My BG808's picture gets distorted after about 30 minutes. The problem starts at the top, and moves down to about half the image height in about 5 minutes. The shape seems to be always the same, and note that the picture is actually wrapping around right to left. Apologies for the bad pictures. The bright vertical stripe at the top is just an artefact in the pictures and not part of the problem.
http://filetype.org/image12.jpg http://filetype.org/image21.jpg
The problem goes away for a short time if I turn the projector off for a few minutes, so it's probably some component heating up. The problem is less severe with lower frequencies, i.e. 480p hasn't shown it yet, but 768p or 720p do. All colors are affected in exactly the same way, i.e. the distorted part of the picture is properly converged. Which board could cause this, and what can I do to fix it?
http://filetype.org/image12.jpg http://filetype.org/image21.jpg
The problem goes away for a short time if I turn the projector off for a few minutes, so it's probably some component heating up. The problem is less severe with lower frequencies, i.e. 480p hasn't shown it yet, but 768p or 720p do. All colors are affected in exactly the same way, i.e. the distorted part of the picture is properly converged. Which board could cause this, and what can I do to fix it?