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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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Viewsonic LCD Monitor - Power problem
Model# VG191B
The problem with this monitor is that sometimes if you press the power button, the unit will come on. If its on and then press power to turn it off, it will shut off but may not turn on if you hit the power button again. You may have to press power for a few to many times to get the unit to come on. The power LED flashes for a split second while you press the power button but the LED comes on when the rest of the unit comes on. I have no service manual for this unit. So, if anyone can help me with the problem or send the service manual to me it would be greatly appreciated. Thanks in advance! Tyrone |
#2
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The fault can be in the power supply or uPC section. This is a bit
sophisticated a problem to have a simple answer over an email. You would have to track this down, starting from the power button to the microcontroler, and then verify the clocking and data commands for it. The very first thing to verify is the power supply performance. This is most important that all the outputs are in spec and the noise characteristics (filtering) is in proper specs. You will need to buy the service manual, and have a scope and DVM to fix this type of thing. In my opinion, if the CRT is in good condition, I would suggest you give the set out to an authorized Sony service center to have it properly serviced. This would be more fasible than to fix it yourself. Jerry G. ====== |
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