Xiao mi 8 has no signal repair

Machine model: Xiaomi 8

Customer description: Sometimes I don’t read the card, my mobile phone no serviecs and WiFi can’t be turned on.

Test result: none

Fault analysis: the SIM card can’t be identified, the signal can’t be searched, and the WiFi can’t be turned on. These faults are generally circuit faults of the signal part.

openXinzhizao Soft software, find the physical annotation drawing of Xiaomi 8, and check the appearance of the motherboard according to the location annotation to see if there is any obvious damage, especially the periphery of RF chip.

Xiao mi 8 has no signal repair Figure 1.

Xiao mi 8 has no signal repair Figure 2.

After inspection, it is found that the signal circuit shielding cover has a sign of collapse. This fault should be caused by the mobile phone falling, generally RF chip Inveracious Soldering. After shielding cover is removed,Repeat welding RF chip is repaired.