Redmi AX5400 Gaming Edition 5G signal weak maintenance

corecool

Netizen's machine, the user said that the 5G signal is half a meter away from the router and is gone, and after receiving it, it is detected, the 5G signal is close to the route is very weak, the indicator light is red, and the wired and 2.4G are normal:











Disassembly detection, found that the 5G power amplifier (QPF4588) has a white burn mark on the surface:





After removing the bad power amplifier, the 5V resistance of the power amplifier to the ground is only more than 100, and the normal is more than 360, which is abnormal:




I can only disassemble the remaining three power amplifiers for testing, and find that the resistance value of the 22-pin VCC to the ground of the power amplifier is only more than 300, and the normal should be about 1200:




Next, the damaged four 5G power amplifiers can only be replaced, and the 5G signal will return to normal after the replacement:











By the way, I change the aging indicator light, too:





Finally, thank you for watching, friends who need to repair electronic products contact v:corecool001

daney_he

The quality is really poor, and K2P is estimated to be fine in another 5 years

corecool

daney_he Posted on 2025-6-9 16:21
The quality is really poor, and K2P is estimated to be fine in another 5 years

The K2P signal is good and sufficient

mzk44j

corecool Posted on 2025-6-9 16:58
The K2P signal is good and sufficient

Add you, pass it

pig13700

It is estimated that the machine is still too hot and the original cannot bear it

kinkit

32+512+ K2P for capacitors, which can still be played at present

corecool

pig13700 Posted on 2025-6-10 09:47
It is estimated that the machine is still too hot and the original cannot bear it

Our temperature is not high, and this machine is hot to the touch

corecool

kinkit Posted on 2025-6-10 11:19
32+512+ K2P for capacitors, which can still be played at present

It's enough to simply not go shopping

afeng11

Come in and study it, and support one by the way