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iPhone camera circuit repairing

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This video mainly explains how to find the iPhone XS Max front camera signals and measurement points

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Search method step 1, open the iPhone XS 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,

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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 checking the maps, first open the iPhone XS Max 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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First find the 1.8V power supply of the front camera

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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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This power supply is rarely damaged during repairs

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If the measured voltage is abnormal,

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it is most likely because the inductance FL4200 is damaged

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

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The 1st and 6th pins of the connector are the I2C buses of the front camera

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Pin 1, jump to the bitmap according to the name,

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the bus data is directly connected to the CPU, without a fuse resistor in the middle

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Pin 6, I2C bus clock

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Jump to the bitmap according to the name,

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the bus clock is also directly connected to the CPU,

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and no other components are connected in the middle

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

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Pin 13 of the connector is the clock signal from the CPU to the front camera

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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 connected to the fuse resistor R1244

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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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Pins 19, 20,23, and 2 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 is directly connected to the camera power supply U3700

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after passing through the fuse inductor FL4202

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The 7th 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 FL4204

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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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Pin 11 of the connector is the open signal

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Jump to the bitmap according to the name,

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the open signal is directly connected to the CPU, without fuse in the middle

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

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For models above XR, the front camera uses the LPDP bus to transmit data

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There are four LPDP buses for the front camera

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Pins 10, 12, 16, and 18 of the connector are LPDP buses

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When the LPDP bus transmits data, it will pass through the coupling capacitor

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Pin 10, LPDP bus, jump to the bitmap according to the name,

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the pin is connected to the coupling capacitor C4231

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And connected to the CPU after passing through the capacitor

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Pin 12, jump to the bitmap according to the name,

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it is connected to the coupling capacitor C4230,

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and then connected to the CPU after passing through the capacitor

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Pin 16, jump to the bitmap according to the name,

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it is connected to the coupling capacitor C4233,

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and then connected to the CPU after passing through the capacitor

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Pin 18, jump to the bitmap according to the name,

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it is connected to the coupling capacitor C4232,

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and then connected to the CPU after passing through the capacitor

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If the coupling capacitor of the LPDP bus is damaged, the front camera cannot be used.

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

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Pin 15 of the connector is the LPDP bus detection signal

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Jump to the bitmap according to the name,

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it is connected the coupling capacitor C4234,

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and connected to the CPU after passing through the capacitor

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If the coupling capacitor is damaged,

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it will also cause the camera to be unusable

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If the front camera cannot be turned on,

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we need to measure all the working conditions of the front camera

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After measuring the abnormality,

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we can find the relevant components according to the bitmap

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That's all for this video