This may not be your problem but I have found that in some LCD screens the pixels can "stick" and remain black even if they're not activated. Try GENTLY snapping the black spots with your finger to see if they will free up. Sometimes yes, sometimes no. Good luck.
SOURCE: toshiba regza lcd 46x3500
This is what is known as a dead pixel. If you have a standard wide screen lcd monitor it has over 1 million pixels. It is not super un-common for one to go bad. It will either always be dark or in your case always be lit. It is not worth it to repair, and in most cases unless you have multiple dead pixels with in a square inch of screen, it is not covered under warranty either.
Each pixel is individual and the problem will most likely not spread.
SOURCE: red static in black background ~ thin line running down center
Robjrpena,
Did you find a solution to your "red dot" problem? I'm having the same issue :(
Thanks John
SOURCE: my canon sd10 digital camera lcd balnk/black bu
Had the same problem with my SD10. The switch in the AV port sometimes gets dirty or corroded, and tricks the camera into thinking that an AV plug is inserted. This will turn off the screen.
To fix it, repeatedly insert and remove an AV cable into the port several times. This may help break off any corrosion or dirt that may be holding this switch open.
SOURCE: I have an Icom VHF that was hooked up reverse polarity on 12v.
They likely replaced just about every diode and possibly the main circuit board. The tech should be willing to tell you exactly what work was done, and many return the replaced parts.
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