iPhone display circuit repairing

This video mainly explains how to find the display circuit signals

and measurement points of the iPhone 12 and 12Pro models

Step 1, find the display connector in the component map

Step 2, find the display connector in the bitmap, and confirm the position number

Step 3, search for the position number in the circuit diagram,

and find the corresponding signal in the display connector according to the schematic diagram

Step 4, jump to the bitmap to view the connected components

The yellow position in the bitmap can measure the voltage and diode value

When searching, we first open the iPhone 12 and 12 Pro component map, circuit diagram, and bitmap

Find the display connector in the component map,

and then determine the position number of the display connector in the bitmap

Search for the position number in the schematic diagram

After finding the display connector, find the corresponding signals according to the circuit diagram

Let's find the 1.8V display power supply first

The pin 12 of the display connector is 1.8V power supply

Jump to the bitmap according to the name,

this power supply passes through the fuse inductor FL11502 and then connects to the main power supply

The power supply will use the same road as the power supply of chips such as CPU

When overhauling the display circuit, if there is no 1.8V power supply,

most of the fuse inductors FL11502 are damaged

Let's find the I2C bus

The 7th and 9th pins of the display connector are I2C buses

Jump to the bitmap according to the name,

the I2C bus is directly connected to the CPU

The I2C bus of pin 9 is also directly connected to the CPU

Let's find the 3V, 1.2V and 1V power supplies

The pin 14 of the display connector is the 3V power supply

Jump to the bitmap according to the name,

the 3V power supply is connected to the main power supply after passing through the fuse inductor FL11501

The pin 16 of the display connector is 1.2V power supply

Jump to the bitmap according to the name,

the 1.2V power supply is directly connected to the main power supply,

which is the same way as the 1.2V power supply of the CPU

The pin 18 of the display connector is the 1V power supply

Jump to the bitmap according to the name,

the 1V power supply is also directly connected to the main power supply

Let's find the 32KHz clock signal sent by the main power supply to the display

The pin 21 of the display connector is the 32KHz clock signal of the display

Jump to the bitmap according to the name,

the clock of the display is directly connected to the main power supply without fuse

Let's find the reset signal of the display

The pin 13 of the display connector is the reset of the display

Jump to the bitmap according to the name,

the reset signal of the display screen is directly connected to the main power supply,

and at the same time connected to the display power supply

It means that the reset signal of the display screen and the reset signal of the display power supply are the same way

Let's find the display power supply start signal

sent by the display to the display power supply,

VOUT1 2_EN and VOUT3_EN

display connector pin 19 is VOUT3_EN

Jump to the bitmap according to the name,

It is directly connected to the display power supply,

and also connected to the main power supply

There is no fuse resistor in the middle

Pin 20 is VOUT1 2_EN

Jump to the bitmap according to the name,

the signal in the bitmap is missing the logo CONN

VOUT1 2_EN is directly connected to the display power supply without a fuse resistor in the middle

Ok, that's all for this video