Question about ViewSonic VG150 15" LCD Monitor

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Power switch behavior

Hi, For a while, we had to press the tactile switch many times and soon or late, the logic turned on. Then, to avoid this, we left the monitor on all the time. When the computer was turned off, the monitor was turning off but was not really turned off by its switch, the led I think was switching to an idle color, so when turning the computer on, we did not have to face any problem because the monitor was turning on. Now, it is dead. that workaround does not work any more. At a service shop, they told us an IC has to be changed. We do not know which one. Can anybody help on that? Tanks.

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Re: Power switch behavior

Kbzaloka: That is not a solutiom you posted. If you can't help, then don't post anything.

russolini: I'm having the same problem with a monitor on my bench right now. I did fix another problem it had. It seems some of the surface-mount electrolytic capacitors are going bad. I will let you know if I solve this fault too. If anyone has lines going through their display, and the sides look ripped or torn, your pixel clock is not working correctly. Try replacing the 22uF capacitor C46 right above the pixel clock generator IC09. This should smooth out the 3.3V supply for this IC and correct the problem.

Posted on May 06, 2009

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Re: Power switch behavior

Well my friend, there are people that have courses , studies , school etc to know "which one" they are called "Technician, Engineer,etc" they can help you...

Posted on Jul 13, 2007

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Sounds like the tactile switch is faulty. You know on a telly remote, you press the button to select the channel....well the switches on the monitor are the same. Behind the switch is a rubber contact which has a conductive contact which you must not clean( as such) it sounds like this is in permanent contact with the conductive elements inside it. As the switch is probably only 5mm x 5mm, it is a tricky DIY job to put a new tactile switch in, but easy for someone who does electronics.

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malik4786, Could be that the "internal switch-mode-power-supply" is no longer paying any attention to a perfectly "good" switch!!!! MTBF for typical tactile switch is 10k to 50k actuations or more. Do some extensive reading here!! >>>> Then if still in trouble, do another reply to this same posting and we will try to help. 12fixlouie

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Volumn buttons

Go to Tandy, buy a tin of switch cleaner with a lubricant in it.

Servisol is a good make

Turn the power off and give the switch a good spray , cover the screen with some newspaper or tissue

Work the switch repeatedly for a minute or so

Wipe off the surplus liquid and test

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