Why theres only Black Screen on my laptop
Only blackscreen or no display thats why I only use external monitor to use my laptop. I dont know whats the problem of my laptop monitor
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With the laptop turned on but showing no display, try shining a flashlight at an angle close to the laptop screen and check if you can see any images at all.
They will be very faint if they are there so trying this in a darkened room may help.
If you can see images then there's a backlight problem with the screen. This could be due to a faulty backlight power supply on the motherboard, a faulty or loose eDP cable/cable connection between the motherboard and the LCD panel (either end motherboard or LCD panel) or a faulty LCD panel.
Below is an image taken from p.41 (of 72 pdf) of the ASUS TUF Gaming FX505DD DT DU Rev 2.0 schematic showing where the backlight power supply connects to the eDP connector on the motherboard which may help to find out if there's power being sent to the LCD panel or not. (+AC_BAT_SYS pins 37-40)
There's always backlight power being supplied to the panel (when the laptop is on) but the backlights in the panel are turned on and off by a signal voltage turned on/off on the backlight enable lead on the eDP cable (LCD_BKEN_CONN pin 25)
(click on image)
If you can't see any images at all this could be due to a faulty or loose eDP cable/cable connection between the motherboard and the LCD panel (either end motherboard or LCD panel) or a faulty LCD panel.
If it is determined that the LCD panel is faulty here's a video that shows how to replace it.
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