Question about ViewSonic VX924 19" LCD Monitor

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Viewsonic lcd problem

My lcd viewsonic monitor is flashing off and on for about 10 to 15 minutes and then it stops and acts normal. What is wrong with this?

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This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

Posted on Feb 14, 2008

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Posted on Jan 02, 2017

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Two capacitors on my Viewsonic VG2021m popped so had them replaced, no others appeared even slightly dommed to signify they had blownm though the monitor still isn't working. Plug it in to the wall and...


Bad cap can look normal but can have high ESR, I always replace them in a set, and you should use LOW ESR type with 105c rating since we are dealing with switching power supply here. Look at the bottom seals also.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VG2021/

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Jan 05, 2011 | ViewSonic VG2021m LCD Monitor

1 Answer

My viewsonic VA912b goes thru a few minutes of a cycle upon turning on or waking up where it has a black screen, then a few seconds of normal display, then 10-15 sec of black, then a few seconds of normal,...


Look for bad caps as shown in my pictures, common problem in all brands of LCD monitors.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VA912B/

Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

May 10, 2010 | Computers & Internet

1 Answer

VX922 monitor, blank screen, blinking power light



If there is a flashing led on front of the monitor, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1 The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours, sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr suddenly are a blown capacitor on power board, the inverter board powering up backlight lamp has blown, or a fault on main lcd controller board.
check also the video cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Check connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact Viewsonic to find out a Viewsonic service point.
See:ViewSonic - Support & Service

If you want to repair at your own expenses, just locate any good qualified repairer.


Regards

Mar 03, 2009 | ViewSonic VX922 19" Monitor Flat Panel

1 Answer

The blinking green light on VX922


If there is a flashing led on front of the monitor, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1 The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours, sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr suddenly are a blown capacitor on power board, the inverter board powering up backlight lamp has blown, or a fault on main lcd controller board.
check also the video cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Check connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact Viewsonic to find out a Viewsonic service point.
See:ViewSonic - Support & Service

If you want to repair at your own expenses, just locate any good qualified repairer.


Regards

Feb 26, 2009 | ViewSonic VX922 19" Monitor Flat Panel

2 Answers

Viewsonic va720 monitor


is it that whatever u try the screen does not come alive???????

was there a voltage spurge or something maybe an IC blew up..


could u tell me when did this happen

Oct 22, 2008 | ViewSonic VA720 17" LCD Flat Panel Monitor

1 Answer

About a problem in my viewsonic monitor


Hi

Actually the common problem of viewsonic LCD monitor is bad electrolytic capacitor at primary, secondary & inverter area, if your lcd using power adaptor test the voltage out, use analog or digital tester range 50v dc, if the voltage out is accurate dont be sure to your adaptor working good, open it and find bad electrolytic capacitor inside. That is common problem of viewsonic LCD monitor could cause of display flashing then back to black after few seconds. Suspect inverter area lastly mainboard.

Gud Luck!

Oct 06, 2008 | ViewSonic VE710s  (Black, Metallic...

1 Answer

Viewsonic vp930b-3


MY VP930b has the same problem.
It takes a very long time (5-10 minutes) before it becomes normal.

Aug 04, 2008 | ViewSonic VP920b 19" LCD Monitor

1 Answer

Starts up looking good then in 3 minutes, all hell...


Go to the ViewSonic site and read through their knowledge base on your monitor.

Then once you familiarize yourself with electronics safety by reading through a basics manual once or five times, and once you've got it, open up the monitor cold and/or hot, and find out where they spilled Coca-cola down the back or whatever might be suggested by the ViewSonic knowledge base.  Lather, rinse, repeat; when the monitor acts right, then stop.

Dec 09, 2007 | ViewSonic VA520 15" Flat Panel LCD Monitor

1 Answer

LCD Monitor has no video


Sounds your monitor has either blown a backlight or the inverter board is bad. Either way they can both be replaced, but tracking down the parts will be a bit difficult. But your LCD Monitor is in trouble! Sorry!

Oct 03, 2007 | ViewSonic VX910 19" LCD Monitor

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