I've done a lot of searching and can find no information on open / un-pinned headers on TiVo motherboards. I am specifically looking for info on the series 2 tcd240140.
I see the following un-pinned jumpers
J2003, 8 pin, near the Kfir chip. It looks to be either USB or firewire 1394
J48, 2x3, 6 pin connector next to RCA audio input jacks, looks to be for additional inputs or S-video, has S-video size cut out in rear panel, but taped over
J26, 3 pin, near NEC chip
J33, 2 pin, near SST chip,
My specific interest in is the J2003, especially if it is an additional USB 2.0 connector. I thought it would be cool to have a mainboard USB connector to add rear panel mounted RJ45 ethernet port and a front panel mounted USB connector for iPod, Blackberry, flash drive, SD card, etc.
I have not seen any images of this motherboard posted, so I may do that later.