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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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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 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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2G_ANT_C0 represents 2.4G upper antenna

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2G_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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If the Wi-Fi has a weak signal problem, we only need to find the upper antenna line

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When repairing the weak Wi-Fi signal, if it is found that the 5G signal is weak,

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then we need to find the line from the 5G antenna to the antenna connector

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The 5G antenna circuit has transmission and receiving pins

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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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Let's find the receiving pin first

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Pin 52 of the Wi-Fi chip is the receiving pin of the 5G upper antenna

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Search for the line name

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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 is connected to resistor R9027

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After passing through the resistor, we have to search for the name of the back end of the resistor

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After the signal passes through the resistor, it is connected to the resistor R362_W,

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and then connected to pin 14 of U_5G_UW

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The chip is an antenna filter

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The 5G transmission signal will also be connected to the chip

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Pin 50 of the Wi-Fi chip is the transmission signal for 5G

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After the line comes out of the Wi-Fi chip, it is connected to the resistor R233_W

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After passing through the resistor, we search for the signal name on the back end of the resistor

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After the signal passes through the resistor, it is connected to the resistor R363_W,

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and then connected to the pin 16 of U_5G_U_W

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Pin 16 of U_5G_U_W is the 5G upper antenna transmission signal,

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and pin 14 is the 5G upper antenna receiving signal

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We need to continue to look down from pin 6

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Search for the name of pin 6,

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After the signal comes out, it is connected to the resistor R2321_K,

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and after passing through the resistor, it is connected to FLANT6_K

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The chip is an antenna switch,

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pins 3 and 7 are the pins that need antenna,

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and pin 1 is the antenna pin ANT

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So we need to continue to look down from pin 1

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Search for the signal name,

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after the first pin comes out, it is connected to pin 12 of JUAT

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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, J_UAT_K is the upper antenna connector

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In this way, all the components connected to the 5G upper antenna line are searched

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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