Comments on: LCD Monitor Troubleshooting 101

By: Kwai Chang

Kwai Chang — Sun, 08 Nov 2009 21:44:58 +0000

FWIW, I got it to work. Had to set the computer up for shutdown, with the final mouse click waiting. Set the input to DVI in the monitor’s menu, then clicked the mouse. PC shut down, then I detached the VGA from the video card. That seems to have been the secret, along with doing a cold boot. The monitor found the input, and it works now.

Thanks anyway!

By: Kwai Chang

Kwai Chang — Sun, 08 Nov 2009 17:30:12 +0000

I have a new flat screen monitor. When using the VGA connection to the PC, the desktop has ghosty wavy lines. I replaced the cable with a DVI cable trying to eliminate the lines and increase the quality of the picture. The PC has DVI-I output, the monitor has DVI-D input. The cable is DVI-D to DVI-D. When selecting the DVI input on the monitor menu, the screen goes black.

I can find no information that allows selecting either VGA or DVI output from the graphics card, so must assume they are both hot.

What can be wrong?

Thanks,

By: oliver

oliver — Tue, 29 Sep 2009 13:24:53 +0000

Had A Red Monitor Thanks You It’s Now Gone

Many Thanks

By: Rich Menga

Rich Menga — Sat, 19 Sep 2009 02:59:17 +0000

Might get lucky here finding the schematic for Neovo: http://www.eserviceinfo.com/equipment_mfg/Neovo_3.html

By: Steve

Steve — Sat, 19 Sep 2009 00:35:05 +0000

Hi all,

I’m an old electronics tech from the navy and know that everything we use is repairable. The only thing lacking for me is the whereabouts of block diagrams and schematics. Are there any available? My Neovo is experiencing a vertical line problem. I can rap the side and get it to stop displaying these random lines. Sometimes the screen is full of them other times it is only in small rows. My first task will be to open the case and see if there are any obvious problems. The next thing to do will be to resolder the components that are subject to heat. I might use a plastic wand or a toothpick and tap around on different components until I find the one that is causing the problem.

By: Zoh

Zoh — Sat, 12 Sep 2009 15:37:09 +0000

Hi,

I have a compaq presario v5000. My lcd screen recently started giving me problems. 1/3rd of my LCD screen went black. My laptop readjusted the screen side to the 2/3rd portion and I can see the entire desktop. However, the top 3 inches of the screen are displayed on the bottom 3 inches as well.

I cant figure out what the problem is. Is it dead pixels ? But does the computer readjusts itself to a new screen size ?

Please advice. I can also mail you a picture of my lcd display if you provide me your email.

Thanks.

By: ANTHONY

ANTHONY — Fri, 07 Aug 2009 03:01:46 +0000

I am working on a Westinghouse 19 inch flat screen lcd there were two capacitors that were questionable as the tops were sticking up not like the rest of them which were flat, I replaced all of them with the correct values, still not getting no voltage to the bulbs.
Any other ideas on what to check????
Before changing the capacitors the light on the side of monitor would stay green as long as video was going to it, but no light to the display, this monitor is not two years old.
Would appreciate any help or suggestions—-

By: Dan

Dan — Fri, 12 Jun 2009 13:15:25 +0000

If you were located in central Ontario, I would be glad to try and revive as many of those HP’s as possible…

By: John

John — Fri, 12 Jun 2009 12:23:45 +0000

Thanks for reassuring my initial thoughts. I have 25 or better HP 1740’s that I can not find schematics for, but fortunately I have a working one for comparison. These all power on and initially and show with the back light then either flicker or just go dark yet the monitor still still indicates a valid signal. I did not notice swollen caps but it wouldnt be the first bad cap that doesnt show visible expiration. as soon as I get spares I will post the results.

By: Dan

Dan — Thu, 11 Jun 2009 20:44:14 +0000

Defective capacitors are common, soldering issues are next, due to heat. I will usually test and replace all electrolytics, then go over the boards and resolder everything.