Question about ViewSonic VA550 15" Flat Panel LCD Monitor

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Won't turn on, doesn't respond to Power button at all.

Confirmed I'm getting 12V, and there is a green LED inside on the video board that is lit. I'm not talking about the Power LED on the front. Pressing the power button does nothing. No sounds, no signs of any kind. No fishy or burnt smells, nothing physical that I can see. Cables all plugged in, and I went ahead and reseated them.

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6 Suggested Answers

SOURCE: Monitor Continually Goes Blank

I had a similar problem with a Westinghouse 19" LCD. Had left power on while running errands, but came home to a black screen. I could cycle the power and see the desktop image but it would go black after 2-3 seconds.

Out of curiosity, after cycling the power, I immediately pressed the monitor settings button, and was able to get into the menu . . ., no black out . . . I changed the brightness setting and crossed my fingers while I let the setting menu time out . . ., lo and behold, it's working again.

Perhaps Mark could comment as to why this might have worked.

. . . and yes, I do feel lucky . . .

Posted on Apr 23, 2008

  • 1635 Answers

SOURCE: VX900, Backlight Works, But no picture.

It is impossible to see defective components visualy, unless there was a serious burn-up or something like that.

Without at least a DVM you cannot even verify if the power supply is functioning properly!!!

There is no support at the component level service for these monitors. The service tech will change the main input board to solve the fault that you have. If the back plane lamps are failed, he will change the power supply for the back plane lamps. In some of these models, the back plane lamps are not replaceable. This means that the screen would have to be replaced.

If you want to service the monitor the non supported way, call Viewsonic and see if they will sell you a copy of the detailed schematics, and engineering data for the boards. Most monitor companies will not sell any schematics or service information to no authorized contractors for their service.

If you can have the details, get a digital scope, a DVM, a logic analyser, and start troubleshooting according to the service manual. This can involve hours of work to figure out the fault. Then you will have the task of seeing if Viewsonic will sell any of their proprietory EPROM's or processor type parts.

This is why when the warranty is finished on these monitors, they are not worth to send back for service. The shipping cost, plus the parts and labour can come out to more than the monitor is worth!

Jerry G.

Posted on May 19, 2008

  • 9 Answers

SOURCE: I have viewsonic 1703wb monitor. Often Monitor power went off

Check the power cable. If it uses a power brick style assembly (like a laptop) it may need to be replaced. Some power bricks can break a wire at the base of the brick just enough that it causes a short in the system and shuts down the power flow.

Posted on Mar 19, 2009

  • 3085 Answers

SOURCE: ViewSonic LCD Monitor Went Blank

It is probably a bad INVERTER and / or backlight fluorescent bulb.

Posted on Jul 02, 2009

  • 1684 Answers

SOURCE: ViewSonic Vx924 No power


If youcan take a picture or two of the boards in your system as close and clear as you can and go to our web page and email them to me I will check and see if we can help you find the problem.

Corporate Computer

Posted on Aug 14, 2009

  • 1684 Answers

SOURCE: Viewsonic VG2230WM....I have replaced both


You have one of two things wrong. One the new power supply board may be bad, we have seen quite a few power supply boards purchased on Ebay that are just as bad as the ones people are trying to replace. They send them to us for repair along with the original board and both have bad capacitors installed. Many of these boards are coming in from PC recyclers that are just striping monitors for parts and not rebuilding the boards before the sell them. Check the tops of the capacitors for bulges if you find any them the board is bad.

If the board is in fact good then the cause is bad florescent back light bulbs in the display panel. When the fail they pull to much current trying to light up and this trips the over current circuit in the power supply board which shuts the power supply down to prevent damage and this turns off the display. The bulbs can be d but this will be a very involved project. You can do a Google search for instruction on this process but keep in mind this bulbs are very fragile and thin, easy to break.

I hope this helps. If you have any questions just reply to this answer.


Posted on Aug 22, 2011

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Check the electrolytic capacitors inside in the power supply board portion. replace all busted ones.

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I have two monitors. One Samsung SyncMaster 2233 an one Samsung SyncMaster 2243. My problem is that the SyncMaster 2233 for some reason is totally black. I'm usually not terrible with these things, but my...

hello Gabriel

Could you check your SyncMaster 2233 for me and tell me your findings. If this monitor is connected from your computer and when both switch on, did the led indication lamp from your monitor lit steady green? or this lead indication lamp lit green then turns red?

1. If the led indication lamp lit steady green then there is nothing wrong with the settings, configurations, driver or hardware on your computer. The problem would be the backlight inverter lamp in your monitor is busted. Or it could be the inverter board that supplies high voltage for the backlight inverter lamp that is bad. You can replace the backlight inverter lamp located at the upper and lower part of the monitor with a replacement part you can purchase at Inverter board repair can be risky if you don't have the skill. Even opening the back cover of your monitor and replace by yourself the inverter lamp is risky too, could inflict more damage. you can bring it to a local professional service man.

2. If the led indication lamp lit green then turns red, then if not the video card the power supply section from your monitor is bad, you can replace polarized capacitor with same value. Just inspect and those with blown or leaking capacitor. You can also check the terminals and solder joints for the 15-pin vga terminal connector where vga cable is connected on your monitor. Resolder the terminals.

3. If the red indication lamp did not lit at all. Power supply section in the monitor is bad. You can check the output voltage from the power supply section. +5VDC is supplied for the main board and +24VDC is for the inverter board. Replace leaking or blown capacitor with same value.

Just remember, this should be done when computer and monitor is turn off
Post back if you have more questions. I am willing to give you assistance.

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I have viewsonic va1912, when i plug it to my main outlet the led lgiht turns blinking green.... I already replaced some capacitors, 2200uF 10V, 1000uF 25V, 1000uF 10V, 220uF 25V but the still the same,...

What DC voltgae are you getting on the 10vdc rating caps, it should be 5vdc, and 12_18vdc on the 25vdc rating caps. You should check with the load such as 12v 1157 carbulb but do not hit the power button (make sure the power is off, the power supply is always running without the power switch activated) because we want to see if it will maitain 12v with external load not with the inverter circuits.

Basic LCD monitor troubleshooting guide:

Failed TV and Monitors:
Capacitors kit: he can make you a set of caps for you.
Please post back what you find.

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LG STUDIOWORKS 500G monitor dead ?

your irf 630 is not original purchase it from proper LG authorised service centre it is costly but never become faulty again duplicate mosfet overheats if your green led is on then measure voltage at E.H.T.connect meter at output transister if E.H.T. is producing then meter should show 1 digit if not then 50v will show take care that signal cable should be disconnected if E.H.T. is not producing then check +vcc at horizontal ic it should be 12v. if 12v is not present then check regulator ic 7812 insmps

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My B70A Hyundai will not power on. The green or amber light will not power on. I wanted to make sure I have the correct Plug. Are there any drivers or is it plug & Play? Thanks Lesa

This monitor is plug and play but the driver (or lack of) is not the problem.
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