Solution found: LCD 20X4 Display Problem - Only top two lines display characters

Zapro -my Handle/Nickname.
Zapro.dk - my website.
Per Jensen - my name :slight_smile:

With that aside, try to bend the tabs (that hold the frame in place) straight - carefully remove the LCD glass and two zebra-strips. Keep note of the orientation of the glass! It can be somewhat stuck, so pull slightly on them.
Clean all parts in isopropyl alcohol. Do not get finger grease on any of the parts!

Re-assemble, remeber to press down firmly on the metal frame, before bending in the tabs again.

If this doesn't work, you have a dud display.

// Per.