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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 the measurement points of the iPhone XS
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Search method step 1, find the Wi-Fi chip position number in the component map
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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, 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 XS
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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 find the main power supply of the Wi-Fi chip
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Pins 33, 34, 35, 102, 103, 104 of the Wi-Fi chip are the main power supply pins
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Jump to the bitmap according to the name, the main power supply will connect many components
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When actually overhauling the Wi-Fi circuit,
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this power supply is rarely damaged
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Let's find the 1.8V power supply of the Wi-Fi chip
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Pin 23 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 provided by the main power supply,
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and the power supply of the audio chip and the CPU is the same way
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In actual maintenance, this power supply is rarely damaged
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Let's find the 32KHz clock signal of the Wi-Fi chip
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Pin 54 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 directly connected to the main power supply through the middle connection point
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Let's find the 1.12V power supply and 0.9V power supply generated by the Wi-Fi chip
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Pins 109, 42, 112, 45, 113, and 46 are 1.12V power supply pins
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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
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and then connects to the capacitor C254_W
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Return to the inside of the Wi-Fi chip after passing through the capacitor
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Pins 107, 40, 105, and 38 of the Wi-Fi chip are 0.9V power supply pins
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Jump to the bitmap according to the name,
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the 0.9V power supply passes through the inductor L255_W and then connects to the capacitor C256_W
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Return to the inside of the Wi-Fi chip after passing through the capacitor
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Let's find the open signal of the Wi-Fi chip
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Pin 111 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 directly connected to the main power supply through the middle connection point
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Let's find the PCIE bus from the CPU to the Wi-Fi chip
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There is a total of 8 lines of PCIE bus
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Pin 117 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 directly connected to the CPU through the middle connection point
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Pin 116 of the Wi-Fi chip is the PCIE bus clock request pin
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Jump to the bitmap according to the name,
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the clock request signal is also connected to the CPU through the middle connection point
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Pins 97, 28, 99, and 30 of the Wi-Fi chip are PCIE data pins,
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and when the data pins are connected to the CPU, they will pass through the coupling capacitors
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Pin 97, jump to the bitmap according to the name
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Pin 97 is connected to the capacitor C1131 through the middle connection point
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and then connected to the CPU after passing through the 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 capacitor C1130
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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 capacitor C1133
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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 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 Wi-Fi are PCIE bus clock pins
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Pin 95, jump to the bitmap according to the name,
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the clock signal is directly connected to the CPU through the middle connection point
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Pin 26, jump to the bitmap according to the name,
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Pin 26 is also directly connected to the CPU through the middle connection point
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Let's find the UART bus from the CPU to Wi-Fi
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There are two groups of UART buses
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Pins 90 and 21 of the Wi-Fi chip are the first UART bus,
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and pins 20 and 91 are the second UART buses
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The English logo is BT_UART
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Inside the signal conversion box, we can see its name is AP_TO_BTWLAN
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Explain that it is a UART bus shared by Wi-Fi and Bluetooth
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Pin 90, jump to the bitmap according to the name,
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pin 90 UART is directly connected to the CPU
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Pin 21, jump to the bitmap according to the name,
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Pin 21 UART is connected to the CPU through the middle connection point
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Pin 20, jump to the bitmap according to the name,
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The signal is connected to the CPU through the middle connection point
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Pin 91, jump to the bitmap according to the name,
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the signal is also 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 of Wi-Fi
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If one of these conditions is abnormal, the Wi-Fi cannot be turned on
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Ok, that's all for this video
