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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the iPhone X 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 X 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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5G_ANT_CORE0 represents 5G 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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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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The pin 49 of the Wi-Fi chip si the 5G upper antenna

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Search for the name of the upper antenna, it is connected to the resistor R7711_W

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And then connected to W5BPF

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It is connected to the resistor R7702_W after passing through the filter

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According to the line name, we continue to look down

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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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The signal is connected to the 18th pin of MC_E

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Jump to the bitmap according to the name,

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after determining the position of MC_E, we can check it on the physical map

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MC_E is the flat connection antenna on the mainboard

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The middle line of the antenna is directly connected by copper wire

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The lower and the upper points of the antenna are connected

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So we need to look for the signal on the opposite side of the antenna when we check the drawing

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Search for the pin 17 signal name

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The signal is connected to the filter FL2002_E after passing through the inductor L2013_E

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The 6th pin of FL2002_E is the common terminal,

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and the 3rd pin is the low frequency signal

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So we have to continue to look down from pin 6

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After the 6th pin comes out, it is connected to the 6th pin of JUAT1 after passing through the inductor L2008_E

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

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Jump to the bitmap according to the name

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After determining the position, we look up the component map

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In the component map, JUAT1 represents the upper antenna connector

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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, it means that the Wi-Fi chip is damaged

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Ok, that's all for this video