Acer at3201w trouble

[wwizardone]

Hi I am new to this sites looks like alot of good info. Anyways I have a Acer at3201w lcd tv/monitor that worked fine then the screen just seems to have lost the picture. When I turn it on I can hear the audio from the input and the screen lights up as if it is turning on but no pic. Also the buttons on the front work sometimes. I have opened it up and could not find any visibly blown caps. I think it maybe the mainboard. I have found a replacement part but not sure if this is the problem, any help would be greatly appreciated. Thanks