cf-29LTQGWBM swap touchscreen,issues

I picked up a cf-29LTQGWBM with touchscreen not working, so what else is new. I had a good touchscreen from a mk2 cf-29E that was working well on a parts unit. So, let's just swap 'em , right? Still, no worky. Put it on a cf-29H mk 3, it works fine, one of the SBC models. Put it on a cf-29EWPGZKM, it works fine. Went in and reloaded the recovery disc for a mk4 with touchscreen DFQX3894MA series. Re start touchscreen still not working. Go into device manager all looks well, checked driver and say is working properly. I know there is something obvious I'm missing here, any suggestions guys? Have replaced good touchscreens on defective cf-29's and they all worked and even put some on the cf-29 mk4-5 with 256mb onboard ram and got them to work out ok. Maybe there is something defective on the touchpad PCB here, any way I can know for sure? tune in for the next exciting episode of Let's Stump Driller, a comedy of errors.............Driller

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