Frozen display on pm753

Hi,

I did read your question on abb pm753 frozen display below. i encountered this problem and wonder how u solve it or did u find any solution to this issue..thanks

"Frozen display ABB pm573 issue

I have a pm573, it worked well a lot of time but yesterday i powered it on and the display was frozen on startup, showing "AC500" all time, the display dont changue and the run led and the err led are turned off despite the run led should be red or green but not off. The power led is on

also the display dont show backround light.

My power supply is ok, tested with polimeter. I havent caused any short circuit.

Please i would like you to help fixing this if is possible

Sorry for my medium level english.

Thanks"