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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find iPhone XS 2.4G and 5G antenna signals

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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 XS 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, 5GHZ_TX_C0 represents 5G upper antenna transmission

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5GHZ_RX_C0 represents 5G upper antenna receiving

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5GHZ_TX/ RX_C1 represents Wi-Fi 5G lower antenna

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2P4GHZ_ANT_C0 represents 2.4G upper antenna

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2P4GHZ_ANT_C1 represents 2.4G 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, 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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Pin 69 of the Wi-Fi chip is 2.4G upper antenna

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Pin 69 is connected to the resistor R237_W,

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we search for the signal at the back end of the resistor

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After passing through the resistor, it is connected to the resistor R400_W,

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and then connected to the 7th pin of TPLX2U

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The component is an antenna switch,

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pin 5 and pin 3 are the antenna signal required for making a call,

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and pin 1 is the antenna pin, ANT

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So when searching, we need to continue to search from pin 1

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Pin 1 is connected to the inductor L400_A,

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we search for the name of the inductor back end

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After searching, the signal is connected to the 4th pin of the JUAT2 antenna connector

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Jump to the bitmap according to the name,

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after determining the position of JUAT2 in the bitmap, we look at the component map

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In the component map, JUAT2 is the upper antenna connector 2

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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