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iPhone Wi-Fi circuit repairing

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In this video we're going to learn about the terms commonly used in the iPhone Wi-Fi circuits

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After learning these terms, we can better understand the working principle of Wi-Fi circuits,

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and we can also find the signals in the circuit diagram more quickly

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In the schematic diagram, WLAN refers to the wireless local area network,

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which refers to the Wi-Fi chip

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The signal marked with WLAN in the schematic diagram indicates that the signal is a signal to the Wi-Fi chip

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BT stands for Bluetooth

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Because the iPhone Wi-Fi chip and Bluetooth chip are integrated together

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If the signal identifies BT,

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it means that the signal belongs to the Bluetooth signal

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RESET, reset signal

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REG_ON means open signal

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VIN_LDO refers to the voltage input of the voltage regulator,

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or the power supply input of small current

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DEVIC_WAKE refers to the device wake-up,

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WAKE is a wake-up signal

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UART is a universal asynchronous transceiver bus,

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mainly used to transmit data

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PCIE refers to a high-speed serial bus,

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which is also used to transmit Wi-Fi data

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TX stands for transmit signal,

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RX stands for receive signal

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The Wi-Fi signal transceiver circuit will use TX or RX to indicate

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SYNC stands for synchronization signal,

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ANT stands for antenna

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2G_ANT_CORE0 represents the upper antenna of the 2.4G frequency

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2G_ANT_CORE1 is the lower antenna of 2.4G frequency

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5G_ANT_CORE0 is the upper antenna of 5G

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5G_ANT_CORE1 is the lower antenna of 5G

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Because the iPhone has supported Wi-Fi signals in the 2.4G frequency band

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and the 5G frequency band since the 5th generation

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Therefore, there will be antenna receiving lines for two frequency band signals in the mainboard

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CLKREQ_L represents the clock interrupt or clock request

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Now, let's look at a few English terms in the schematic diagram

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For example, in the schematic diagram of iPhone 8P,

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PMU_TO_WLAN_CLK32K refers to the 32KHz clock signal of Wi-Fi

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PMU_TO_WLAN_REG_ON refers to the power on signal to Wi-Fi

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Let's take a look at the Wi-Fi circuit of the iPhone XS

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5GHZ_TX_C0 represents the transmission signal of the antenna on 5G

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5GHZ_RX_C0 represents the receiving signal of the antenna on 5G

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5GHZ_TX_C1 represents the transmission signal of the antenna under 5G

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5GHZ_RX_C1 represents the receiving signal of the antenna under 5G

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For example, 11 Pro Max model, 2G_ANT_C0 means 2.4G upper antenna

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2G_ANT_C1 stands for 2.4G lower antenna

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Another example is in the iPhone 12 Wi-Fi circuit,

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PMU_TO_WLAN_REG_ON refers to the power-on signal to Wi-Fi

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PMU_FROM_WLAN_HOST_WAKE represents the wake-up signal from Wi-Fi to the power supply

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In the iPhone schematic diagram, these terms are almost universal and can be applied in every schematic diagram

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Ok, that's all for this video