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True self V20 has no baseband (disconnection between RF and CPU)
[Fault model] Real me V20
[Fault phenomenon] No baseband
[Maintenance process] I received a machine sent by a customer for repair, the model is Zhenzi V20, and the fault is no baseband.
According to customer descriptionmobile phoneIf it has fallen, remove the motherboard to see if there are signs of collapse of the shielding cover, remove the shielding cover to detect if there are any signs of falling parts near the RF, carefully observe if there are no dropped parts or damaged chips, remove the IF and replant it. The fault is still suspected, and the resistance of the chip pad is measured, and it is found that there are two broken corners leading to the CPU pad.
True self V20 has no baseband figure 1
Fly directly to the CPU, test the resistance to be normal, then put it back into the intermediate frequency, and start the test baseband to be successfully repaired.
True self V20 has no baseband figure 2
True self V20 without baseband figure 3
True self V20 without baseband figure 4
[Maintenance result] After the motherboard is put into the shell, the mobile phone can be turned on normally. The functions of WiFi, Bluetooth, voice, charging, fingerprint, taking photos and making phone calls are all normal, and the maintenance is over.
True self V20 has no baseband (disconnection between RF and CPU)
[Fault model] Real me V20
[Fault phenomenon] No baseband
[Maintenance process] I received a machine sent by a customer for repair, the model is Zhenzi V20, and the fault is no baseband.
According to customer descriptionmobile phoneIf it has fallen, remove the motherboard to see if there are signs of collapse of the shielding cover, remove the shielding cover to detect if there are any signs of falling parts near the RF, carefully observe if there are no dropped parts or damaged chips, remove the IF and replant it. The fault is still suspected, and the resistance of the chip pad is measured, and it is found that there are two broken corners leading to the CPU pad.
True self V20 has no baseband figure 1
Fly directly to the CPU, test the resistance to be normal, then put it back into the intermediate frequency, and start the test baseband to be successfully repaired.
True self V20 has no baseband figure 2
True self V20 without baseband figure 3
True self V20 without baseband figure 4
[Maintenance result] After the motherboard is put into the shell, the mobile phone can be turned on normally. The functions of WiFi, Bluetooth, voice, charging, fingerprint, taking photos and making phone calls are all normal, and the maintenance is over.
