Mobile Phone STORM (Smartphone)
Service Manual
Page
16
of 38
Chapter 4: Mobile Failure Analysis
Basically, STORM main failure cases including:
Power on problem (No power on, Auto-Power on/off, Phone totally dead, Restart
automatically)
Charging problem (No charging)
Camera issue ( cannot connect camera)
Touch failure (Cannot touch, shift)
Display failure (No display, LCD backlight malfunction, Segments missing, Black display,
and Contrast malfunction)
Signal problem (No signal, Weak signal, No signal intermittent)
Other Function problem ( No ringing tone, No vibration, Vibrator abnormity, Cannot read
SIM /T-F card, Phone password locked, Cannot upgrade software, Show "high
temperature", FM Radio fault, Bluetooth issue, Wi-Fi issue, etc.)
In the mobile circuit system, all the electrical connecting trace can be divided into three types,
such as power supply trace, controlling trace and data/ signal trace. When analyzing the RF failure
case, for the active circuit we should first check the power supply, then control circuit followed by
the signal flow path to remove the failure step by step. When debugging the RF malfunction, we
should diagnose the RX part first before TX.