White screen

Hello i have a APS230 since 3 years but i never used it for more than 1 minute per sesion.
But now i am using it in my work and i find a big problem, when i am using it for more than 2 minutes the screen begin totaly white and i cant do nothing, if i wait for a minute or plug out it repair for an other 2 minutes.

I have change the batteries and use only the power supply and use a laboratory power supply to plug in the batteries conector but the problem don’t repair.

Sorry, we have no experience with this problem.
If you wish, you can return the unit for inspection/repair.

Please return it to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium