Question about ViewSonic VG150 15" LCD Monitor

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VG150 power switch defunct

I have inherited a VG150 and it has a dead power switch. How do I open the case to replace the switch? I plan to install a cheap switch from Radio Shack doing a bit of soldering and gluing something over the hole where the original switch was. I undid all the screws but can't get the case apart. I don't want to risk breaking it. How do I open the case?

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  • hump234 Aug 21, 2007

    Thanks. I have the back off. It is the switch because that was what had been problematic for months. It had needed several prods to get it to work each time. I bridge it with a screwdriver and the monitor goes on or off as required. I bought a switch from Radio Shack, will solder that in and build a new switch housing (it's a bigger switch).

  • Anonymous Mar 27, 2014

    It's got a bit of caseing at top on the back of the tower with rectangle hole with a little pad lock above it you can slide it back how do I open it

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1 Answer

There are tabs along the sides so you need to remove all screws and then use something like a screwdriver to pry it open... careful not to scuff the plastic. Anyhow the switch is probably fine and your main board is dead. There are several posts on the web about this issue, and mine had the same problem. Once I replaced the main board I found on ebay, it worked just fine.

Posted on Aug 18, 2007

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My LCD monitor doesnot power on. There is a problem in the power circuitry and is there a replacement part for this. Part model no. written on the board is: FM-20A02/AAA/AAB


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I have a viewsonic vg150 and the led on the board is lighting but the power don't come on what could be the problem.


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You can pull the offending cap or just do what I did and replace ALL the caps on that part of the power circuit. It isn't expensive and the board is big enough to handle soldering without a lot of hassles.

I did this for an old Dell monitor this past week and it is up and running!
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