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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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