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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the iPhone 8P Wi-Fi signal transceiver line

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Step 1. find the Wi-Fi location number in the component map

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Step 2, search for the Wi-Fi location number in the schematic diagram

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Step 3, find the corresponding antenna pin in the schematic diagram

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Step 4, search for the pin identification in the schematic diagram,

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find the connected components, and finally find the antenna screw post

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We can also jump to the bitmap according to the name to view the connected components

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

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Find the Wi-Fi location number in the component map

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Then search for the Wi-Fi location number in the schematic diagram

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After finding the Wi-Fi chip, find the corresponding signals

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In the block diagram, 2G_ANT_CORE0 represents the 2.4G upper antenna

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2G_ANT_CORE1 represents the 2.4G lower antenna

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5G_ANT_CORE1 represents the 5G lower antenna

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5G_ANT_CORE0 represents the 5G upper antenna

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When the mobile phone is searching for a signal,

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it mainly relies on the upper antenna to search for the signal,

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and the lower antenna is only an auxiliary function

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When we check the weak Wi-Fi signal,

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we only need to find the signal of the upper antenna,

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and there is no need to search for the lower antenna

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If the 2.4G signal is found to be poor during maintenance,

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we need to search for the 2.4G antenna signal and find the damaged components

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If we find that the 5G signal is relatively poor, we need to find the 5G lines

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Let's find the 2.4G upper antenna line first

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In the schematic diagram, the third pin of the Wi-Fi chip is the 2.4G upper antenna

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We search for the signal name,

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the upper antenna is connected to pin 7 of W2XSW_W

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The chip is an antenna control chip

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Pin 1 is for power supply, pin 3 is for switch control signal,

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pins 4 and 5 are signals for connecting 2.4G lower antenna

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After being excluded in turn, the 8th pin is the output pin of the 2.4G upper antenna

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Pin 8 is connected to the inductor L7704_W,

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we search for the name of the inductor

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In the schematic diagram, the box that does not identify the coordinates of the pin is the signal conversion box,

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we do not need to check

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After searching, we see that this signal is connected to pin 6 of MCEW_EF,

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enters from pin 6, and exits from pin 19

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MCEW is the connection antenna in the mainboard,

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which belongs to the copper wire connection,

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and the solder points are connected with the solder points on the opposite side

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So when searching in the schematic diagram, we search for the opposite pin 19

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Pin 19 is connected to the resistor R2002E,

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and connected to the first pin of the filter FLQPLX_E after passing through the resistor

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The chip is an antenna switching chip,

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the 5th pin is the antenna input pin ANT,

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and the other pins are the pins that need the antenna

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When connected to Wi-Fi, the chip will switch the antenna signal to the Wi-Fi pin

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So when looking for the line, we have to continue to search from the 5th pin

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The pin 5 is connected to the resistor R7751_EF,

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then connected to the resistor R7753_EF after passing through the resistor,

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and then connected to the antenna buckle JUAT1_EF

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Antenna buckle refers to the button that buckles the antenna in the mainboard

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The internal structure of the antenna buckle is that pins 1 and 2 are connected,

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and the antenna can be buckled on it

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The mainboard of the iPhone 8P does not have an external antenna,

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so we can only continue to search along the 2nd pin

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Pin 2 is connected to the inductor L6701_EF,

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and then connected to the capacitor C6738_EF

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Connects to the screw post SUAT1_EF after passing through the capacitor

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SUAT1_EF refers to the 2.4G upper antenna screw post

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Jump to the bitmap by the name,

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we can see the position of the screw post

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In the physical picture, the screw post refers to the 2.4G upper antenna screw post

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In this way, we have searched for all the components connected to the line of the 2.4G upper antenna

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When troubleshooting the poor 2.4G signal,

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we can fly the wire directly from the screw post to the Wi-Fi chip, skipping the components

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If the Wi-Fi signal is still poor after flying the wire,

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it means that the Wi-Fi chip is damaged

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Ok, that's all for this video