipset can be removed and the rest wil work just fine as single Voodoo2 (with pci-pci bridge and TV-OUT). So if the suspected defect is on the primary board, then I suggest to debug the issues with second board disconnected.