Alde 3020 replacement colour touch display screen 3"x 2 1/2" Standard size Brand New with protective film 
Also replaces Alde 3010
Remove 12v power cables first at the rear of the control panel
Simple to replace just unclip the 2 internal display 5 way & 50 way  flexy PCB connectors  *****push back the black flexi PCB retaining tabs on the PCB first***** pic 4 then remove the flexi PCB s
Retaining tabs 50 way moves horizontally 5 way vertically will move approx 1 mm 
Push back the 4 external plastic retaining clips pic 2 unclip  2 on one one side and the display will come out on both sides  Pic 5 
( some displays on removal have a double sided tape)
Replace the flexi PCB's in the same orientation as removal ( take your own pics to make sure).
Please note be careful unclipping and reclipping with the PCB connector retaining tabs as to much force will damage the 5 way & 50 way connectors.
Remove the protective film when fitted and reconnect power
Additional information 
Chris
International, Scottish highlands + Islands & Ireland please check P&P with me first