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When it flickers, can you still see the text when the screen goes dark? May have to use a bright flashlight set right on the display to see the text on the screen beside where the light sits. That will tell you if it's the backlight.
You can also look at a grazing angle into one of the edges to see if the backlight is flickering when the display does. When it's cold, does it start with a slight pinkish color? That can be a sign of backlight going bad. Anything interesting happen when you flex the cable by moving the screen?
I'm not saying it's impossible, but I've never seen software cause consistent screen flicker. And if the vga port doesn't flicker, sw is even less likely the problem.
If you bet the odds, you'd bet on a bad display cable. Won't hurt to try replugging it.
If that doesn't help, then your monitor may be dying....
Dull or Dim Brake Light Repair: If your car has a dull or dim brake light it is dangerous to you and other drivers. A dim brake light is a mystery to most people because the bulb is working, just not correctly. First confirm a new and correct brake light bulb has been installed. Next, turn the ignition key to the "on" position and have a helper depress the brake pedal. With the bulb installed touch a grounded test light to the outer bulb holder ring. If the bulb brightness changes the bulb socket ground has high resistance and needs to be repaired or replaced.
Flickering Brake Light Bulb Repair: A flickering brake light bulb can be very distracting and annoying. A brake light flickers because the power or ground is being obstructed momentarily. The most common cause for this condition is a loose fitting bulb socket. To check for this condition remove the brake light bulb in question, while a helper hold their foot on the brake pedal move the bulb around slightly in the socket. If the bulb flickers replace or repair the bulb socket as needed to regain proper brake light bulb operation. If the brake light bulb socket tests ok wiggle the brake light fuse and wiring at the brake light bulb socket, brake light switch and turn signal switch (American cars). If the brake light bulb flickers repair the component or wiring as needed. Preferred Procedure: Always replace brake light bulbs with manufacturers recommend replacement bulbs. If you cannot find the correct replacement bulb part number consult an auto parts store for additional manufacturer information. Common Problems
When brake light bulbs are replaced with the incorrect bulb causing no or dim brake light operation If the brake lights stay on continuously it could mean the brake light switch has failed or an adjustment is needed.
You need to connect to vag com or some else computer program to see the error code and when remove prroblem you need to delet the error from car computer memory to get rid of the light. The most common problems are: blown fuse, bad connection under the seat or something like that! But you can't do nothing without the comp.
Dim and flicker problems are a sign of a back-light problem and it could be a faulty inverter board or a CCFL lamp. For service, parts and DIY info check out LCD parts - Click on this link to their WEB site :- www.lcdparts.net