To disassemble iPhone 4, you need to use a special Phillips screwdriver # 00, and a five-blade screwdriver, called pentalobe, and is designed for this device.
Once the screws on the side frame have been loosened, the back cover can be removed. This allows it to be replaced if necessary.
After removing the back panel, you can see how the iPhone 4 works inside. The battery occupies most of the internal plane of the phone. Take it out.
In this model, the battery is not soldered.
Take out the sim card.
The plastic label has an inscription that states that only employees of an authorized service center can use it.
To continue disassembling, you need to unscrew 5 screws, then remove the electromagnetic shield.
There are many connectors underneath.
To access the main board, you need to remove a few more shields that protect the insides of the phone.
To remove them, you need to use a plastic tool, which you need to carefully pry off the unscrewed parts.
Unscrew the vibration motor located on the upper right.
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It looks like this.
The 5 megapixel camera is located in the opposite corner from the vibration motor.
You can get to the motherboard only after removing the cover, which is located above the antenna and speakers at the bottom of the device.
This is what the motherboard looks like iPhone 4.
There are also modules Wi-Fi, Bluetooth, GPS, UMTS, GSM. After removing the electromagnetic shields, access to the processor is opened (lettering A4).
This part contains accelerometers and other chips.
At the top of the case there is a lighting speaker, a microphone for suppressing extraneous noise.
You can also remove the front camera.
Next, the front panel is removed.
To do this, you need to lightly pry it off with a plastic tool.
The body is made of stainless steel, the protection of the Gorilla Glass panel is used.
The glass can now be replaced if necessary. If there are no tools, it is better to contact the service center