@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
=== Update 10/01/2024 ===
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
[image|3436428]
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
=== Update 10/24/2024 ===
@lloydkwakye we need you to measure the voltage on Pin 38, 39, and 40 to see what voltage you get. I've marke d pin 40 on the previous image. 39 and 38 are just adjacent to it. The expectation here is somewhere between 30 and 40VDC. If you only get the same voltage as your system voltage you know the boost circuit is the issue. For that you need to check the components which are located on the other side but are covered by the fan cable.
[image|3457228]
If the voltage is to high then the issue are the LED backlights and if the voltage is 0 then the issue is the power circuit having failed. Let us know what you find out.
=== Update 10/27/2024 ===
@lloydkwakye nothing is ever easy is it. Amazingly enough the components that are in the schematic part of the LED-VCC circuit seem to have never been populated on your board. We may just have a different revision here. I did notice an oddity. Check the hole (yellow arrow) and see if that is normal for the board or if something has happened on the other side. Have you have a chance of measuring the voltage on your display connector yet.
[image|3459543]
=== Update 01/16/2025 ===
@lloydkwakye this looks wrong. There is a possibility that you have a lost component and bad solder pads. The area that looks odd (red arrow) should have an inductor for the BK_EN circuit. Post a clear picture of that area. If it is missing, then your backlight will not turn on since it does not get the enable signal.
[image|3531237]
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+
=== Update 01/18/2025 ===
-
@lloydkwakye [image|3532193]if this would have been a non-populated part then I would expect it to look like the rest of those areas (red arrows). I would measure the voltage on the solder pad (blue arrow) and see if there is any voltage that corresponds to what BK_EN needs. IF it does then apply a jumper from the point the BK_EN on the display adapter.
+
@lloydkwakye
+
+
[image|3532193]
+
+
+
+
if this would have been a non-populated part then I would expect it to look like the rest of those areas (red arrows). I would measure the voltage on the solder pad (blue arrow) and see if there is any voltage that corresponds to what BK_EN needs. IF it does then apply a jumper from the point the BK_EN on the display adapter.
+
+
=== Update 01/21/2025 ===
+
@lloydkwakye [image|3534414]
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+
now measure these voltages. If those are okay,we can simply run a jumper from the resistor to pin 36. Do not do this without checking the voltage first.
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
=== Update 10/01/2024 ===
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
[image|3436428]
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
=== Update 10/24/2024 ===
@lloydkwakye we need you to measure the voltage on Pin 38, 39, and 40 to see what voltage you get. I've marke d pin 40 on the previous image. 39 and 38 are just adjacent to it. The expectation here is somewhere between 30 and 40VDC. If you only get the same voltage as your system voltage you know the boost circuit is the issue. For that you need to check the components which are located on the other side but are covered by the fan cable.
[image|3457228]
If the voltage is to high then the issue are the LED backlights and if the voltage is 0 then the issue is the power circuit having failed. Let us know what you find out.
=== Update 10/27/2024 ===
@lloydkwakye nothing is ever easy is it. Amazingly enough the components that are in the schematic part of the LED-VCC circuit seem to have never been populated on your board. We may just have a different revision here. I did notice an oddity. Check the hole (yellow arrow) and see if that is normal for the board or if something has happened on the other side. Have you have a chance of measuring the voltage on your display connector yet.
[image|3459543]
+
+
=== Update 01/16/2025 ===
@lloydkwakye this looks wrong. There is a possibility that you have a lost component and bad solder pads. The area that looks odd (red arrow) should have an inductor for the BK_EN circuit. Post a clear picture of that area. If it is missing, then your backlight will not turn on since it does not get the enable signal.
[image|3531237]
+
+
=== Update 01/18/2025 ===
+
@lloydkwakye [image|3532193]if this would have been a non-populated part then I would expect it to look like the rest of those areas (red arrows). I would measure the voltage on the solder pad (blue arrow) and see if there is any voltage that corresponds to what BK_EN needs. IF it does then apply a jumper from the point the BK_EN on the display adapter.
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
=== Update 10/01/2024 ===
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
[image|3436428]
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
=== Update 10/24/2024 ===
@lloydkwakye we need you to measure the voltage on Pin 38, 39, and 40 to see what voltage you get. I've marke d pin 40 on the previous image. 39 and 38 are just adjacent to it. The expectation here is somewhere between 30 and 40VDC. If you only get the same voltage as your system voltage you know the boost circuit is the issue. For that you need to check the components which are located on the other side but are covered by the fan cable.
[image|3457228]
If the voltage is to high then the issue are the LED backlights and if the voltage is 0 then the issue is the power circuit having failed. Let us know what you find out.
