Null / Unknown
Stay in modem initialization. Do not jump to PA, antenna or RFFE repair.
ANDROID DIAGNOSTICS / NETWORK • BASEBAND • RF
Network / Baseband
Network / Baseband
deep diagnostic engine
Trace network faults from SIM detection through modem power, RF clocks, control buses, transceiver, PA/LNA/ET and antenna systems.
LIVE RF SIGNAL & POWER CHAIN
SIMVSIM / ATR
MODEMBB / NVRAM
XOPower / Clock
RFFEControl
RFICWTR / SDR
PAET / LNA
ANTMIMO / Coax
Each stage becomes evidence only when its power, control and signal behavior is confirmed.
01 — SEQUENTIAL BENCH PATH
Follow the cellular chain in order
The richer uploaded source organizes Network/Baseband as SIM → modem → power/clocks → bus → transceiver → PA/front-end → antenna.
02 — BASEBAND CORE GATE
Prove the modem is alive before RF repair
IMEI/baseband state, modem rails, reference clock and AP↔modem communication should be checked before entering PA/RFFE/front-end diagnosis.
Rail missing
Check modem PMIC / buck / enable and loading before modem BGA conclusions.
No reference clock
Verify the correct platform clock and probe method before blaming RFIC/modem.
No communication
Separate hardware bus failure from modem firmware/EFS/NVRAM corruption.
SOFTWARE vs HARDWARE
Do not mix modem-image faults with RF board faults
Modem image / EFS / NVRAM / NVDATA
Use when IMEI/baseband identity, modem partitions, calibration/NV data or modem-crash evidence suggests software/state corruption.
Modem rails / clock / IPC
Use when modem initialization fails with missing or unstable core/I/O rails, reference clock or AP↔modem communication.
RFFE / RFIC / PA / LNA
Enter only after modem core is alive and the symptom points to scan, registration, band or TX/RX behavior.
03 — RF MEASUREMENTS & BAND CONTEXT
Combine network metrics with board measurements
RSRP/RSRQ/SINR, serving band, registration and TX behavior help separate network/configuration issues from RF hardware faults.
Reference signal power
Useful for receive strength. Compare against a known-good phone on the same carrier/location before board conclusions.
Reference signal quality
Poor quality with reasonable RSRP can indicate interference/network loading rather than a simple antenna-open condition.
Signal vs interference/noise
Low SINR can explain poor throughput even when raw signal power looks acceptable.
Uplink demand
High requested TX power plus supply collapse or PA/ET abnormality strengthens the transmit-path hypothesis.
4G / LTE DIAGNOSTICS
LTE problems, measurements and repair routes
Use this section for SIM/IMEI/baseband, LTE registration, RX/TX, RFFE1, LTE PA/ET, antenna and call-drop faults.
SIMMODEMLTE RFICRFFE1PA / ETANT
SELECTED 4G PROBLEM
EVIDENCE ROUTE
What to check first
Bench measurements
Probable stage
4G RX vs TX DECISION
Use manual search and registration to choose the branch
Manual network search fails
RF clock
RFIC rails
RFFE
LNA / filter
Antenna
- Confirm transceiver power and reference clock.
- Observe RFFE activity where possible.
- Check receive LNA/diversity/tuner supply.
- Inspect coax/antenna only after control/power evidence.
Operators found but registration/call fails
SIM / network
PA VPH
ET / VPA
RFFE PA ctrl
TX antenna
- Successful search means meaningful RX progress, not “100% RX healthy”.
- Watch VBAT/VSYS during registration or call.
- Measure PA VPH and dynamic ET/VPA.
- Confirm RFFE PA control before replacing PA/ET.
LTE BAND / FRONT-END SELECTOR
Load a band-family diagnostic path
LTE FAILURE MATRIX
Problem → Evidence → Next proof
| 4G Problem | Primary Evidence | Likely Domain | Confirmation | Repair Direction |
|---|
5G / NR DIAGNOSTICS
5G NSA/SA, n77/n78, MIMO and UHB front-end
5G troubleshooting must separate the LTE anchor from the NR-specific control, power, PA/LNA and antenna paths.
LTE ANCHORNR CTRLRFFE25G PA / ETLNAMIMO
4G anchor + 5G secondary cell
A 5G icon can appear while the NR data path still fails. Do not equate icon presence with a healthy 5G TX/RX chain.
Standalone NR
Availability depends on device, firmware, carrier and region. Verify supported bands/mode before hardware conclusions.
n77 / n78 front-end
Source material emphasizes RFFE2, 5G PA/ET and high-band receive/diversity paths for n77/n78-type failures.
Diversity / coax
Multiple antenna paths affect 5G sensitivity and throughput. Inspect every secondary coax and LNA branch used by the exact model.
SELECTED 5G PROBLEM
NR ROUTE
What to check first
Bench measurements
Probable stage
NSA vs SA DECISION TREE
Different entry conditions, different fault domains
NR BAND / UHB SELECTOR
Separate band support from hardware path failure
5G PATH MATRIX
Anchor → control → TX/RX → antenna
5G FAILURE MATRIX
Problem → Evidence → Next proof
| 5G Problem | Primary Evidence | Likely Domain | Confirmation | Repair Direction |
|---|
06 — MASTER NETWORK / BASEBAND DATABASE
Voltage + GR + resistance + signal state
Values below are preserved from the uploaded source as reference data, not universal factory specifications for every phone.
| Section | Rail / Signal | Operating Voltage | GR / Diode | Resistance | Scope / Bus | Failure Evidence |
|---|
07 — LIVE RF LINE EVALUATOR
Compare one test point
Enter at least one measurement.
EVIDENCE ROUTER
Manual scan + registration + current
Combine several observations for stronger evidence.
08 — SAMSUNG HALF-FLIGHT / 5G SPECIALIST BRANCH
Shannon, RFFE, n78 and MIMO diagnostics
This section is explicitly Samsung/source-specific. Service codes and exact hardware paths can vary by model, region and firmware.
SAMSUNG / 5G FORENSICS
TARGET MEASUREMENTS
Selected case
ISOLATION WORKFLOW
Step-by-step confirmation
Use MIPI/band status as supporting evidence. A MIPI error narrows the RFFE/front-end path but does not identify the exact failed IC by itself.
NR availability/state can help distinguish network availability from a failed 5G attach/data path, but interpretation is device/firmware dependent.
If the symptom changes after disconnecting the lower board/FPC, treat that as strong isolation evidence and inspect the disconnected path before replacement.
Secondary coax and diversity paths matter for 5G reception. Verify connectors, shield continuity and LNA supplies rather than assuming a universal 4x4-MIMO rule for every implementation.
09 — RAPID RF TRIAGE
Eliminate easy causes before RF BGA work
These are confirmation-first checks derived from the uploaded sources.
SIM path
Tray detect, VSIM pulse, CLK/RST/DATA, connector corrosion and dual-SIM series components.
Modem state
Baseband/IMEI, modem core rail, RF clock and AP↔modem communication before touching PAs.
RFFE symmetry
Compare CLK/DATA and actual bus activity. A static diode mismatch is supporting evidence, not component identification.
TX power path
PA VPH, envelope-tracker output and battery/VSYS stability during registration or call load.
Antenna / coax
Center conductor, shield continuity, tuner/LNA supply and connector seating.
Wi-Fi coexistence
When Wi-Fi/BT degrades only during cellular TX, inspect coexistence signaling, shielding and 2.4GHz front-end filtering.