Solution For iPhone 5s No Wi-Fi and Motherboard Disconnect

If you come across the situation that iPhone 5s no Wi-Fi, so caused the motherboard disconnect, don' t worry, vip fix shop team can help you. 

Trouble phenomenon:
iPhone 5S no WIFI, the address of wireless LAN is unknown, WIFI button is greyed out, there is Bluetooth address but the Bluetooth always in circling.

Repair Process:
1. Check the few original pieces on the back of the WIFI chip and found that these pieces are still on the right position, as shown in picture 3-4-1.

 

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2. Disassemble the WIFI chip and then measure the diode data of the pad by digital multimeter and found the signal of 51 pin WLAN_REG_ON has no data, as shown on picture 3-4-2, but in normally it should be 500+.

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3. After check the circuit diagram and found this signal is directly connected to the power IC E11 pin, as shown in picture 3-4-3. So, we initially judge either the power chip was broken or the circuit board was disconnection.

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4. Put the WIFI chip on the PCB holder, then remove the power chip and check the data between two points, the result is infinite, as shown in picture in 3-4-4 according to this we can prove the circuit board was disconnection.

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5. This signal line is in the middle of the solder pad, and we measure it with multimeter, as shown in picture 3-4-5, we can see that these are normal.

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6. Jump wire from power chip pad to the bottom of WIFI chip. The photos are as follows 3-4-6 and 3-4-7.

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7. Make the pin on Power IC, and clean it with chip graver tool, then assemble the WIFI module and power chip. As shown in picture 3-4-8, 3-4-9 and 3-4-10.

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8. Test it, and all is fine, now just install the shield, then the problem of iPhone was resolved and you can use it normally

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