Fault · Cellular
IMEI present but no signal
There's an IMEI, but it stays on “Searching…” or “No Service” with a working SIM.
View the guide steps online with your BoarDray account.
Covered on 158 models
- Samsung94With guide
- iPhone43With guide
- iPad21With guide
How to approach it
If there's an IMEI, the modem works: the fault is in the RF section. The transceiver converts the signal, the power amplifiers (PA) drive it on each band with their own tracking supply (ET, QET or APT), and the antenna switches and tuners are configured over the RFFE bus. At the end are the antenna flex cables and the coaxial cables. Start with the cheap stuff: SIM, carrier and antennas.
Other faults in Cellular
- No IMEI or modem not detectedView fault
- Weak signal or missing bandView 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 IMEI present but no signal guide next to the schematic and board view.