Fault · Cellular
Weak signal or missing band
Poor coverage, dropped calls or no 4G/5G while other phones have it.
View the guide steps online with your BoarDray account.
Covered on 158 models
- Samsung94With guide
- iPhone43With guide
- iPad21With guide
How to approach it
Each band has its own amplifier and path to the antenna. If only one technology or band is missing, the fault is usually in that band's amplifier or filter; if the signal is low on all of them, in the antennas, coaxial cables or tuners; if it drops when transmitting (during calls), in the amplifiers' tracking supply. Field test mode shows the band and the received power.
Other faults in Cellular
- No IMEI or modem not detectedView fault
- IMEI present but no signalView fault
- SIM not detectedView fault
- GPS doesn't get a fixView fault
Where to find it
- By modelEach model lists the guides that apply to it.
- By familySamsung, iPhone, and iPad already have the guide.
Models where it is covered
Samsung · 94 models
iPhone · 43 models
iPad · 21 models
See inside every board
Sign in to open the Weak signal or missing band guide next to the schematic and board view.