Sony Xperia U ST25i display lighting or dark screen display but the incoming call’s & Keypad tone are working. This problem is cause by the backlight LED on the LCD that is not working or doesn’t light up.
One of the issues that have been found in Sony Xperia U ST25i is the display lighting problem.
Following are the most common Sony Xperia ST25i Lighting problems that one might encounter, these include:
Display light blinking
Dim Display Lighting
If your Sony Xperia U ST25i is encountering any such problems then all you have to do is to go with these manual as well as hardware fixes, as they will be able to solve your ST25i display lighting issue in the best possible manner. So let’s begin with,
Manual Solutions of Sony ST25i Display Lighting Problems
Remove battery & re-insert it again and check.
Remove Memory card & Sim card and check.
Make sure your battery is full or try with another full charged battery.
Hardware Solutions of Sony Xperia U ST25i Dsiplay Lighing Problems
If the above method doesn’t work then reheat or re-solder all the connectors and components on board of Display jack.
Connect any other Good Display in order to verify the problem, whether it is with your Display or connector.
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