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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

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of iPhone 11 Pro and Pro Max

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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 iPhone 11 Pro, Pro Max

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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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First let's find the main power supply of the Wi-Fi chip

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Pins 42, 43, 44, 109, 110, 111 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 is directly connected to the battery connector

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This power supply will basically not be damaged when repairing the Wi-Fi circuit

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Let's find the 1.8V and 1.2V power supply of the Wi-Fi chip

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Pin 55 of the Wi-Fi chip is the 1.2V power supply

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Jump to the bitmap according to the name,

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

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Pin 24 of the Wi-Fi chip is the 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 also connected to the main power supply through the middle connection point

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

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Pin 191 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 clock signal is connected to the main power supply through the middle connection point

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Let's find the 1.12V and 0.9V power supply generated by the Wi-Fi chip

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Pins 32, 101, 34, and 103 of the Wi-Fi chip are the 0.9V power supplies

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Jump to the bitmap according to the name,

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the 0.9V power supply is connected to the inductor L255_W

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Connect to the capacitor C256_W after passing through the inductor,

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and returns to the Wi-Fi chip

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Pins 36, 105, 40, 107, 39, 106 of the Wi-Fi chip are the 1.12V power supplies

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Jump to the bitmap according to the name,

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the 1.12V power supply passes through the inductor L253_W and then connects to the capacitor C254_W

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Returns to the inside of the chip after passing through the capacitor

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

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Wi-Pin 294 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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and the open signal is connected to the main power supply through the middle connection point

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Let's find the PCIE bus of Wi-Fi

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There is a total of 8 lines of PCIE bus

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Pin 268 of the Wi-Fi chip is the PCIE bus reset

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Jump to the bitmap according to the name,

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and the reset signal is connected to the CPU through the middle connection point

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Pin 248 of the Wi-Fi chip 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 connected to the CPU through the middle connection point

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Pins 99, 30, 97, and 28 of the Wi-Fi chip are the PCIE bus data pins

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When the data pin is connected to the CPU,

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it will go through the coupling capacitor

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Pin 28, jump to the bitmap according to the name,

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pin 28 is connected to the CPU after passing through the coupling capacitor C1131

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Pin 97, jump to the bitmap according to the name,

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pin 97 is connected to the CPU after passing through the coupling capacitor C1130

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Pin 30, jump to the bitmap according to the name,

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pin 30 is connected to the CPU after passing through the coupling capacitor C1133

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Pin 99, jump to the bitmap according to the name,

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pin 99 is connected to the CPU after passing through the coupling capacitor C1132

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If one of these coupling capacitors is damaged or missing,

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Wi-Fi cannot be turned on

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Pins 95 and 26 of the Wi-Fi chip are PCIE bus clocks

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Pin 26, jump to the bitmap according to the name,

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the clock signal is also directly connected to the CPU

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Pin 95, jump to the bitmap according to the name,

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pin 95 is directly connected to the CPU through the middle connection point

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

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Pins 19 and 92 of the Wi-Fi chip are the test buses,

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pin 19 is the input of the test bus, TDI

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Jump to the bitmap according to the name,

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the test bus is connected to the CPU through the middle connection point

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Pin 92 is the test bus output, TDO

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Jump to the bitmap according to the name,

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the output signal is connected to the CPU through the middle connection point

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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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Ok, that's all for this video