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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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ViewSonic monitor spasm
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 |
#2
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ViewSonic monitor spasm
les wrote:
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? Most likely* bad caps or decoupling in the supply to the (backlight) inverter. Viewsonic's are plagued with this problem. *YMMV |
#3
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ViewSonic monitor spasm
responding to
http://www.electrondepot.com/repair/...asm-21580-.htm , SolarAngel wrote: idea wrote: 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 -- have similar problem only thing is that monitor shows screen after several minutes. by any chance do you remember what was the issue with this monitor thanks. |
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