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iPhone camera circuit repairing

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This video mainly explains how to find the iPhone 8P camera circuit signal and measurement points

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Search method step 1, find the position number of the camera connector in the component map

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

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Step 3, find the corresponding signals in the schematic diagram

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Step 4, jump to the bitmap according to the pin to view 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 checking the maps, we first open the iPhone 8 p component map, circuit diagram, and bitmap

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In the component map, find the position number of the camera connector

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Then search for the connector in the circuit diagram

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

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After learning the working principle, we know that

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the front camera and the rear camera are only different in power supply

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Let's find the power supply of the front camera first

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In the schematic diagram, the logo FCM represents the signal of the front camera

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The first pin of the connector is the 2.85V power supply of the front camera

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Jump to the bitmap according to the name,

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the 2.85V power supply passes through the fuse inductor FL4220

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and then connects to the camera power supply

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The 3rd pin of the connector is the 1.8V power supply of 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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Pin 20 of the connector is the 1.1V power supply of the front camera

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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 FL4210 and then connects to the camera power supply

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FCAM is not marked in the other power supply pins,

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which means that they are not the power supply of the front camera

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Let's find the I2C detection bus of the front camera

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Pin 15 of the connector is the I2C bus clock of the front camera

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Jump to the bitmap according to the name,

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the bus clock is connected to the CPU after passing through the fuse resistor R4234

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Pin 22 of the connector is the I2C bus data of the front camera

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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 R4236

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

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Pin 11 of the connector is the clock signal of the front camera

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Jump to the bitmap according to the name,

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the clock signal passes through the fuse resistor R4230 and connects to the fuse resistor R1242

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And then connects to the CPU

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Let's find the open signal of the front camera

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The 7th pin of the connector is the open signal of the front camera

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Jump to the bitmap according to the name,

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the open signal is connected to the CPU after passing through the fuse resistor R4232

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

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The front camera generally transmits data through the MIPI bus

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Pins 2, 4, 8, 10, 14, and 16 of the connector are the MIPI data buses

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Jump to the bitmap according to the name,

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the MIPI bus of the front camera is directly connected to the CPU, without fuse in the middle

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Each MIPI bus is directly connected to the CPU

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In this way, we have searched all the signals of the front camera

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When troubleshooting the front camera,

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we need to measure all the signals of the front camera

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After finding the abnormality, we can find the relevant components according to the drawings

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That's all for this video