Hi David,
Finally got the shield working, it looks like the mega 2560 did not have the well addressed pins A0, A1, D2-D9 or they came out defective. The devil did a great job here.
changed the mcufriend_special.h file to work with USE_MEGA_8BIT_PROTOSHIELD and changed the fingerprints to work on D22-D29 (# 2819, # 2825 and # 2827), assigns the analog ports as you suggest in another forum MCUFRIEND_kbv - Reassignment of Control and Digital Pins # 5).
I changed the YP, XM to A4, A5 and YM, XP to 23, 22.
Now everything works perfectly. The shield's response seemed to me faster than in a UNO regular.
Congratulations for the great work and thanks for your help.
Daniel