=== Update 10/27/2024 ===
-
@lloydkwakye nothing is ever easy is it. Amazingly enough the components that are in the schematic part of the LED-VCC circuit seem to have never been populated on your board. We may just have a different revision here. I did notice an oddity. Check the hole (yellow arrow) and see if that is normal for the board or if something has happened on the other side. Have you have a chance of measuring the voltage on your display connector yet.[image|3459543]
+
@lloydkwakye nothing is ever easy is it. Amazingly enough the components that are in the schematic part of the LED-VCC circuit seem to have never been populated on your board. We may just have a different revision here. I did notice an oddity. Check the hole (yellow arrow) and see if that is normal for the board or if something has happened on the other side. Have you have a chance of measuring the voltage on your display connector yet.
+
+
[image|3459543]
+
+
=== Update 01/16/2025 ===
+
@lloydkwakye this looks wrong. There is a possibility that you have a lost component and bad solder pads. The area that looks odd (red arrow) should have an inductor for the BK_EN circuit. Post a clear picture of that area. If it is missing, then your backlight will not turn on since it does not get the enable signal.
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
=== Update 10/01/2024 ===
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
[image|3436428]
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
=== Update 10/24/2024 ===
-
@lloydkwakye we need you to measure the voltage on Pin 38, 39, and 40 to see what voltage you get. I've marke d pin 40 on the previous image. 39 and 38 are just adjacent to it. The expectation here is somewhere between 30 and 40VDC. If you only get the same voltage as your system voltage you know the boost circuit is the issue. For that you need to check the components which are located on the other side but are covered by the fan cable. [image|3457228]
+
@lloydkwakye we need you to measure the voltage on Pin 38, 39, and 40 to see what voltage you get. I've marke d pin 40 on the previous image. 39 and 38 are just adjacent to it. The expectation here is somewhere between 30 and 40VDC. If you only get the same voltage as your system voltage you know the boost circuit is the issue. For that you need to check the components which are located on the other side but are covered by the fan cable.
+
+
[image|3457228]
+
+
If the voltage is to high then the issue are the LED backlights and if the voltage is 0 then the issue is the power circuit having failed. Let us know what you find out.
+
+
=== Update 10/27/2024 ===
+
@lloydkwakye nothing is ever easy is it. Amazingly enough the components that are in the schematic part of the LED-VCC circuit seem to have never been populated on your board. We may just have a different revision here. I did notice an oddity. Check the hole (yellow arrow) and see if that is normal for the board or if something has happened on the other side. Have you have a chance of measuring the voltage on your display connector yet.[image|3459543]
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
=== Update 10/01/2024 ===
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
[image|3436428]
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
+
+
=== Update 10/24/2024 ===
+
@lloydkwakye we need you to measure the voltage on Pin 38, 39, and 40 to see what voltage you get. I've marke d pin 40 on the previous image. 39 and 38 are just adjacent to it. The expectation here is somewhere between 30 and 40VDC. If you only get the same voltage as your system voltage you know the boost circuit is the issue. For that you need to check the components which are located on the other side but are covered by the fan cable. [image|3457228]
+
+
If the voltage is to high then the issue are the LED backlights and if the voltage is 0 then the issue is the power circuit having failed. Let us know what you find out.
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
=== Update 10/01/2024 ===
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
[image|3436428]
+
+
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]
+
+
=== Update 10/01/2024 ===
+
@lloydkwakye thank you for the images. We need to get one more. This one closer to the connector for your display. It'll be marked as J4501. You can check your voltages on that one.
+
+
[image|3436428]
+
+
Pin 40, 39 and 38 are the positive voltages for your LED's. Let us know what voltages your multimeter measures. Remember that those contacts are small. Use a magnifying sources and some needle tips for your meter. You ***don't*** want to shorten out those pins.
+
+
Pin 36 is Backlight enable and pin 35 is your LCD backlight power modulator (brightness of the backlight) again we need to voltages on that. You do need to make all measurements with the computer turned on. Again, ***do not*** shorten out the contacts with your probes.
@lloydkwakye first you need to determine if it is the backlight that is not working. Try this. turn the computer on. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.
Next, connect an external monitor and make sure that this monitor displays everything properly. Now you have it narrowed down. From here on you will have to open your computer up. Next you check the display adapter. You need to check the voltages for your backlight on this connector. It could be as simple as a blown fuse, to as complex as a failed WLED driver etc.
To help you further, we would need the exact model of your motherboard and we would need to see your motherboard. That way we can check for components that may have failed etc.
Post some good pictures of your motherboard with your Question. [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true]