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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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Let's find the 5G upper antenna of iPhone 8P

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The pin 49 of the Wi-Fi chip is 5G upper antenna

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Search for the signal name,

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the upper antenna is first connected to the resistor R7711_W

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After passing through the resistor, it connects to the filter W5BPF_W,

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and then connect to the resistor R7702_W

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We don't need to look for the grounded components

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After passing through the resistor, we search for the logo behind the resistor

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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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It connects to the pin 10 of MCE_W after passing the resistor

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Jump to the bitmap according to the name, MCEW is the antenna on the mainboard

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The antenna is a flat wire, and the inside is connected by a copper wire

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The solder points on the left are connected to the solder points on the right

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Therefore, when looking up the circuit diagram,

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it is necessary to search for the opposite signal

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Search for the name of the pin 27,

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pin 27 is connected to the inductor L7751_EF,

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after passing through the inductor,

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it is connected to the third pin of the filter FL20021

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The 6th pin is the common port of the COM port

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After the 6th pin comes out,

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it is connected to the antenna buckle JUAT2 after passing through the resistor R7752_EF

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In the bitmap we can see the position of the antenna buckle

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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 iPhone 8P model does not have an external antenna,

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so when we look for the signal, we can only continue to search along the second pin

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The second pin of the antenna buckle is connected to the capacitor C7731_EF,

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and then connected to the screw post SUAT2

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SUAT2 is the 5G upper antenna screw post

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In the bitmap we can check the position of the screw post

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The screw post under the antenna switch is the 5G antenna screw post

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In this way, we have searched all the components from the Wi-Fi chip to the antenna screw post

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When troubleshooting the weak 5G Wi-Fi signal,

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we can fly a wire from the Wi-Fi antenna pin to the screw post

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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