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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the 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,

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and there is no need to search for the lower antenna

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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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The 5G antenna circuit has transmission and receiving pins

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Both receiving and transmission signals are connected to the filter

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After coming out of the filter, the antenna pin is shared

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Let's find the 5G antenna signal of Wi-Fi

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Wi-Pin 8 of the Wi-Fi chip is the transmitting pin of 5G upper antenna,

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and pin 6 is the receiving pin of 5G upper antenna

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We first check the receiving signal

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The signal is connected to the resistor R234_W after comes out from pin 6

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After passing the resistor,

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It is connected to the resistor R362_W,

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and connected to pin 12 of U_5G_U_W after passing through the resistor

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The chip is an antenna filter,

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and both receiving and transmission signals are connected to the chip

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Let's find the transmission signal of the 5G upper antenna

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Pin 8 is connected to the resistor R233_W,

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after passing through the resistor, we search for the name of the back end of the resistor

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After searching we see that it is connected to resistor R363_W and then to pin 16 of U_5G_U_W

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Pin 16 of the chip is the 5G antenna transmission signal,

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and pin 12 is the receiving signal

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When looking for the line,

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we need to continue to look down from the ANT pin of the chip

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Search for the line name, the 6th pin is connected to the resistor R402_W,

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after passing through the resistor, it is connected to the 4th pin of the filter DPLX3U_A

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Its pin 6 is the ultra-high frequency antenna signal,

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we don't need to look for it

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The 2nd pin is the antenna pin, ANT,

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we need to continue to search along the 2nd pin

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It is connected to pin 14 of JUAT1 after passing through resistor R401_A

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Jump to the bitmap according to the signal name,

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after determining the position of JUAT1, we look at 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 for all the components connected to the 5G upper antenna line

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If the 5G Wi-Fi signal is weak,

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we can fly a wire to the 5G receiving pin of the Wi-Fi chip

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If the 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