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How To Fix MacBook Pro Won’t Turn On
Apr 22nd, 2017

how-to-fix-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 on a daily newspaper. We human beings start a day from opening our eyes, whereas computers start their day by 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 be woke 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 Testing

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

macbook-pro-not-turn-on-power

2.Keyboard And Trackpad Testing

Keyboard and Trackpad no function.

macbook-pro-not-turn-on-trackpad

Preliminary Diagnosis

Trackpad and keyboard module broke down.

3.MacBook Disassembling

Disassemble the MacBook and disconnect flex cables. Remove screws and detach the motherboard. Then remove the memory.

macbook-pro-not-turn-on-disassemble

4.Motherboard Superficial Inspection

Motherboard superficial inspection with the help of a handhold magnifier.

macbook-pro-not-turn-on-inspection

5.Maintenance Drawing Referring

Roll out the maintenance bitmap and the circuit diagram for reference. Roll out Motherboard framework drawing and motherboard power system architecture afterwards.

macbook-pro-not-turn-on-drawing

6.Motherboard Voltage Testing

Locate 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 digital multimeter – all display normal value.

macbook-pro-not-turn-on-voltage

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

macbook-pro-not-turn-on-value

7.Resistance Testing

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

macbook-pro-not-turn-on-resistance

Diagnosis

Analyze with the help of maintenance bitmap and circuit diagram – U5701 broke down.

8.U5701 IC Replacing

Use 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 hot air gun.

macbook-pro-not-turn-on-ic

After that, test R5704.1 with digital multimeter again – 3.3V (normal value).

9.Assembling and Testing

Assemble the MacBook. Power button power up-failed. Plug in AC adapter to power up- successful.

macbook-pro-not-turn-on-assemble

Keyboard and Trackpad work normally.

macbook-pro-not-turn-on-trackpad

Diagnosis

Keyboard power button no response – keyboard need to be replaced.

10.Keyboard Replacing

Disconnect flex cables and detach the motherboard. Then detach the old keyboard and install a new keyboard.

macbook-pro-not-turn-on-keyboard

11.Assembling and Testing

Assemble the MacBook. Power button power up-successful. Keyboard and Trackpad work normally.

macbook-pro-not-turn-on-power-on

12.Final Fault Diagnosis

Keyboard and motherboard IC broke down resulted in the ‘not turning on’ problem.

Here is the video:

Tools & Parts Used:

Handhold Magnifier

Replacement Keyboard for MacBook Pro 13″ A1278

Digital Multimeter

Heat Resistant Insulation Pad

Hot Air Gun

BGA Paste Flux

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 info@rewatechnology.com or visit website at www.rewatechnology.com

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