I am assuming that one of you have installed a replacement screen? It is hardware related and it is very hard to correct this problems by software alone (maybe OMA can help if he has solved this problems for any users in the past before, but dont count on it, he has other things to do)

Even if you think you got the right replacement parts, it is sometimes not the exact parts. The picture below illustrates the problems based on my personal experience.The usual reference to replacement screen P/N is the main interface cable but it is paired to different interface circuit for different brand/devices/revision. You might get ALL the P/N right but lets say it for another hardware revision (might work, might not work)