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Sony's flagship tablet, released in June 2015.

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LCD backlight not working after screen change

Hello Guys,

I have a Sony Xperia Z4 Tablet, Model: SGP771. After changing a cracked screen, with a brand new original Sony screen, the screen work but it doesn't light up. I mean it shows information and the touch sensor works, but the LCD light is not working.

I tried two different screens, and i get the same problem.

Any idea or suggestion with it?

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Did you disconnect the battery before removing any screen connectors?

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yes of course

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Did the old screen worm before you did this repair? Also is there any missing components or damage near the screen connectors.

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the old screen worked, the lcd light worked, but after changing it, even the old screen is not lighting up anymore. the connectors and pins look ok, and the cable as well is transmiting since i checked.

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Was this ever solve?. I am now having the same issue.

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Hey all i got the same Problem and i tried a new flat cable it also the same did u got any idea?

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What IF I didnt disconnect The battery?

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I realize this answer might be a bit late but just wanted to give my solution to the problem. So after searching the web everywher for answers i found out that the problem was probably a blown backlight fuse, but i had no idea if it was supposed to be on the motherboard or on the screen. So i tried searching everywhere on the internet for a picture of the fuse with no luck so i just gave up. Luckily though after a while i went here to see if there was any new answers and I saw that one guy mentioned it was near the screen connection. Now ive finnaly found it i just put a drop of solder on it with my solder Pen so that the two ends gets connected and it actually worked. The best way though is probably to get someone with solder experience to change the fuse because i can imagine that youll easily break something else if you mess upp. Anyway here is the picture of the fuse located on the MOTHERBOARD right above the screen connector. As you can see its really small and is marked with a “v” thats barely visible with your eye:

Block Image

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any idea where you’d find a fuse like that or what size?

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I have the same problem, it is because I powered on the tablet without the lcd screen (yes, I didn't disconnect the battery). The result is the booster component is burned. That's why the touch sensor works but the lcd backlight is dark.

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Ok, this was talking about a fuse blowing, which I think is true of mine being that the component that Tony pointed out is open, but I also don’t want to just short it and have a different component for the backlight go, any ideas which components are on the backlight?

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Erlis Shahu 가/이 대단히 고마워 할 것입니다.
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