Display backlight not working
Two Flexi cables was replaced. Not helped
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Was the battery disconnected from the motherboard when the EDP (video) cables were being replaced?
Check if there's voltage on pin 1-3 of the EDP cable connector on the motherboard.
If there's no voltage check if motherboard fuse # FG3301 (3A_32V_ERBRD3R00X) is OK and not blown.
Here is a composite image showing the backlight power supply circuit that may help.
(click on image)
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