iFixit - Answers With Device "Sony Xperia Z4 Tablet"

sony xperia z4 tablet: LCD backlight not working after screen change

Fri, 17 Jan 2025 10:43:05 -0700

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?

⟐ Commented January 17, 2025 at 10:43 MST

Sony Xperia Z4 Tablet: How to separate the screen from the frame?

Wed, 06 May 2020 22:27:08 -0700

Hello I've bought a Z4 tablet from a friend but after using it for a while one part of the screen starts to flicker. Its like its duplicating other parts of the screen into this rectangle wich covers like 1/4 in the lower left. If i turn it off and leave it for a while it dissappears but when I've then used it for a while again it comes back. The longer i use it the more intense the flickering/flashing becomes. My first thought was that it was software related but I've tried repairing it through xperia companion without succes. I'm now starting to believe its a hardware issue. Im thinking it might be the flex cable that gets some kind of a reaction when the tablet gets warmer. I'm considering to try to open it and replace the flex cable but after searching on the internet it seems to be a big risk that the screen will break and the cost of a new screen assembly is way to high if it does. So the question is could this be a problem of the flex cable and if so what is your advice for separiting it with minimal risk of the glass breaking? I've found a heat pad separator for around 50 $ wich im thinking would help alot and i can have use for it later too but the question is what temperature i should set it to and for how long.

⟐ Answered May 06, 2020 at 22:27 MST

sony xperia z4 tablet: LCDs wont work after replacing a cracked one.

Wed, 17 May 2023 13:31:04 -0700

Hey guys... a friend gave me his xperia z4 to replace the battery. Easy thing... so i ordered a new battery but the devil was in the details... while opening the disaplay with my ifixit tools i cracked the digitizer glass... so i needed to swap it to. the experienced tecs here may know: its a pain in the *ss to replace a digitizer so i bought a whole display für 110 on aliexpress... i even got 2... installed everything and... BLACK SCREEN. Well... got 2nd one you remember? Black Screen... So i took the old working display... nothing... "battery might be bad......" put back in the old one... nothing changes.

When i press power i feel the vibration-motor, the power led flahes and i hear some weird 8bit like sounds when pressing the volume control or by touching the display. what have i done...

Any suggestions? Bricked?

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Kurz nochmal auf deutsch:

habe beim besagten gerät akku und display tauschen wollen. nach dem wechsel beider komponenten reagiert das gerät zwar auf den power button aber das display bleibt schwarz. auch das alte display, welches nur einen glasbruch hat, bleibt aus. auch wenn ich den alten akku einsetze geht es nicht an.
Im hintergrund höre ich wenn ich die wippe drücke merkwürdige 8 bit sounds, auch wenn ich das display etwas mehr in den rahmen drücke.

Jetzt habe ich (siehe kommentar) gesehen, dass mindestens 2 Federkontakte beschädigt bzw. einer ganz ab ist. Könnte das der Grund sein oder sind die nur für den wlan empfang?

⟐ Commented May 17, 2023 at 13:31 MST