This logic has no bearing with the display circuit, its function is part of the trackpad logic as its marked as such ***''5V TRACKPAD S4 FET''***
Let's backup here a bit. What does the internal display show if anything? Image or even a glow?
What happens when you shine a flashlight through the Apple logo in the lid do you see the faint image of your desktop and its icons?
=== Update (07/10/2022) ===
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@Kosik - Do you see any physical damage to the lid or display screen? If you don't see any damage, it's possible you have a cable connection issue or a bad cable if you don't see even a faint image on the display you may want to double check the image will be very faint! As its rare to loose both the video signal and the backlight power to the display. More often I see the backlight power fail.
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@Kosik - Do you see any physical damage to the lid or display screen? If you don't see any damage, it's possible you have a cable connection issue or a bad cable.
+
+
If you don't see even a faint image on the display you may want to double check the image will be very faint with the flashlight test! As its rare to loose both the video signal and the backlight power to the display. More often I see the backlight power fail.
I would follow this guide to step 9 [guide|13554] now with power disconnected jump down to Step 14 to disconnect the LVDS cable. Now using a camera take a picture like this one
[image|2694581]
So I can see both connectors pins (in focus) and post it here [guide|21499]
This logic has no bearing with the display circuit, its function is part of the trackpad logic as its marked as such ***''5V TRACKPAD S4 FET''***
Let's backup here a bit. What does the internal display show if anything? Image or even a glow?
What happens when you shine a flashlight through the Apple logo in the lid do you see the faint image of your desktop and its icons?
+
+
=== Update (07/10/2022) ===
+
@Kosik - Do you see any physical damage to the lid or display screen? If you don't see any damage, it's possible you have a cable connection issue or a bad cable if you don't see even a faint image on the display you may want to double check the image will be very faint! As its rare to loose both the video signal and the backlight power to the display. More often I see the backlight power fail.
+
+
I would follow this guide to step 9 [guide|13554] now with power disconnected jump down to Step 14 to disconnect the LVDS cable. Now using a camera take a picture like this one
+
+
[image|2694581]
+
+
So I can see both connectors pins (in focus) and post it here [guide|21499]
This logic has no bearing with the display circuit, its function is part of the trackpad logic as its marked as such ***''5V TRACKPAD S4 FET''***
Let's backup here a bit. What does the internal display show if anything? Image or even a glow?
What happens when you shine a flashlight through the Apple logo in the lid do you see the faint image of your desktop and its icons?