NavarreToday I finally got to tracing the lines from the TMDS connector on the LCD to the board connector. I need to double check everything before I commit to the board layout, but my preliminary findings are below.
As a reminder, this is an 800 MHz, 17" G4 iMac. The descriptions and cable colors are from DremelJunkie's website (http://www.dremeljunkie.com/2011/08/guide-step-by-step-17-imac-g4-tmds-to.html?m=1).
| iMac board connector pin | (LCD) connector pin | LCD Cable Color | Description |
| 1 | 22 | Blue | VCC: 3.3V |
| 2 | 23 | Orange | VCC: 3.3V |
| 3 | 21 | Green | GROUND |
| 4 | 20 | Purple | GROUND |
| 5 | 3 | Red to Red | Rx2+ |
| 6 | 4 | Red to Green | Rx2- |
| 7 | GROUND | GROUND | |
| 8 | 6 | Orange to Red | Rx1+ |
| 9 | 7 | Orange to Green | Rx1- |
| 10 | GROUND | GROUND | |
| 11 | 9 | Blue to Red | Rx0+ |
| 12 | 10 | Blue to Green | Rx0- |
| 13 | GROUND | GROUND | |
| 14 | 12 | Green to Red | RxC+ |
| 15 | 13 | Green to Green | RxC- |
| 16 | GROUND | GROUND | |
| 17 | 15 | Red | VEDID: DC 3.3V |
| 18 | 19 | Grey | GROUND |
| 19 | 17 | White | Clock-EDID |
| 20 | 18 | Black | Data-EDID |
| 21 | 24 | Yellow | VCC: 3.3V |
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