Honor 50 mobile phone cannot be repaired by phone

Failure model: Huawei Honor 50
Fault phenomenon:no serviecs mobile phone can’t make phone call after water damage.

5g Honor 50 mobile phone can’t make a call maintenance Figure 1.

Fault analysis:
water damage first check power amplifier VCC pin corrode.
Maintenance process:

5g Honor 50 mobile phone can not make a call maintenance Figure 2.

5g Honor 50 mobile phone can not make a call maintenance Figure 3.

The power amplifier chip in the lower right corner has traces of corrode, and pin has been disconnected.

5g Honor 50 mobile phone can’t call maintenance Figure 4.

Here Jump wire.

5g Honor 50 mobile phone can’t call maintenance Figure 5.

There is no 4G signal after startup, but 5g.

5g Honor 50 mobile phone can’t call maintenance Figure6.

According to Boardview, the two power amplifier chips on the back and the two power amplifier chips in front should be in charge of 4G and 5g, but we don’t know who is in charge of whom.

5g Honor 50 mobile phone can’t call maintenance Figure7.

Redo the two chips on the back, and the fault is still the same. If you think about the two chips, there is no trace of corrode. It is estimated that they are going in the wrong direction.

5g Honor 50 mobile phone can not make a call maintenance figure 8.

5g Honor 50 mobile phone can’t make a call maintenance Figure 9.

Back to the beginning of corrode’s power amplifier, there is a chip on the right that is closest to him.

5g Honor 50 mobile phone can’t call maintenance Figure 10.

After careful observation, there are traces of corrode around the chip. The bottom pin has no serious corrode, but there is also a small amount of electrolyte.
Maintenance results: boot test, perfect repair.