How to fix no image/black screen issue in Sony Xperia Z3

Introduction

If your Sony Xperia Z3 smartphone shows no image but the backlight is working, there may be a problem with the phone’s logic board. This problem can occur because of failed screen replacement attempts. Use this guide to repair your device.

Alternatively, see this Sony Xperia Z3 no image after screen replacement YouTube video for help micro-soldering the logic board.

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Vidéo d'introduction

Sony Z3 no image after screen replacement only backlight Hardware Repair

Étape 1 Back Cover

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Heat the back cover of your Xperia Z3 to loosen the adhesive underneath.
If you use an iOpener, follow these instructions for use.
Lift up the back cover with a suction handle and put an opening pick in the gap.
Move the pick carefully around the edges to loosen the adhesive on every side of the phone.
Don't put the pick in too deep under the back cover to not damage any parts inside the phone.

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Étape 2

There are two adhesive strips in the center of the phone connecting the rear case to the battery, you'll need to remove them to open the phone.
When the edges of the cover are free from adhesive, tilt it to allow access to the battery tabs.
Use tweezers to pull the two black adhesive strips out of the phone but don't pull just yet.

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Étape 3

Gently pull out both of the adhesive tabs out of the phone, parallel to the rear cover.
If the adhesive tabs break, try to use a thin flat plastic tool such as a plastic card to remove the last of the adhesive. If the adhesive is stubborn, heat it with an iOpener or hair dryer and pry again.

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Étape 4

After pulling out the adhesive tabs, you can lift the back cover and remove it.

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Étape 5 Battery

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Unplug the battery flex connector.
Use a tweezer to gently pull off the adhesive strip on the bottom part of the battery.

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Étape 6

Use a spudger on the left side of the frame to lever out the battery.
Be careful with the spudger - there are cables beneath the battery!
Remove the battery.

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Étape 7 How to fix no image/black screen issue in Sony Xperia Z3

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Use your fingers or the flat end of a spudger to unclip the cables holding the logic board in place.

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Étape 8

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Use your fingers to remove the phone's logic board.
Visually inspect the logic board.
This logic board is missing filters, which were likely damaged when the user attempted to replace the phone's display.

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Étape 9

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Apply a small amount of flux to the motherboard's filters.
In micro-soldering, flux prepares the metal surfaces of the logic board by cleaning and removing impurities.
Wait at least 30 seconds for the flux to clean the surfaces.
Use a pair of micro-soldering tweezers to remove the metal square from the filters.

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Étape 10

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Apply solder to each of the three sets of four pins now exposed on the logic board.
After each solder, apply a small amount of flux to the new connection to clean the connection.
Be sure to wait at least 30 seconds after applying the flux so that it can clean and remove impurities.

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Étape 11

Check that each of the connections covers all four of the pins in each set.
Re-form the solder or add additional solder if the connection does not cover all four pins.

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