It seems like it is either a backlight power supply problem or more likely at faulty video cable connection, a damaged video cable where it passes through the hinge to get to the LCD unit or a faulty LCD display unit.
+
Create a [https://www.windowscentral.com/generate-battery-report-windows-10|Win 10 battery report] to check the status of the battery. Compare ''design capacity'' versus ''full charge capacity'' to see if it is OK. It may be that the screen is dimming due to the power management in the laptop trying to maintain the system operating with reduced power due to the battery not managing whereas with the external source it is OK
+
+
If the battery appears to be OK then it seems like it is either a backlight power supply problem or more likely at faulty video cable connection, a damaged video cable where it passes through the hinge to get to the LCD unit or a faulty LCD display unit.
Here’s the [link|https://dl.dell.com/topicspdf/alienware-15-r4_service-manual_en-us.pdf|service manual] for the laptop. Go to p.69 to view the necessary pre-requisite steps and then the procedure to remove the display unit.
This will allow you to inspect the video cable connection for starters and if it appears to be OK then after that you may have to remove the display panel so that you can check the video cable connection at the panel (I’m not sure if it is the plug in type or whether it may be hard wired into the panel).
-
Once you have accessed the panel on the back, usually there is the make and model number of the panel itself. Search online for ''(insert make and model number) datasheet.'' If you find it then this gives the pinout of the wires in the video cable which will allow you to check if the backlight power supply voltage which is also fed through the same cable is stable or varying ''at the motherboard video cable connector.''
+
Once you have accessed the panel on the back, usually there is the make and model number of the panel itself. Search online for ''(insert make and model number) datasheet.'' If you find it then this gives the pinout of the wires in the video cable which will allow you to check if the backlight power supply voltage which is also fed through the same cable is stable or varying ''at the motherboard video cable connector.''
With most laptops there are 3 backlight power wires and 3 earth return wires for the backlights. This doesn’t mean that there are 3 separate power supplies. It is the one supply spread over 3 wires because of the amount of current that each wire has to carry. One wire is not big enough to carry it all alone as they are only thin wires.
It may turn out that it is a faulty display panel in which case it will have to be replaced as it cannot be repaired.
It seems like it is either a backlight power supply problem or more likely at faulty video cable connection, a damaged video cable where it passes through the hinge to get to the LCD unit or a faulty LCD display unit.
-
Here’s the [https://dl.dell.com/topicspdf/alienware-15-r4_service-manual_en-us.pdf|service manual] for the laptop. Go to p.69 to view the necessary pre-requisite steps and then the procedure to remove the display unit.
+
Here’s the [link|https://dl.dell.com/topicspdf/alienware-15-r4_service-manual_en-us.pdf|service manual] for the laptop. Go to p.69 to view the necessary pre-requisite steps and then the procedure to remove the display unit.
This will allow you to inspect the video cable connection for starters and if it appears to be OK then after that you may have to remove the display panel so that you can check the video cable connection at the panel (I’m not sure if it is the plug in type or whether it may be hard wired into the panel).
-
Once you have accessed the panel on the back, usually there is the make and model number of the panel itself. Search online for ''(insert make and model number) datasheet.'' If you find it then this gives the pinout of the wires in the video cable which will allow you to check if the backlight power supply voltage which is also fed through the same cable is stable or varying ''at the motherboard video cable connector.'' With most laptops there are 3 backlight power wires and 3 earth return wires for the backlights. This doesn’t mean that there are 3 separate power supplies. It is the one supply spread over 3 wires because of the current that each wire has to carry. One wire is not big enough to carry it all alone as they are only thin wires.
+
Once you have accessed the panel on the back, usually there is the make and model number of the panel itself. Search online for ''(insert make and model number) datasheet.'' If you find it then this gives the pinout of the wires in the video cable which will allow you to check if the backlight power supply voltage which is also fed through the same cable is stable or varying ''at the motherboard video cable connector.''
+
+
With most laptops there are 3 backlight power wires and 3 earth return wires for the backlights. This doesn’t mean that there are 3 separate power supplies. It is the one supply spread over 3 wires because of the amount of current that each wire has to carry. One wire is not big enough to carry it all alone as they are only thin wires.
It may turn out that it is a faulty display panel in which case it will have to be replaced as it cannot be repaired.
Hi,
It seems like it is either a backlight power supply problem or more likely at faulty video cable connection, a damaged video cable where it passes through the hinge to get to the LCD unit or a faulty LCD display unit.
Here’s the [https://dl.dell.com/topicspdf/alienware-15-r4_service-manual_en-us.pdf|service manual] for the laptop. Go to p.69 to view the necessary pre-requisite steps and then the procedure to remove the display unit.
This will allow you to inspect the video cable connection for starters and if it appears to be OK then after that you may have to remove the display panel so that you can check the video cable connection at the panel (I’m not sure if it is the plug in type or whether it may be hard wired into the panel).
Once you have accessed the panel on the back, usually there is the make and model number of the panel itself. Search online for ''(insert make and model number) datasheet.'' If you find it then this gives the pinout of the wires in the video cable which will allow you to check if the backlight power supply voltage which is also fed through the same cable is stable or varying ''at the motherboard video cable connector.'' With most laptops there are 3 backlight power wires and 3 earth return wires for the backlights. This doesn’t mean that there are 3 separate power supplies. It is the one supply spread over 3 wires because of the current that each wire has to carry. One wire is not big enough to carry it all alone as they are only thin wires.
It may turn out that it is a faulty display panel in which case it will have to be replaced as it cannot be repaired.