Over the last while my monitor started showing noise on the top of the screen, it looks like lines (wavy or not) and it has progressed along the whole screen. It is ok when viewing just the wallpaper with a lot of colours and darker, but gets worse when opening a screen with a lot of white in it, to the point that it is unreadable. I tried an old fashioned CRT, and that worked fine, exchanged the cord, with no difference. And when I turn the monitor off and on again, it is good for about 5 seconds, then it comes back. It does not look like my computer, but seems to be the monitor only.
Re: Severe noise on monitor when viewing white area
Although I still have the problem to a slight extent (very slight wavering of the vertical lines going from dark to light or white) reducing the contrast from 100% to 80% seemed to do the trick. Although this monitor is on the way out, it has lasted about 7-8 years now, at least it will keep going for a while.
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Slap or Tap the monitor to see if it\'s a mechanical or connector type problem.
Does it happen when left alone or nobody near?
Change the AC Plug to another outlet or on a different phase.
Noise on incoming AC lines is usually removed by a Toroid filter inside the unit. But low voltage or brown outs can cause weird faults in logic circuits.
If you suspect interference from an external source then a piece of Aluminium or Tinfoil connected to a ground pin might shield external noise around the monitor. There is a lot of electromagnetic noise in households these days with WiFi, BlueTooth, 3G, and microwaves etc.
Depending on what you find above....I would perhaps check inside for cock roach residue between components. Sometimes they gather in this warm environment and their droppings can short chip legs together to cause weird problems.
(I had a Sony bedside clock/radio that has an LCD screen & the iPhone connects to it to show photos & play music etc. So it was expensive & I didn\'t want to discard. The Clock had been showing 2009 for the last 9 months & it could not be reset from the controls or battery removal etc. It was starting to annoy me. So, I opened up the unit to inspect & noticed a small gunky spot near the pins from a IC Chip. Similar to solder flux but it wasn\'t, It was probably insect crap. Once I cleaned this out the unit returned to working condition.)
Take the back cover off and inspect.
Check for cold solder joints & moisture / condensation and leaky electrolytic capacitors (Bulge on Top of Cap) & touchy connectors.
Use a paint brush to clean or a tooth brush for stubborn junk.
CAUTION.. The switch mode AC Power Supply area can be lethal but all other areas in LCD monitors are now low voltage 5-12v DC.
The white glow with no picture means that either the ribbon cable connection between the logic board and the monitor has come lose or dirty contacts, or the LCD Controller (T-CON) board (part of the LCD panel is not getting 5v or 12v depend on LCD panel from the logic board or the LCD controller board has blown fuse, see pictures here for guide (note pin on the LCD board with arrow mark is pin 1 and is the incoming DC power supply line): http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/?action=view¤t=DSCF0881.jpg
You may also want to look for bad caps (bulging top) on the logic board. There should be 5vdc feeding the logic board also.
Open this link and make it full-screen. Watch the screen for 20 seconds or so to see if the line of lit (white) pixels remain.
If this line remains during this, and even when the the computer is first starting up, it is most likely a row of "lit" pixels caused by a faulty connection or circuit inside the display.
While you can sometimes rub the area of the screen near a single lit pixel, an entire line of them usually denotes a more complex problem that can only be fixed by having parts replaced by a technician
Note: Be sure all of your cable connections are securely fitted, and that the line is there no matter what is displayed on the display (especially at the boot screen before Windows loads).
I have had the same problem with my 991sb and most recently my 930sb. The first was replaced at NEC's expense however on this second one i'm out of luck. I think its a problem with its power inverter. It may be repairable by a tv repair place. I'll be looking into it and let you guys know.