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iPhone camera circuit repairing

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This video mainly explains how to find the camera circuit signals

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and measurement points of the iPhone X front camera

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Search method step 1, open the iPhone X component map,

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find the front camera connector and confirm the position number

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Step 2, search for the position number in the schematic diagram

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Step 3, after finding the camera connector,

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find the corresponding signals according to the schematic diagram

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Step 4, jump to the bitmap according to the signal, and find the connected components

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We can measure the voltage and diode value at the yellow points in the bitmap

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When looking up drawings, first open the iPhone X component map, circuit diagram, and bitmap

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Find the position number of the front camera connector in the component map

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Then search for the position number in the schematic diagram

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After finding the connector, find the corresponding signals according to the block diagram

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Let's first find the 1.8V power supply from the main power supply to the front camera

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The 8th pin of the connector is the 1.8V power supply for the front camera

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Jump to the bitmap according to the name,

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the 1.8V power supply is connected to the main power supply after passing through the fuse inductor FL4200

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The 1.8V power supply of the main power supply will also be sent to the hard disk,

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CPU and camera power at the same time

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This power supply is rarely damaged during repairs

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If the measured voltage is abnormal, it is most likely because the inductance FL4200 is damaged

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Let's find the I2C bus from the front camera to the CPU

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Pins 4 and 6 are the I2C buses

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Pin 4, jump to the bitmap according to the name,

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and pin 4 is directly connected to the CPU after passing through the fuse resistor R4220

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Pin 6 is I2C bus data

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Jump to the bitmap according to the name,

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the bus data is connected to the CPU after passing through the fuse resistor R4221

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Let's find the clock signal from the CPU to the front camera

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In the schematic diagram, pin 18 is the clock signal

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Jump to the bitmap according to the name,

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the clock signal is first connected to the fuse resistor R4210,

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and then connected to the fuse resistor R1242

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After passing through the resistor, it is connected to the CPU

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The clock signal is connected to the CPU through two fuse resistors

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Let's find the 2.85V and 1.1V power supply of the front camera

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The 12th pin of the connector is the 2.85V power supply

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Jump to the bitmap according to the name,

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the 2.85V power supply is directly connected to the camera power supply U3700

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after passing through the fuse inductor FL4204

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Let's find the 1.1V power supply

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Pins 19, 20, and 23 of the connector are the 1.1V power supplies

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Jump to the bitmap according to the name,

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the 1.1V power supply passes through the fuse inductor FL4202

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and then connects to the camera power supply

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Let's look for the open signal from the CPU to the front camera

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The pin 14 of the connector is the open signal from the CPU to the front camera

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Jump to the bitmap according to the name,

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and the open signal is directly connected to the CPU after passing through the fuse resistor R4211

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Let's find the MIPI data bus from the CPU to the front camera

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There is a total of 6 lines of MIPI data bus

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Pins 3, 5, 9, 11, 15, and 17 of the connector are MIPI buses

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Jump to the bitmap according to the name,

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the MIPI bus is directly connected to the CPU,

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without a fuse inductor in the middle

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Each line is directly connected

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During maintenance, if the MIPI bus is short-circuited, the CPU is generally damaged.

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Once the CPU is broken we can't fix it

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If the front camera cannot be turned on,

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it is necessary to measure all the working conditions of the front camera

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After measuring the abnormality of the circuit,

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we can find the relevant components according to the bitmap

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That's all for this video