Re: Voodoo 2 - Memory error with TMU enabled
Posted on 2021-10-24, 23:23
Poke the TMU pins, even if they look good under the microscope.
Re: Voodoo 2 SLI Issue
Posted on 2021-10-20, 18:28
The SLI SYNC signals go to the FBI, so in no way that cable would have caused TMU related faults. Also, the memory itself is most likely fine, check the TMU pins (poke them and see if they move, also check for shorts between pins).
Re: Voodoo 2 SLI Issue
Posted on 2021-10-19, 16:21
The 4 twisted wires are GND, SLI SYNC IN, SLI SYNC OUT, GND. Using a cable without the twist will just connect SYNC OUT to SYNC OUT and SYNC IN to SYNC IN. This really shouldn't cause any damage. Most likely the card was DOA.
Re: Noise on pass-through of a Voodoo2 card
Posted on 2021-09-05, 09:42
Component placement for the bottom side can be found here: Voodoo 2 component map As for the copper layers, I should have them, both scans and in vector format. Need to find the files first. Will probably upload them in a couple of days.
Re: Noise on pass-through of a Voodoo2 card
Posted on 2021-09-04, 23:22
Layout, as in copper layer? Or component placement?
Re: Noise on pass-through of a Voodoo2 card
Posted on 2021-09-04, 15:14
The RAMDAC has nothing to do with the VGA passthrough. You can remove it completely and the passthrough will still work. Involved in the passhtrough circuitry are the VGA connectors, U10 ( QST3384/ PI5C3384C) and FB6,C36,C38 (U10 power filtering). FB6, C36, C38 values can be found here: https://www. …
Re: Whats wrong with this voodoo 2 Bad Ram or bad TMU
Posted on 2021-08-26, 13:43
TMU0 is on the right side of the card. I fixed quite a few V2 cards, and I never found one with faulty RAM. In case of artifacts, almost always the issue was loose pins. Take a sharp tool (a needle would work fine) and gently poke all the TMU pins, see if they move. Do this for both TMUs.
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 20:19
A good provider is farnell, they're from the UK. LMC7211AIM5/NOPB: farnell code 3005545 ZXMN2B14FH: farnell code 1426252
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 19:51
It's just a comparator, it can be used with simple or double power supply as needed. Anyway, on the card it is configured with a simple power supply. You're welcome and I hope you get the card working 😀
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 19:19
Both mouser and digikey offer free shipping for orders above 50-60E. Farnell and RS are distributors located in europe, you can try searching for the parts there.
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 18:54
Possible replacement for SM2300NSA would be ZXMN2B14FH. This is also available at major distributors.
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 18:38
I found the following transistor markings on other cards: A002, A004, A00C. No idea what transistors are those. These might be SM2300NSA.
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 18:24
They are all based on the same reference design, so photos of other cards might help. I googled a bit, but I couldn't find a clear photo of that area.
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 18:09
You can find LMC7211 at mouser, digikey and other major distributors, or on ebay. Just be sure to order the SOT-23 one. As for Q510, I have no clue what that part is, a better photo would help.
Re: Missing components on Leadtek Geforce FX 5900
Posted on 2021-04-26, 17:49
U501 might be an LMC7211, SOT23-5 package. As for the other part, most likely a transistor (I think it says Q51 on the silkscreen), but I can't really tell what's written on it before "004"
Re: Voodoo 2 repair, missing legs on Chuck
Posted on 2021-04-18, 23:49
TMU pin 128 seems to be supply voltage - did you mean 208? Weird typo on my behalf, yes, I meant pin 208. I still find it weird that the only other connection of that net seems to be pin 62 of the RAMDAC - which the datasheet describes as "Not connected – leave floating or tie to ground". Some V2 …
Re: Voodoo 2 repair, missing legs on Chuck
Posted on 2021-04-17, 21:49
You're right, it's not directly the PCI reset signal, but it is a reset line for the TMUs. The TMUs are chained, the data from TMU1 needs to go to the FBI, but it doesn't have a direct connection, it goes through TMU0. If TMU0 is busy with other stuff, it asserts the stall signal. Same goes for the …
Re: Voodoo 2 repair, missing legs on Chuck
Posted on 2021-04-17, 17:29
TMU pin 184 is a stall signal. The naming of TMU0/1 is correct in the diagram. TMU pin 128/FBI pin 197, reset signal, from the PCI bus.
Re: Bare 3Dfx Voodoo 2 board pictures
Posted on 2021-04-12, 07:18
You can figure the direction by looking at the position of the series termination resistors (10-22-47R), they are placed near the source. The best is to check on cards based on the older reference design (like CT6670), as the newer reference design is missing some, IIRC for the TMU output.
Re: Bare 3Dfx Voodoo 2 board pictures
Posted on 2021-04-11, 19:21
The architecture is something like this: FBI: -unidrectional (output) 16 bit DDR data bus, going to both TMUs. Besides the 16 bit data bus there are also some address pins (since the TMUs are connected on the same bus) and CLK. -unidirectional (input) 16 bit DDR data bus, coming from TMU0, similar …
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