A laptop LCD screen may malfunction when either one of its two constituent electronic components go bad. Most often, the problem can be rectified by repairing or replacing the backlight or the inverter. To check whether the problem lies with the screen, connect the laptop to an external display system, such as a desktop monitor. If the external monitor works fine, then it means the laptop's screen is broken and needs to be repaired.
Switch off the laptop and unplug its power cord from the AC mains supply. Turn the computer over and remove the battery casing to dislodge the battery from its chamber.
Locate screws along the bezel (plastic frame bordering the LCD panel) and remove them. There may be rubber seals over the screws that you will have to pry loose to access the screws underneath. Some laptops may also have screws to the side of the LCD panel. Remove all before proceeding.
Gently pull the frame away from the screen. Place a finger between the plastic frame and the LCD screen and work your way along the perimeter to loosen latches. Release all locks to free the LCD panel from the laptop's casing. To prevent damage, avoid using a sharp object near an LCD screen.
Unplug the video cable and the power cable from the back of the TX36D72VC1FAB screen , and take the unit out of the laptop. Locate and check a small green board attached to the bottom of the screen--this is the inverter panel. If connections on either end are loose, attach them firmly and check for display. If the screen is still blank, take the component out and test on a working LCD monitor. If the working monitor does not display images after installing the inverter, it means the problem lies with the inverter and that it needs to be replaced.
If you install a new inverter and still receive no images, you will have to fix backlight problems as well. Locate a long, thin fluorescent tube on the side of the LCD panel and dismount it from the display assembly. Remove rubber tabs from both leads (ends) and check for loose connections. If loose, solder them on firmly. If the screen still does not work, replace the tube with a new one. At this point, you have tested both the inverter and the tube by checking for loose connections, and replaced both components.
Reassemble the laptop by mounting the B140XW01 V.3 panel in the laptop frame and putting all screws back on. Turn on the laptop. It should now be displaying images with full brightness.
If you have to replace LCD parts, refer to the label on the component for its manufacturer reference number. You can use the spare number to order parts directly from the manufacturer or from another source. Never attempt to install a component without first checking compatibility with your laptop, as it can seriously damage the computer. Never use generic spares, for better performance and durability.
If you have any leftover parts such as cables and screws after reassembling the laptop, it means you have not done it properly. A poorly assembled electronic component is dangerous and you should rectify the problem immediately.