What is the motherboard "board number" in your T440s, e.g. T440s ST-1 UMA?
All the info that I can find indicates that a T440s has a 40 pin eDP cable between the motherboard and the motherboard.
On the original screen could you still detect any display when shining a torch at an angle close to the screen indicating that it may be a backlight problem only.
If not or you didn't try, try it now on the new display and check if there is a "display" present when the laptop is on. It will be very faint if it is there so trying this in a darkened room may help.
If there is a display present then you have a backlight problem.
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Assuming that the new display is OK then you may have damaged the backlight power supply when you forced the cable into the connector.
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You may have damaged the backlight power supply when you forced the cable into the connector.
Normally power is available for the backlights all the time at the LCD panel and a signal is sent to the panel to either turn it on or turn it off. It is not turned on or off, on the motherboard.
If you have a voltmeter, check the voltage on the eDP pins.
Here's a link to the [https://forum.laboneinside.com/viewtopic.php?t=2264|schematic] (go to p.38) which shows where to test.
This may not be the correct circuit as it doesn't match what you're saying but perhaps it may give you some clues.
What is the motherboard "board number" in your T440s, e.g. T440s ST-1 UMA?
All the info that I can find indicates that a T440s has a 40 pin eDP cable between the motherboard and the motherboard.
On the original screen could you still detect any display when shining a torch at an angle close to the screen indicating that it may be a backlight problem only.
-
If not or you didn't try, try it now and check if there is a "display" present when the laptop is on. It will be very faint if it is there so trying this in a darkened room may help.
+
If not or you didn't try, try it now on the new display and check if there is a "display" present when the laptop is on. It will be very faint if it is there so trying this in a darkened room may help.
If there is a display present then you have a backlight problem.
Assuming that the new display is OK then you may have damaged the backlight power supply when you forced the cable into the connector.
Normally power is available for the backlights all the time at the LCD panel and a signal is sent to the panel to either turn it on or turn it off. It is not turned on or off, on the motherboard.
If you have a voltmeter, check the voltage on the eDP pins.
Here's a link to the [https://forum.laboneinside.com/viewtopic.php?t=2264|schematic] (go to p.38) which shows where to test.
This may not be the correct circuit as it doesn't match what you're saying but perhaps it may give you some clues.
Hi,
What is the motherboard "board number" in your T440s, e.g. T440s ST-1 UMA?
All the info that I can find indicates that a T440s has a 40 pin eDP cable between the motherboard and the motherboard.
On the original screen could you still detect any display when shining a torch at an angle close to the screen indicating that it may be a backlight problem only.
If not or you didn't try, try it now and check if there is a "display" present when the laptop is on. It will be very faint if it is there so trying this in a darkened room may help.
If there is a display present then you have a backlight problem.
Assuming that the new display is OK then you may have damaged the backlight power supply when you forced the cable into the connector.
Normally power is available for the backlights all the time at the LCD panel and a signal is sent to the panel to either turn it on or turn it off. It is not turned on or off, on the motherboard.
If you have a voltmeter, check the voltage on the eDP pins.
Here's a link to the [https://forum.laboneinside.com/viewtopic.php?t=2264|schematic] (go to p.38) which shows where to test.
This may not be the correct circuit as it doesn't match what you're saying but perhaps it may give you some clues.
Hopefully a start.