I can confirm this solution with a new 629GL-70NP from mp3car store.
The codes in the beginning doesn't match this new model and the procedure has to be the one mox described earlier in this thread.
1) Completely disconnect the 12V power cord from your lilliput
2) Reconnect power and turn the lilli on by pressing the power button (on the screen)
3) Now, while in VGA-mode, enter the numbers (588998) directly, i.e. without first pressing any other keys or activating any menus or whatever.
now to set auto power on with 629GL-70NP:
My default values were 129 0 1 1 0
Changed the 5th number (thanks wasyed) to get 129 0 2 1 0 and then pressed a random number on RC to store the new setting.
Works like a charm!