Question about ViewSonic VX800 18" Flat Panel LCD Monitor

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Vx800 flickers when cold

I have a Viewsonic VX800 that flickers when it is first turned on.  No picture distortion, just brightness varying randomly for the first 5 minutes or so.  It did it when it was new but only for a few seconds, now it's several minutes.  Do I need a new CCFL backlight?  thanks

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  • Anonymous Oct 04, 2008

    I have this same exact problem except it has gotten to the point where it takes 15 minutes to turn on

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I have repaired several Viewsonic VX800 monitors. The symptoms include a power light that flickers or flashed on and off or a screen that flashes on briefly or stays off. The problem is bad electrolytic capacitors on the power supply board. These bad capacitors do not look bad and do not swell but they do develop a high ESR (Equivalent Series Resistance). You need a ESR meter to check them. But if you have these problems, you should assume the capacitors are bad and just go ahead and replace them.
First you must open the monitor and gain access to the power supply board.
1. Remove the stand: It is held with 6 screws on the back. Also on the back are 2 black screws that must also be removed.
2. Remove the button bar from the front, bottom: It is pried off. This will expose the 2 screws holding the front plastic bezel.
3. Remove the silver plastic bezel from the front: First remove the 2 screws holding it, then you can pry the rest off. This will expose the 2 screws holding the screen to the plastic back.
4. Remove the screen and electronics from the plastic back: Remove the 2 screws holding it. The 2 speakers are glued to the plastic case. Cut the glue with a knife. The screen and electronics and speakers should lift out of the plastic back.
5. Remove the metal cover to expose the electronics: There are 2 screws holding the VGA connector and 2 screws holding the DMI connector. There are 9 screws holding the cover. These must all be removed. There is a black plastic sheet glued to the lower edge of the cover. It must be lifted. The cover should now come off.
6. Replace the bad capacitors. The power supply and signal processor are on the same board. It is marked VG800-2. The bad capacitors are surfaced mounted 100UF 25V. The bad capacitors are CM16, CM17, CM2 and CM165. The two most critical are CM16 and CM17, but they all read high ESR, so I just replace them all as long as I have them exposed.
Reassemble in reverse order.


vx800 flickers when cold - dcc852a4-9a14-4b0d-9886-ab2efc735bb2.jpg

Posted on Apr 17, 2013

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Posted on Jan 02, 2017

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benwabnick
  • 2404 Answers

SOURCE: viewsonic vx800

Its a problem with bad caps on the power board, problem is that it would cost you more to fix it then to buy another monitor cause your looking at the cost of either capacitors or a whole board if it can't be repaired component level and labor.

My suggestion is to get a new monitor. The repair cost would exceed the cost of a new monitor.

Posted on Feb 10, 2009

MNfisherman
  • 11896 Answers

SOURCE: when i plug in my ViewSonic VX800 monitor the

This would be a problem with the voltage transformer (power supply) or a loose wire.

Posted on Dec 13, 2009

Testimonial: "Thanks for pointing out the problem, so how do i go about fixing it?"

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I have repaired several Viewsonic VX800 monitors. The symptoms include a power light that flickers or flashed on and off or a screen that flashes on briefly or stays off. The problem is bad electrolytic capacitors on the power supply board. These bad capacitors do not look bad and do not swell but they do develop a high ESR (Equivalent Series Resistance). You need a ESR meter to check them. But if you have these problems, you should assume the capacitors are bad and just go ahead and replace them.
First you must open the monitor and gain access to the power supply board.
1. Remove the stand: It is held with 6 screws on the back. Also on the back are 2 black screws that must also be removed.
2. Remove the button bar from the front, bottom: It is pried off. This will expose the 2 screws holding the front plastic bezel.
3. Remove the silver plastic bezel from the front: First remove the 2 screws holding it, then you can pry the rest off. This will expose the 2 screws holding the screen to the plastic back.
4. Remove the screen and electronics from the plastic back: Remove the 2 screws holding it. The 2 speakers are glued to the plastic case. Cut the glue with a knife. The screen and electronics and speakers should lift out of the plastic back.
5. Remove the metal cover to expose the electronics: There are 2 screws holding the VGA connector and 2 screws holding the DMI connector. There are 9 screws holding the cover. These must all be removed. There is a black plastic sheet glued to the lower edge of the cover. It must be lifted. The cover should now come off.
6. Replace the bad capacitors. The power supply and signal processor are on the same board. It is marked VG800-2. The bad capacitors are surfaced mounted 100UF 25V. The bad capacitors are CM16, CM17, CM2 and CM165. The two most critical are CM16 and CM17, but they all read high ESR, so I just replace them all as long as I have them exposed.
Reassemble in reverse order.

6f08b093-ac4d-4146-bfa7-440b0a683458.jpgdf2efd27-00c9-4e68-a4c5-31ba1cdd65e2.jpg

Feb 10, 2009 | ViewSonic VG800 18" LCD Monitor

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