Fault · Cellular
No IMEI or modem not detected
*#06# shows no IMEI, “Modem Firmware” is blank, or restarts that name the baseband.
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Covered on 158 models
- Samsung94With guide
- iPhone43With guide
- iPad21With guide
How to approach it
The modem is a separate system: its PMU (BBPMU) takes VDD_MAIN and generates the baseband and transceiver rails; the baseband boots once the PMU gives it power and a clock (32 kHz and 19.2, 38.4 or 76.8 MHz) and releases reset, and the CPU detects it over PCIe (HSIC on the iPhone 6). The baseband EEPROM stores data unique to that board. If there's no IMEI, the CPU can't see the modem: check in this order, power, control, clock, link and EEPROM.
Other faults in Cellular
- IMEI present but no signalView 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
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