Chosen Solution
I need to test the LCD in my dell M6300. It’s solid black, no flickers, nothing. I have replaced the motherboard (this fix lasted 6 weeks), the GPU, the CPU, and the motherboard a 2nd time. These last attempts did nothing. When I power ON, I hear the optical drive as it boots up and I am able to feel the HD as it starts spinning, but the LCD remains pitch black.
jpviewer1 start off by checking to see if this works for your model: “Laptop LCD Built-In Self Test To run the Built-In Self-Test perform the following: Method 1 Turn the computer off. Press and hold the D key while pressing the power button. This will start the Laptop LCD BIST. The screen will display multiple flashing colors. Look for lines, distortion, or any other video issues you have observed. The laptop will restart when the test is finished. Method 2 Turn the computer off. Press and hold the Fn key and power on your laptop while holding down the Fn key. This will start the Dell Pre-Boot System Assessment. Your computer will now run a series of tests. When your computer displays a series of horizontal and vertical color bars, it will prompt you with a pop-up message “Do you see the color bars? Yes / No Press the N key to enter the Laptop LCD BIST. Note: If you do not respond for 30 seconds, the diagnostics will automatically assume your response as a ‘No’ and proceed to the Laptop LCD Built-In Self Test. The screen will display multiple flashing colors. Look for lines, distortion, or any other video issues you have observed. The laptop will restart when the test is finished.” With all the items you already replaced, I would go and check the inverter. your M6300 uses a CCFL backlight so this could be caused by a bad inverter. Take a flashlight and angle it against the LCD see if you can make out some images. If so, replace the inverter.
