Hi, New member but old VL-X5 user. I realised today that one of the monitors does not make any sound, although the led is on and any bad cable issue has been excluded. Trying to see if the problem was caused by any minor issue that can be easily fixed like a solder joint or something due to a small bump several days ago (otherwise it could be a transformer issue in which case i will not touch), my problem is that I cannot remove the rear panel although I have removed all the outer screws. Is it stuck or is it any other thing I havent thought about? Thanx!