Chosen Solution
Hello everyone, I have an Alienware 15 R3 (i7-6700HQ & GTX 1070). Recently my laptop would overheat and its idle temp would be 92 C. I opened up the laptop repasted the GPU and CPU with arctic mx-4 and after the assembly the display wouldn’t work. The display works when booting with D + Power button and flashes all colors correctly. When connecting with an exterior monitor via HDMI the lcd display doesn’t show anything yet the external monitor works fine. The LCD display is not completely dim it emits some sort of light yet shows nothing. And unfortunately my idle temps even though it dropped to 80 is still too high i think for idle temps. I even undervolted the CPU and still the temps are that high. How can i diagnose the issue with the LCD (I speculate it’s either the LCD cable or the cable’s socket on the motherboard) ? Why are my idle temps this high and is this normal ?
Hi, Are both the fans working, you didn’t say? Did you try toggling the graphics between integrated and discrete by pressing Fn + F7 just to check? Also try operating Fn + F10 to increase the screen brightness. Just trying to eliminate remote possibilities. You say that the display emits some sort of light so try shining a torch at an angle close to the laptop screen and check for images when the laptop is on and there is a display on the external monitor. Try this in a darkened room because if there are any images, they will be very faint. If there are images is then there is a backlight problem. You would need to know the pinout for the video cable to know which pins the backlight feed is on. Mostly in laptops the backlight power is permanently supplied to the LCD panel and it is turned on and off in the panel by a signal from the motherboard on the BL_On wire in the video cable. If there are no images then as you say there most probably is a connection problem but it could be at either end, motherboard or LCD panel or perhaps the cable is damaged where it passes through the hinge to get to the panel from the motherboard
