From your description, the problem appears to be in the display assembly.
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The laptop works OK with an external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
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The laptop works OK with an external monitor and the laptop video cable disconnected from the display assembly only.
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It may be a problem with an open circuit wire in the video cable as the motherboard does communicate in a way with the display e.g. it signals to turn the screen backlights on and off as the power for the backlights is always provided to the display and it is turned on/off in the display and not at the motherboard.
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This proves that there is no problem with the motherboard or GPU as the laptop turns on and there is a display and that there are no short circuits between the wires in the laptop video cable which may be causing the problem as it is still connected to the motherboard.
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The motherboard schematic would be needed to see if there are any other wires that may be used for something else other than for the signals to display the picture. Try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard.
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You could always satisfy yourself that the video cable is OK by using an Ohmmeter and check that each wire in the video cable has continuity from end to end and if they are all OK then all that’s left is the display assembly itself.
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Perhaps you should use an Ohmmeter and check each wire in the video cable for continuity between each end and if they are all OK then all that’s left is the display assembly itself.
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This is just how I see it.
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Also try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard. This may also help.
From your description, the problem appears to be in the display assembly.
-
It works OK with an external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
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The laptop works OK with an external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
It may be a problem with an open circuit wire in the video cable as the motherboard does communicate in a way with the display e.g. it signals to turn the screen backlights on and off as the power for the backlights is always provided to the display and it is turned on/off in the display and not at the motherboard.
The motherboard schematic would be needed to see if there are any other wires that may be used for something else other than for the signals to display the picture. Try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard.
Perhaps you should use an Ohmmeter and check each wire in the video cable for continuity between each end and if they are all OK then all that’s left is the display assembly itself.
From your description, the problem appears to be in the display assembly.
It works OK with an external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
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It may be a problem with an open circuit wire in the video cable as the motherboard does communicate in a way with the display e.g. it signals to turn the screen backlights on and off as the power for the backlights is always provided to the display and it is turned on/off in the display and not at the motherboard. The motherboard schematic would be needed to see if there are any other wires that may be used for something else other than for the display. Try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard.
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It may be a problem with an open circuit wire in the video cable as the motherboard does communicate in a way with the display e.g. it signals to turn the screen backlights on and off as the power for the backlights is always provided to the display and it is turned on/off in the display and not at the motherboard.
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Perhaps you should use an Ohmmeter and check each wire in the video cable for continuity between each end and if that is OK then all that’s left is the display assembly itself.
+
The motherboard schematic would be needed to see if there are any other wires that may be used for something else other than for the signals to display the picture. Try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard.
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Perhaps you should use an Ohmmeter and check each wire in the video cable for continuity between each end and if they are all OK then all that’s left is the display assembly itself.
From your description, the problem appears to be in the display assembly.
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It works OK with and external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
+
It works OK with an external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
It may be a problem with an open circuit wire in the video cable as the motherboard does communicate in a way with the display e.g. it signals to turn the screen backlights on and off as the power for the backlights is always provided to the display and it is turned on/off in the display and not at the motherboard. The motherboard schematic would be needed to see if there are any other wires that may be used for something else other than for the display. Try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard.
Perhaps you should use an Ohmmeter and check each wire in the video cable for continuity between each end and if that is OK then all that’s left is the display assembly itself.
Hi @ardias ,
From your description, the problem appears to be in the display assembly.
It works OK with and external monitor and the laptop video cable disconnected from the display assembly only. This proves that there is no problem with the motherboard or GPU as it turns on and there is a display and that there are no short circuits between the wires in the video cable which may be causing the problem.
It may be a problem with an open circuit wire in the video cable as the motherboard does communicate in a way with the display e.g. it signals to turn the screen backlights on and off as the power for the backlights is always provided to the display and it is turned on/off in the display and not at the motherboard. The motherboard schematic would be needed to see if there are any other wires that may be used for something else other than for the display. Try searching online for ''(insert motherboard’s board number) schematic'' to hopefully find them. The board number is printed on the motherboard.
Perhaps you should use an Ohmmeter and check each wire in the video cable for continuity between each end and if that is OK then all that’s left is the display assembly itself.
This is just how I see it.