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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the 2.4G and 5G signal lines of iPhone 11 Wi-Fi circuits

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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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When checking the maps, first open the iPhone 11 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 functional block diagram, TX_5G_C0 represents 5G upper antenna transmission

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RX_5G_C0 represents 5G upper antenna receiving

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Receiving and transmission signals are connected to the filter

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After reaching the filter, the antenna signal will be shared

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TX/ RX_5G_C1 represents Wi-Fi 5G lower antenna

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2G_ANT_C0 represents 2.4G upper antenna

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2G_ANT_C1 represents 2.4G lower antenna

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The Wi-Fi signal is mainly received by the upper antenna,

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and the lower antenna is only an auxiliary function

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If the Wi-Fi has a weak signal problem, we only need to find the upper antenna line

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When the Wi-Fi 2.4G signal is weak, we need to find the Wi-Fi 2.4G line

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In the schematic diagram, pin 64 of the Wi-Fi chip is the 2.4G upper antenna

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After the line comes out of the Wi-Fi chip, it is connected to the resistor R237_W

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After passing through the resistor, we search for the signal at the back end

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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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We continue to search down,

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and after passing through the resistor, the signal is connected to the resistor R2320_K

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It is connected to pin 1 of FLANT2 after passing through the resistor

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The chip is an antenna switch,

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the left pins of the chip are the signals that need antenna,

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and the 4th pin is the antenna pin ANT

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So when looking for signals, we need to continue to look down from the ANT pin

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After pin 4 comes out, it is connected to the inductor L2300_K

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After passing through the inductor, search for the name of the inductor back end

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It is connected to pin 13 of J_UAT_K

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Jump to the bitmap according to the name,

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after determining the position of J_UAT_K in the bitmap, we look at the component map

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In the component map, J_UAT_K is the upper antenna connector

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There are volume keys, mute key, compass and other signals on the connector

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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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If the Wi-Fi 2.4G signal is weak, we can directly fly a wire to the 2.4G upper antenna pin of the Wi-Fi chip

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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