5.5 Given a scenario, troubleshoot common issues with mobile devices Flashcards
What might it mean if a device won’t turn on but has a known good battery?
Power circuitry might be faulty
What may cause a device’s battery to go on fire or explode?
Incorrect charger or extreme heat exposure
Be cautious when leaving batteries to recharge unattended. Do not leave a battery charger close to flammable material & ensure there is plenty of ventilation around the unit
2 things that greatly reduces a Li-ion battery life?
- Regularly fully discharging it
- Persistently keeping it at 100%
Short battery life may indicate an aging battery that needs replacement. If the battery is not old or faulty, an app may be draining the battery excessively. Use a battery utilization app to investigate.
What does a swollen battery indicate?
A problem with the battery’s charging circuit
Which is supposed to prevent overcharing. If a devie is exposed to liquid, this could also have damage the battery
Why are Li-ion batteries designed to swell?
To avoid bursting or exploding
A swollen battery is a fire hazard and can leak hazardous chemicals. Avoid skin or eye contact. Contact the manufacturer if the battery can’t be safely removed. Seek disposal advice from the manufacturer. Do not discard a swollen battery at standard recycling points unless permitted by the facility.
What visible signs may occur if a device is exposed to liquid damage?
Screen might display graphics artefacts or not show an image
What to do if you suspect a device is exposed to liquid damage?
Turn off device & dry as much excess liquid as possible
If you suspect that the internal comonents have been exposed, disassemble the device to fully dry. The battery will usually need to be replaced
What can damage the external ports of a mobile device?
Improper insertion & removal of connectors
What might be the problem if a touchscreen is not responding?
Problem could be with the digitizer
When diagnosing an unresoponsive touchscreen, what should be clean & dry?
Fingers & touchscreen
When diagnosing an unresponsive touchscreen, what should you do if it has a screen protector?
Ensure it’s securely adhered without bubbles or lifts
When diagnosing an unresponsive touchscreen, why should you try using the device in a different location?
EMI might be affecting the operation of the digitizer
When diagnosing an unresponsive touchscreen, what should you do if the device was recently serviced?
Ensure all wires are correctly connected for digitizer to work
What might be the reason if a laptop has pointer drift while typing
i.e. the mouse moves across the screen
Touchpad may have high sensitivity
What should you do first if you encounter issues with the touchpad sensitivity?
Install up-to-date drivers & configure the input options
How can you temporarily disable the touchpad on many laptops?
Via Fn key
What may cause unresponsive or inaccurate touch input in a laptop?
Insufficient system resources
i.e. having too many open apps or badly written apps that hog memory or other resources
What is a short-term solution for unresponsive or inaccurate touch input on a laptop?
Performing a soft reset
If the problem persists, free up storage space, & consider using re-calibration utilities If the problem continues, look into warranty repair
What tools are available on Windows & some Android versions for touch input issues?
Re-calibration utilities
What should you check first if Wi-Fi or Bluetooth is not working on a mobile device?
Verify adapter is enabled & if airplane mode is off
What might be the issue if wireless functions stopped working after a laptop was serviced?
Antenna might be wrongly connected
How can you fix Wi-Fi or Bluetooth issues after a device wakes from hibernate or sleep mode?
Cycle the power on the device, reconnect it, & check for updated drivers
What can you do to resolve intermittent connectivity issues with Wi-Fi or Bluetooth?
- Move devices closer
- Change their positions
- Use Wi-Fi analyzer
Use a Wi-Fi analyzer to measure signal strength and identify interference sources. Similar utilities can analyze cellular signals.
How can certain hand positions affect a mobile device’s connectivity?
By interfering with the antenna’s performance
What should you do if your device unexpectedly reaches its data transmission limit?
Check each app’s data usage for suspicious activity
How to tell if malware is trying to use a device’s camera?
Checking if camera LED is activated
6 common signs of a device infected with malware?
- Unresponsive apps
- Excessive power drain
- High resource use
- Overheating
- Unexpected data usage
- Unauthorized camera/mic use
