How To Fix MacBook Pro Won't Turn On

Blake Apr 22, 2017
1459


MacBook Pro Won't Turn On

 

"Every day starts, my eyes open and I reload the program of misery. I open my eyes, remember who I am, what I'm like, and I just go, ‘Ugh'.”You may have heard this famous sentence from a popular TV show or read it in a daily newspaper. We human beings start a day from opening our eyes, whereas computers start their day with the power button on their body. It is well known that Macs are well built and for the most part reliable. Still, they are computers and computers need to wake up before getting to work. However, we've noticed a number of "My MacBook Pro won't turn on" posts, and solutions are not so easy to be found. Theoretically speaking, ‘MacBook Pro won't turn on’ problem usually relates to one of two things. Either the display is malfunctioning, which means the computer is on, and you just can’t see that it is. Or there is some kind of power-related issue that is preventing it from turning on as expected. REWA LAB has been working on MacBook repair these days, and in this tutorial, we look at the steps you need to take to fix your MacBook Pro 13" A1278  if it won't turn on when pressing the power button.

 

1.Power Button Power Up

 

TestingPower button power up-failed. Plug in AC power adapter to power up- successful.

 


Fix MacBook Pro

 

2.Keyboard And Trackpad TestingKeyboard and Trackpad no function.

 


Fix MacBook Pro Won't Turn On

 

Preliminary  DiagnosisTrackpad and keyboard module broke down.3.MacBook DisassemblingDisassemble the MacBook and disconnect flex cables. Remove screws and detach the motherboard. Then remove the memory.

 


DiagnosisTrackpad and keyboard module broke down

 

4.Motherboard Superficial InspectionMotherboard superficial inspection with the help of a handheld magnifier.

 


Motherboard Superficial InspectionMotherboard

 

5.Maintenance Drawing ReferringRoll out the maintenance bitmap and the circuit diagram for reference. Roll out Motherboard framework drawing and motherboard power system architecture afterward.

 


Maintenance Drawing ReferringRoll out

 

6.Motherboard Voltage TestingLocate voltage 12.56 V, common point voltage 3.42V, voltage 5V, voltage 3.3V, voltage 1.5V, voltage 1.0V, voltage 0.9V, voltage 1.1V. Connect AC adapter and test them with a digital multimeter - all display normal value

 

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Motherboard Voltage TestingLocate voltage 12.56 V

 

Disconnect AC adapter and install the memory. Then connect AC adapter and test, voltage value jumps from 1.1V to 0.8V- normal circuit.

 


Disconnect AC adapter and install the memory

 

7.Resistance TestingTest keyboard port pins and peripheral component value with diode mode. Then connect AC adapter and test keyboard port power supply voltage with a digital multimeter. Resistor R5704.1 displays no voltage (3.3V under normal circumstances)0

 

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Resistance TestingTest keyboard port pins and peripheral component

 

DiagnosisAnalyze with the help of maintenance bitmap and circuit diagram - U5701 broke down.8.U5701 IC ReplacingUse a metal plate to protect keyboard port from high temperature, then take down the damaged U5701 IC with hot air gun. Apply some BGA paste flux to the bonding pad and align the new IC with a hot air gun.

 


DiagnosisAnalyze with the help of maintenance bitmap and circuit diagram

 

After that, test R5704.1 with digital multimeter again - 3.3V (normal value).9.Assembling and TestingAssemble the MacBook. Power button power up-failed. Plug in AC adapter to power up- successful.

 


After that, test R5704.1

 

Keyboard and Trackpad work normally.

 


Keyboard and Trackpad work normally

 

DiagnosisKeyboard power button no response - keyboard need to be replaced.10.Keyboard ReplacingDisconnect flex cables and detach the motherboard. Then detach the old keyboard and install a new keyboard.

 


DiagnosisKeyboard power button no response

 

11.Assembling and TestingAssemble the MacBook. Power button power up-successful. Keyboard and Trackpad work normally.

 


Assembling and TestingAssemble the MacBook

 

12.Final Fault Diagnosis

 

Keyboard and motherboard IC broke down resulting in the 'not turning on' problem.

 

Click to watch the video of MacBook Pro Won't Turn on:

 

 

  • Tools & Parts Used:
  • Handheld Magnifier
  • Replacement Keyboard for MacBook Pro 13" A1278
  • Digital Multimeter
  • Heat Resistant Insulation Pad
  • Hot Air Gun
  • BGA Paste Flux

 

If you want to order the tools used in the video please go to  https://shop.rewa.tech/ For more details on repairing guide, please go to REWA YouTube channel . REWA LAB provides screen repair services as well as motherboard repair services for those in need. As for LCD refurbish machines, materials, demo videos and technical support, please feel free to contact us via service@rewa.tech or comment below.

 

And you can also learn our other guides like  MacBook air ram upgrade and Samsung Galaxy S7 edge glass replacement .

 

 

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