Introduction

Does your power button not respond? Does your screen remain off even after you press the power button many times? Replacing the motherboard may solve these problems.

Use the small suction cup to lift the back panel:
  • Use the small suction cup to lift the back panel:

    • Press the small suction cup on to the middle of the back panel.

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While holding the Sony Xperia Z ultra down with your left hand, slightly pull the small suction cup upwards to create a small opening between the back panel and the front panel.
  • While holding the Sony Xperia Z ultra down with your left hand, slightly pull the small suction cup upwards to create a small opening between the back panel and the front panel.

  • While continuing to pull the small suction cup upwards, insert the spudger in the small opening.

  • Pry the front panel downwards with the spudger while continuing to pull the small suction cup upwards.

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Remove the back panel by pulling the small suction cup upwards.
  • Remove the back panel by pulling the small suction cup upwards.

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Remove the following six screws with a Phillips #000 screwdriver:
  • Remove the following six screws with a Phillips #000 screwdriver:

    • five silver 2.1 mm screws

    • one gold 3.1 mm screw

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Pry the plastic motherboard shield open by placing the spudger under the shield and running it along the edges.
  • Pry the plastic motherboard shield open by placing the spudger under the shield and running it along the edges.

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Use care to remove the motherboard shield, as it may break. The motherboard shield is made of a very thin plastic.
  • Use care to remove the motherboard shield, as it may break. The motherboard shield is made of a very thin plastic.

  • Remove the motherboard shield by lifting the lower end upwards first.

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Detach the battery connection cable by prying it upward with the spudger. Detach the battery connection cable by prying it upward with the spudger.
  • Detach the battery connection cable by prying it upward with the spudger.

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Pry the upper end of the antenna upwards with the spudger.
  • Pry the upper end of the antenna upwards with the spudger.

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Detach the antenna by pulling the upper end upwards and outwards.
  • Detach the antenna by pulling the upper end upwards and outwards.

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Insert the spudger underneath the battery and run it back and forth to remove any adhesive.
  • Insert the spudger underneath the battery and run it back and forth to remove any adhesive.

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Remove the battery from the phone.
  • Remove the battery from the phone.

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Pry the antenna assembly upwards with the spudger.
  • Pry the antenna assembly upwards with the spudger.

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You should hear a slight "click" when the antenna assembly has been completely loosened.
  • You should hear a slight "click" when the antenna assembly has been completely loosened.

  • Remove the antenna assembly by pulling it upwards from the right end.

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Remove the mic cover by placing the spudger underneath the cover and prying it upward.
  • Remove the mic cover by placing the spudger underneath the cover and prying it upward.

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The metal shield is very thin, so use care to remove the metal shield as it can easily be bent.
  • The metal shield is very thin, so use care to remove the metal shield as it can easily be bent.

  • Remove the metal shield cover by prying its right end upwards with the flat part of the spudger.

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Remove the mic connection from the motherboard ribbon by  prying it upwards with the spudger.
  • Remove the mic connection from the motherboard ribbon by prying it upwards with the spudger.

  • Once released, the orange ribbon will resemble a flap.

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Use care to remove the black plastic spacer, as it may bend if excessive force is used. The black plastic spacer is very thin and extremely fragile. Gently pry the black plastic spacer upwards with the spudger.
  • Use care to remove the black plastic spacer, as it may bend if excessive force is used. The black plastic spacer is very thin and extremely fragile.

  • Gently pry the black plastic spacer upwards with the spudger.

  • Remove the black plastic spacer from the phone by gently pulling it upwards.

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Release the LCD digitizer connection by prying it upwards with the spudger.
  • Release the LCD digitizer connection by prying it upwards with the spudger.

  • The LCD digitizer is distinguished by a longer connection strip.

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Use care to detach the vibration motor connection, as it may break if excessive pressure is applied. The vibration motor connection is tiny and fragile. Use the flat part of a spudger to detach the vibration motor connection. It is a tiny white box with red and black wires leading to the motor.
  • Use care to detach the vibration motor connection, as it may break if excessive pressure is applied. The vibration motor connection is tiny and fragile.

  • Use the flat part of a spudger to detach the vibration motor connection. It is a tiny white box with red and black wires leading to the motor.

  • Once the connection has been removed, slide the spudger underneath the vibration motor to release it from the adhesive.

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Remove the loudspeaker  connection by prying it upwards with the spudger. Remove the loudspeaker  connection by prying it upwards with the spudger.
  • Remove the loudspeaker connection by prying it upwards with the spudger.

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Remove the orange ribbon connection by prying it upwards with the spudger.
  • Remove the orange ribbon connection by prying it upwards with the spudger.

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Pry the small black metal bracket off with the spudger. Gently remove the ribbons that are attached to the side of the phone to avoid cracking them.
  • Pry the small black metal bracket off with the spudger.

  • Gently remove the ribbons that are attached to the side of the phone to avoid cracking them.

  • Remove the small black metal bracket by lifting it upwards and outwards.

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Detach the orange ribbon by wedging the spudger between the phone's casing and the ribbon. This will help prevent damage to the strip.
  • Detach the orange ribbon by wedging the spudger between the phone's casing and the ribbon. This will help prevent damage to the strip.

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Detach smaller orange ribbon by wedging the spudger between the phone's casing and the ribbon. This will help prevent damage to the strip.
  • Detach smaller orange ribbon by wedging the spudger between the phone's casing and the ribbon. This will help prevent damage to the strip.

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All parts connected to the motherboard with an orange ribbon are fragile and should be treated with extreme care. Pry up the connection strip at the end of the motherboard using the flat part of the spudger to free the motherboard.
  • All parts connected to the motherboard with an orange ribbon are fragile and should be treated with extreme care.

  • Pry up the connection strip at the end of the motherboard using the flat part of the spudger to free the motherboard.

  • The connection strip has adhesive underneath.

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Manually remove the copper tape anchoring the motherboard's black ribbon.
  • Manually remove the copper tape anchoring the motherboard's black ribbon.

  • When removing the motherboard in its entirety, make sure all securing points have been released.

Una Pregunta: Si la tarjeta logica esta buena, y es falla en el flex, se puede cambiar el flex solamente, pero veo que viene pegada al calor de fabrica en la motherboard, compre el flex original no me ha llegado de USA imagino que viene con su adhesivo para pegarlo al motherboard?

Emil Ciavatta - Reply

Conclusion

To reassemble your device, follow these instructions in reverse order.

12 other people completed this guide.

Omar Herrera

Member since: 10/07/2015

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1 Guide authored

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Cal Poly, Team 4-6, Maness Fall 2015 Member of Cal Poly, Team 4-6, Maness Fall 2015

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10 Comments

Most grateful very helpful and easy to follow thank you very much

Edward - Reply

please help me how to solder the flex cable to the motherboard

jawadsupercool - Reply

very helpful. thanks.

can anyone suggest me where to buy the motherboard of sony z ultra?

neko - Reply

Can anyone tell me how to replace flex connected to motherboard. Sony z ultra 4g

smaran727 - Reply

how much this board..???

anak zalal - Reply

can you post this board and how much...????

anak zalal - Reply

There is still no answer for the flex cable to motherboard

abraham esmeralda (abe) - Reply

how to fix powerbutton sony z ultra ? help please

test ting - Reply

Nice and clear disassembly instructions.

But Why change the board when the problem is only the power button?

What needs to be replaced is the 'faulty' Power Volume Button Flex Cable.

It will take an experienced phone technician to replace that part.

profeduards - Reply

The main flex cable is all one piece. I think they use z axis conductive tape to bond to motherboard

dustin willis - Reply

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