Hello, recently recieved a montor where panel works but is dark at 1 corner, meaning no light behind it, is it possible to fix it. in thery it should since when plugged in or turned on it works for aroun 20seconds- 1 min and then 1 corner loses its panel light but it works the same, so my guess is that some connections are loose or there is a short somewhere in between? anybody have any good idea and knowladge how to fix?