My L1930B display darkens right after switching it on. The image of the computer appears only for a millisec. If I keep trying switching on and off, it begins working, but usually it doesn't. What could be the problem? Regards, Attila

Failing Inverter An inverter, typically found inside a laptop computer, consists of a small board, which has impregnated electronic circuits stamped on it. Inverters look like thin boards about the of two sticks of chewing gum. The inverter and its bulb control the intensity of the liquid crystal display, which lights the screen monitor. The computer can control the output voltage of the inverter and either lighten or darken the screen. A special type of inverter can adjust the brightness of the screen by using an internal sensor to judge the room brightness, and then adjust the screen accordingly. Failing inverters give off some specific warning signs, which can be recognized by observing different screen characteristics.

Short Intermittent Display Upon turning on the laptop, the screen flashes on in the normal mode for a short period and then blinks to black. A very faint image appears in a dark background, which will be very hard to see almost invisible. After shutting off the laptop and restarting, the same mode occurs, where the screen appears normal for a few seconds then fades to black. This condition points to a failed inverter. To confirm this, plug in an operational external monitor; if the external monitor functions, the inverter has failed. b> Total Blackout with Ghost image b> The laptop turns on, as indicated by the power supply button, but the screen comes up black. The screen comes up black after restart. You might be able to detect a very dim or ghost-like image on the monitor. When you plug in a known functioning external monitor, the external monitor operates normally. This mode of display indicates a failed inverter. b> Long Term Periodic Operation b> With this failure mode, the laptop screen illuminates normally upon start-up and remains that way after several minutes, hours or even days, until it goes very dark again. Brightness controls or restoration attempts do not work. Most often, the screen will function normally with a computer restart, but will eventually return to black. Faint ghost images might appear, as seen in the total blackout mode. b> Dark With Color Variation b> Upon computer start-up, the monitor shows black or dark gray, accompanied by very faint images. The screen might have an intermittent color change, or remain on with a non-standard color variation, like pink or red. b> Auto Control Switch b> If the screen appears black, with no faint or ghost images, look for the lid switch near the back hinge. The switch, when depressed with a closed lid, shuts off the computer and monitor functions. Sometimes the switch becomes stuck in the closed position, disallowing the computer and monitor to turn on when opened. Pushing the switch manually several times can often free it up. If the switch tab has broken or jammed inside the case, it needs replacing. b> Loose Connection In this mode, the display looks normal upon start-up, but tapping the side case of the computer turns the screen black. More tapping results in the screen functioning normally then cutting out again. This condition points to a loose wire connection from the inverter to the LCD backlight lamp, or the video cable. The connectors can be accessed by removing the monitor bezel screws and pulling the plastic retainer off. Both connectors can be cleaned and refitted.

You will need to adjust the contrast and brightness down to about 50%.

Although your Toshiba portable computer appears to be on and running, there is no image on the built-in LCD display screen Look closely at the LCD display screen. If you can see a faint image on the screen, the display screen's fluorescent backlight may be turned off. Shining a flashlight directly at the screen will make it much easier to see whether or not there is a screen image actually present, though not lit up. On most Toshiba portable computers, there is a small plastic or metal pin near one of the LCD display lid hinges. When the display lid is shut (closed), this pin is pressed against an internal switch which turns off the backlight, saving battery power. You may be able to turn the backlight on again by tapping this pin repeatedly. The normal screen image will then suddenly appear, or re-appear.If there appears to be no display image at all, the problem is probably not related to the backlight. In this case, press and hold the Fn key and then press the F5 key several times, pausing several seconds between each keypress. This will cycle through several display output modes: Internal, External, Simultaneous, and possibly one or two more.If no image appears on the LCD display after cycling through the Fn-F5 sequence, try doing so with an external CRT monitor attached, if possible. If you still see no image, on either screen, try restarting the computer with the CRT monitor connected.If you see a screen image that looks normal when the computer is first powered on, or when you try to enter the BIOS Setup during the power-on sequence, it's an indication of a software problem (a driver or an application that's launched while the computer is loading Windows, possibly). Try downloading the display drivers for the computer from the Toshiba Support website, and then re-installing them.If the LCD screen or an external CRT monitor is blank only while the computer is first powered-on, but then works fine, it's probably not an indication of a problem. Some models display no text or images during the startup process. Additionally, installing some Windows Updates may delay the appearance of the familiar Windows desktop.If there are blank margins bordering the image on the LCD screen, launch the Windows Control Panel, then double-click the Display icon. Click the Settings tab, and then adjust the Screen Resolution setting until image fills the entire LCD screen, which will cause the margins to disappear.If the font size on an external CRT monitor seems too small for comfortable viewing, try clicking the Advanced button on the Settings page, and then adjust the DPI (dots per inch) value. Try 120DPI and 135DIP, to begin with. Avoid changing the DPI to much greater values, in order to avoid settings that will be difficult to change.

1. Hold down the power button for approximately 10 seconds until the computer turns off.
   
   
2. Verify that neither one of these keys are stuck in the down position:
   
   the Tab key (arrows pointing left and right)
   
   the tilde key ( ~ and ` characters)
   
   
3. Turn the computer on.
   
   
4. If either of the keys above appears to be stuck in the down position, and if the issue is not corrected by pressing these keys repeatedly, then service is required.

Can you see any image in a darkened room - best to try right at start up when the logo appears. If you see a faint image it means your back light or inverter is out. OR it may be that the lid closed sensor switch is jammed which is telling the laptop to turn off the backlight. Look near bottom of the screen for a small bump sticking out - this will correspond to a switch on the laptop base. Make sure the switch moves up and down. Some switches are on the hinge itself.
JC

Try seeing a faint image in a darkened room - easiest right when you turn it on and the logo is appearing. If you see faint image it is possibly the backlight inverter. I have also seen one of these models where the lid switch was jammed. It is at the back right side and when the screen is closed it tells the laptop to go into standby which really just turns off the backlight. There should be a little stub sticking out or you may need to use tweezers to gently lift it back up. JC

sounds like the pixel controllers have gone bad or one or more of the color (RGB, RED, GREEN, BLUE) controllers have gone out. this is quite common in lcd monitors/tvs and is usually caused by pressure on the edges of the screen (you grabbed it too tightly when moving the monitor) or just faulty controllers. they are expected to eventually go bad, ask LG for yourself, they will tell you the same thing. If you just bought it, that can be considered a mfr defect that they will replace, IF IT IS IN WARRANTY!!!!! Unfort. there is no fix due to seal that placed on the actual lcd panel inside the plastic casing. Youd spend more money trying to find the part and install it than just buying a new monitor. hate to say it but im an avid gamer and have gone through about 4 lcd monitors in tha past 3 years due to everyday use

try going to the setup screen button left of adjustments







try going to the set up menu on the left of the buttons come down to the slider control just above the information icon then go across to color reset hope this helps regards Jim

1 lool
change lcd panel ok

When an LCD Monitor starts to respond like this it is due to one of three reasons a power supply is not generating enough power to properly power the LCD or the LCD's backlight is beginning to burnout, and last the inverter is bad. These things all can be replaced, but it is not worth the cost! Easier and cheaper to buy a new one!

either the fly-eye lens or the light polarizer is fried due to excessive dust and heat. bad news: you'll have to replace the entire optical engine. worse news: infocus doesn't make them anymore. sorry.