I show you how fix a Samsung Galaxy Z Fold 3 smartphone (same for Galaxy Z Fold 4) that has a black screen or blank display where the screen will not turn on even though you know the phone is on. If this worked for you plz LIKE and comment which step worked for you. And if no go even after 7 times then give a DISLIKE. We should see at least 50% Likes. Good Luck!

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Also I am not responsible should anything go wrong so do AT YOUR OWN RISK!