Why is the backlight on my computer screen not working?
Looking at the screen at an extreme angle or with direct light onto the display can often show up a very faint image of the operating system. Basically at this point we can conclude that the screen is getting a video signal, but it is not receiving power for the LED backlights.
Where is the LED backlight on my laptop?
The LED backlight is powered by the motherboard which is the main logic board (or brain) of the computer; and sits under the keyboard (usually). The signal cable for the screen (the flat grey cable you connect to the back of the screen known as an LVDS or EDP cable), runs down under the keyboard and also connects to the laptop’s motherboard.
Can a damaged LCD screen still light up?
There are professional ways to test an LCD screen, such as with an LCD tester; however in this case we can perform a simple test without any expensive equipment. Refit the old screen, even if it is damaged it should still light up as it did before. If your old screen does not light up now you need to read on:
Why does my computer screen not light up?
The wider end connects to the screen (supplies data signal) and another one to the inverter board (supplies power for inverter). If your new screen lights up but has no image make sure the video cable plugged correctly. It’s possible that during the reassembly process you accidentally pulled the cable from the connector.
What should I do if my new laptop screen is not working?
Double check the compatibility between the original and new LCDs. Troubleshooting LCDs with CCFL (backlight lamp) The old style screens have a backlight lamp inside and require an inverter board which is usually mounted on the lower part of the display assembly, as you can see on the following picture.
Where is the backlight lamp on a laptop?
Troubleshooting LCDs with CCFL (backlight lamp) The old style screens have a backlight lamp inside and require an inverter board which is usually mounted on the lower part of the display assembly, as you can see on the following picture. On the following picture you can see how the screen connected to the laptop.
Why is the led on my iMac not turning on?
The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power source is disconnected or the power supply is faulty. Indicates that the main logic board has detected proper power from the power supply when • the computer is turned on.