How to open up the casing on this monitor.

I am a service engineer - I believe the Tatung L50 monitor I have has an internal power problem (no display at all, and no backlight).

There appears to be no easy way to open it up - Aside from four screwtwist holes at the bottom to (apparently) remove the front casing.
From looking at it, there appears no way at all to remove the stand from the back of the unit.

Could someone with knowledge of this monitor tell me how I can open it up, please?

Thanks
Chris