Question about ViewSonic VX900 19" LCD Monitor

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VX900 POWER LITE COMES ON WHEN MONITOR IS PLUGGED IN, BUT IT BLINKS ( ABOUT 4 PER SEC ) AND IS ORANGE -- THE POWER SUPPLY CHECKS OUT OK AT 12 VOLTS -- THANKS !! AL at ALTEN0@COMCAST.NET -- BOULDER, Colo 80302 -- WHERE CAN WE GET SERVIC MANUAL FOR THIS MONITOR ??

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Hi
Even though you show 12 volts, you could still be coming up short in amps on your powerboard.
Updating the capacitors (all of them except for possibly the main) may correct this.
If that doesn't do it, then the inverter is the next target to check.
Fran

Posted on Oct 11, 2008

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I have a vx900 internal power supply. Wont power on at all so I checked the caps, seems good, I tested the power supply, 11 volts out of the unit but 2.5 volts when it is reinstalled. What do I need to do...


There are two version of this monitor, one has built-in power supply, another one uses 12vdc adapter.
Adapter:
http://lcdpayless.com/productpage.php?productId=4629

The adapter is REGULATED 12vdc 6a power supply that can handle the load up to 6a, if when is has load on it and the voltage drops down to 2.5vdc, teh it is that the power supply is bad or you have shorted circuits in the monitor. You can test the power supply using 12v car lamp such as #1157 bulb to test your power supply under load.
Caps in the power supply do go bad as you can see in my pictures here:
http://s807.photobucket.com/albums/yy352/budm/Bad%20capacitors/?action=view&current=badcaps2.jpg

Mar 10, 2011 | ViewSonic VX900 19" LCD Monitor

1 Answer

When I push the power on button.I've taken It apart and tested the power supply board,240volts AC Is going In at the edge connector but the DC out connector shows no dc volts coming out.


Check all fusible links (such as 0 ohm resistors) and the voltage regulator as well as the rectifier.
You may also have a shorted capacitor, check all electrolytic caps.

Feb 23, 2011 | ViewSonic VX900 19" LCD Monitor

2 Answers

LED blinks in milli seconds and the images appear too late.


If your lcd comes with ac adapter open this and check for blown or bulge capacitors, replace this with same value.

If your monitor comes with plug cable, open your monitor (too risky to do it by yourself) check the power supply section, check and replace blown and bulge caps.

Jul 09, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

Have an old view sonic vx900 (~5yrs old). When you


Check the fuse on the inverter board and also verify it does have have 12vdc feeding the fuse. Worst case will be the lamps, power supply caps look OK?

Jan 18, 2010 | ViewSonic VX900 19" LCD Monitor

1 Answer

My ViewSonic VX900 won't turn on. I have had it since late 2003 and it has operated flawlessly. Went to turn it on; nothing. No light, no standby light. Checked the power cord against another monitor and...


Hello,

The VX900 has 2 different version of the unit. One version has an external power supply and the other has internal power supply. Since you said you changed the power cord I would guess you have the internal power supply version. The issue you have is caused by the capacitors on the power supply board have overheated and blown out. This is a common problem on many LCD monitors after a few years of use. If you open the back of your monitor and look at the supply board you should see the bulging capacitors. Check our web page at: www.ccl-la.com for Pictures and examples of what to look for and what you need to get to do the repair. If you have any questions let us know on our web site and we will be glad to help you get going again.

I hope this helps, If so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com

Jan 12, 2010 | ViewSonic VX900 19" LCD Monitor

5 Answers

What voltage is the dc adapter?


You will need at least a 4 amp rated regulated 12 Volt power supply.
These are commercialy available from most electronics parts suppliers.
They come on a circuit board. You can mount it in your own case and
use the original Viewsonic wire end. If you do a google search for 12
volt reglated power supplies you should find many of these.

However, with a second-hand Sprint AC adapter with 3A,
12v adapter, the screen blinks on and off
intermittently. Obviously there is some difference here between a class
2 adapter and a power supply box.

Oct 03, 2008 | ViewSonic VA520 15" Flat Panel LCD Monitor

1 Answer

Monitor light blinks


have you tested the power supply connection feeds? test each connector I think you will find your power supply has failed on either the 5 volt or the 12 volt side more than likely 5 volts are down' the agp adapter needs 5 volts to run. since you have changed out every thing else I would replace that or test your dads power supply in your computer, that should do the trick

Apr 28, 2008 | Samsung Syncmaster 730B 17" Flat Panel LCD...

2 Answers

Monitor blink


1. this is may be due to the 5 volt power supply. which may be down. the current u can measure is ok (5volts) but the ampers may be down. because in off or stand by position it consume very little current but at the time of self test it consume more then 900 milliamps. ( replace the regulator of 5 volt)
2. May be the EHT transformer drive transistors are short. check them, if there is any leakage or if they are short then replace them.

Jan 22, 2008 | Dell E173FP 17" LCD Monitor

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