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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the Wi-Fi circuit signals and measurement points of iPhone 8P

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Search method step 1, find the Wi-Fi chip position number in the component map

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

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Step 3, find the corresponding signals according to the circuit diagram

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

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and we can measure the voltage and diode value at the yellow position in the bitmap

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When checking the maps, first open the component map, circuit diagram and bitmap of the iPhone 8P

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Find the Wi-Fi chip in the component map and confirm the position number,

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then search for the Wi-Fi position number in the schematic diagram

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After searching for the Wi-Fi chip, find the corresponding signals

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Let's find the main power supply first

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Pins 15, 16, 29, and 30 of the Wi-Fi chip are the main power supply pins

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Jump to the bitmap according to the name,

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the main power supply will connect many components

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This power supply is rarely damaged

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Let's find the 1.8V power supply of Wi-Fi

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Pin 32 of Wi-Fi is 1.8V power supply

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Jump to the bitmap according to the name,

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the 1.8V power supply is directly output by the main power supply,

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it is the same as the 1.8V power supply of the CPU and audio

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The power supply will basically not be damaged

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Let's find the 32KHz clock signal of the Wi-Fi

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Pin 122 of the Wi-Fi chip is a 32KHz clock signal

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Jump to the bitmap according to the name,

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the signal is directly connected to the main power supply,

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and no other components are connected

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Let's find the VIN_LDO power supply of the Wi-Fi chip generated by itself

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Pins 147 and 119 are the pins for Wi-Fi to generate power for itself

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Jump to the bitmap according to the name,

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the pins pass through the capacitor C7604 and connects to the inductor L7600_W,

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then returns to the inside of the chip

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Let's find the wake-up signal from the CPU to the Wi-Fi

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Pin 89 of the Wi-Fi chip is the wake-up signal from the CPU to Wi-Fi

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Jump to the bitmap according to the name, and the wake-up signal is directly connected to the CPU

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When measuring, we can measure the wake-up signal at the test point

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Let's find the open signal from the main power supply to the Wi-Fi chip

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Pin 86 of the Wi-Fi chip 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 main power supply,

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without a fuse resistor in the middle

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Let's find the PCIE bus from the CPU to Wi-Fi

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Pin 87 of Wi-Fi is the PCIE bus clock request

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Jump to the bitmap according to the name,

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the clock request signal is directly connected to the Wi-Fi chip

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Pin 88 of Wi-Fi is PCIE bus reset

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Jump to the bitmap according to the name, and the bus reset is directly connected to the CPU

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Pins 19, 20, 25, and 26 of the Wi-Fi chip are data pins

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The data pins are connected to the CPU, and the coupling capacitor will be passed in the middle

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Pin 19, jump to the bitmap according to the name

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Pin 19 is connected to the CPU after passing through the coupling capacitor C1132

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Pin 20, jump to the bitmap according to the name

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The pin 20 signal is connected to the CPU after passing through the coupling capacitor C1133

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Pin 25, jump to the bitmap according to the name

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Pin 25 is connected to the CPU after passing through the coupling capacitor C1130

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Pin 26, jump to the bitmap according to the name

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Pin 26 is connected to the CPU after passing through the coupling capacitor C1131

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If one of these coupling capacitors is damaged or falls off, Wi-Fi cannot be turned on

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Pins 22 and 23 of the Wi-Fi chip are PCIE bus clocks

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Pin 22, jump to the bitmap according to the name,

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The pin 22 clock signal is directly connected to the CPU

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Jump to the bitmap according to the name,

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the 23 pin clock signal is also directly connected to the CPU

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Let's find the UART bus from the CPU to the Wi-Fi chip

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The UART bus has two sets

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Pins 170 and 150 of the Wi-Fi chip are the first set of UART buses,

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and pins 171 and 169 are the second set of UART buses

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Pin 170, jump to the bitmap according to the name,

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the signal is directly connected to the CPU

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Pin 150, jump to the bitmap according to the name,

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and this bus is also directly connected to the CPU

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Pin 171, jump to the bitmap according to the name, this bus is also directly connected to the CPU

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Pin 169, jump to the bitmap according to the name,

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the pin 169 UART bus is also directly connected to the CPU

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In this way, we have completed the search of the main working conditions and signals of Wi-Fi

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If Wi-Fi cannot be turned on, we need to measure the working conditions on the left side of Wi-Fi

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Ok, that's all for this video