I have the model VG800 LCD and have looked for the schematic online, but have not found it yet. However, here is the problem. When I power it up, the green light lites, then an image flashes for a half second then disappears. The light remains on. It can be reset, and the process repeats itself. I tested the external power supply with a 5 amp load, and it manitains 12 volts. So I assume there must be a logic switch internally that trips off. Can anyone familiar with this model give me more specific ideas? Thank you.
Les