5.5 - Troubleshooting Mobile Devices Flashcards
1
Q
Poor battery health
A
- Replace aging battery
– There’s only so many recharges - Bad reception
– Always searching for signal
– Airplane mode on the ground - Disable unnecessary features
– 802.11 wireless, Bluetooth, GPS - Check application battery usage
– iOS and iPadOS: Settings/Battery
– Android: Settings/Battery
2
Q
Swollen battery
A
- Buildup of gas
– Designed to self-contain
– Do NOT open the battery packet/container
– Significant fire risk
– You’ll be sorry - Faulty battery
– Stop using immediately
– Dispose of properly - Device can be damaged
– Better than having a fire
3
Q
Broken screen
A
- Time for a backup - Do this first!
- Replace the screen - No easy fixes
- The glass is sharp
– Screen protectors can help
– Use clear tape until repaired
4
Q
Improper charging
A
- Check everything in the charging process
– Cables, interfaces - Check the cable interface
– Remove any obstructions - Check the cable
– Don’t use frayed or damaged cables
– Try a known-good cable - Verify the power adapter
– Check with a multimeter
5
Q
Poor or no connectivity
A
- Cellular or Wi-Fi
– Location, location, location - Cellular
– Signal strength
– Location matters
– Outdoor connectivity may be better - Wi-Fi
– Limited range
– Interference can limit throughput
– May need a channel/frequency configuration change
6
Q
Liquid damage
A
- Many phones have a Liquid Contact Indicator (LCI)
– Turns color when liquid has been present - Power down the phone
– Don’t power it back on. Don’t do it. - Remove the case, cards, back, and battery
– If possible - Putting the phone in a bag of rice doesn’t
actually work very well
– Silica gel is better - Leave it alone
– Don’t turn it on
– Do not charge the phone
– Don’t connect it to power
– Don’t press any keys
– Don’t heat the phone
– Don’t move it around - Wait at least a day
– Or until the phone appears to be dry
– And then perhaps a few hours after that - Once you’re sure, power it on
– Hope for the best
7
Q
Overheating
A
- Phone will automatically shut down
– Avoid overheating damage - Charging/discharging the battery, CPU usage,
display light
– All of these create heat - Check app usage
– Some apps can use a lot of CPU - Avoid direct sunlight
– Quickly overheats
8
Q
Digitizer issues
A
- Touchscreen completely black or
not responding to input
– Screen presses do not register - Apple iOS reset
– Press power button, slide to power off,
press power button
– Hold down power button and Home|Volume
for 10 seconds - Android device restart
– Remove battery, put back in, power on
– Hold down power and volume down until restart
– Some phones have different key combinations
– Some phones do not have a key-based reset
9
Q
Physically damaged ports
A
- External interface - Charging and data transfer
- Rough handling and accidents
– Damages the interface - Not charging - Look closely
- Not modular - Requires a system board replacement
10
Q
Malware
A
- Always a concern
– Even on mobile devices
– The device type doesn’t matter - Look for symptoms
– Unusual apps, large data transfers, pop up messages,
high CPU usage, device overheating, excessive
battery use. - Try a security app or scanner
– Identify malware infections
11
Q
Cursor drift
A
- Random input or cursor moves without
touching the device
– Common on older screens - Use a touch calibration app
– Requires user input
– Touch certain areas of the screen - The system will adjust to the new calibration parameters
– No more drift