What a relief! T2x Mainboard and no BoD (but something else)

[Robbyrobot]

I'm almost happy to report that I bought still another T2x mainboard ("untested" of course) in a T22 base, and that it apparently does not suffer from the common BoD.

Unfortunately, it exhibits another problem, and I'm not really certain how to approach it.

I first attached a known working 700MHz CPU and fan, plus a known wqorking LCD display. Then I booted the board, which worked fine - at least as long as I only wanted to enter the BIOS.

Then I attached an Ultrabay floppy drive and tried to boot from that. Nogo... 02B0 Drive A error. I replaced the floppy with a CDROM drive, but this also did not boot and in fact was not even accessed (LED) during booting.

The Ultrabay connector appears to be defective, since neither an optical drive nor an Ultrabay floppy are recognized. If the base is attached to a port replicator and an external floppy attached to that - and all Ultrabay drives removed, the board will boot from the external floppy. The external floppy is not recognized if an internal floppy is in the Ultrabay.

The base originally included a NIC/modem combo card, but I've removed these. It makes no difference in the behavior.

PC-Doctor shows nothing wrong with the board.

But at least it's not BoD and for that I'm already grateful

A cursory inspection of the mainboard shows nothing amiss, and I'm not sure where to look further. Has anyone else seen anything like this and can suggest what I might try?

As a P.S. I might also ask how to identify the various T2x mainboards, since the boards are often switched from base to base and the serial numbers and model numbers on the plastic base then have nothing to do with the mainboard it contains. Is there a database of mainboard serial numbers somewhere that would permit me to find out whether my mainboard is, for example, from a T20, T21, T22 or T23? Or are there any distinguishing marks that would positively identify the type? With all the mainboards nominally designated "T2x" floating around, it would be nice to know what one really has.

[tom_k]

Hi robbyrobot

Could be the ultrabay switch
I´d also check the u-bay connector once again, specially inside for something that can cause a short.

I dont know how much different motherboards ibm has produced for the T20-T22,
but one difference ist the "+" behind the s3 Logo on the gpu,
only these boards can handle internal sxga+ resolution.
As far as i know you find them in all T22 models and the "last" T21 with 850MHz

hth, much success !

[Timoti]

Guess that's why they invented the FRU numbers. My T22 board is 26P8096. It's on the sticker under the miniPCI card.
Then again, maybe the final T21 series tom_k mentioned come with these boards. The difference on the S3 chip is distinctive for sure.

Anyways, nice symptoms. I assume you already checked out the soldering of the ultrabay connector and if some pins are shorting out or bent in the connector.

[Robbyrobot]

Anyways, nice symptoms.

Yes, I thought so too

I assume you already checked out the soldering of the ultrabay connector and if some pins are shorting out or bent in the connector.

Got sidetracked by a T40 I bought, where I had to replace a hinge that was broken in shipping, but I'll get back to it. Incidentally, you have to remove no less than 13 screws to remove a T40 display hinge - amazing but true

[ergosteur]

in reply to finding out whether you got a T21 or T22 motherboard.

I've found that running the Directx diag tool (dxdiag.exe) will bring up a page with hardware info like System Manufacturer and Model.

I bought a T2x motherboard+base from ebay, and dxdiag identifies it as a "IBM 26473EU", ie 2647-3EU, which means a T22 (search on lenovo website).

[RealBlackStuff]

Timoti hit the nail on the head. Board-model numbers are on that white plastic flap that sits around the miniPCI-card.
The HMM page 150 will tell you for which models T20/21/22 that board can be used.
Page 155 is for the T23.

[phool@round]

Here's a link to the HMM that RealBlackStuff refered to. (Just in case you don't have it.) Here. This one shows the info starting on page 156, probably different date????

[RealBlackStuff]

My HMM has the same pdf number, and is dated inside: April 2002