L8 - T8D - S2 - Hardware Failure Issues

Overheating

The compact design of mobile devices makes them vulnerable to _____

• This often happens on the bottom surface of a laptop when improperly ventilated

• Happens when laptops are put on

  • soft surfaces,  

  • on people's laps, or  

  • in places where there is not enough room between the vents and a wall

Laptop Cooling/Chiller Pads

Accessories designed to sit under the laptop to:

• Protect a user from getting a burn from a device overheating

• Maximize airflow

• Dust

  • Acts as an insulator and can prevent proper cooling

• Intensive use

• High screen brightness

• Flashlight function

• Direct sunlight exposure

Things that can cause a mobile device to overheat

• Protective circuitry

  • Initiates a shut down if the internal temperature is at the maximum safe limit

• Monitoring apps

  • Can monitor battery temperature and then compare that to the operating limits

Tools to protect a mobile phone from overheating

• Generally, approaching 40⁰C is getting too warm

True

• Waterproofing is rated on the Ingress Protection (IP) scale

True or False: Some mobile-device cases provide a degree of waterproofing

Ingress Protection (IP) scale

A rating system used to evaluate waterproofing

• A case or device will have two numbers, such as IP67

  • First number — Rating for repelling solids

    • 5/6 = Dust protected/dust proof

  • Second number — Rating for repelling liquids

    • 7/8 = Immersion up to 1m/Immersion beyond 1m

• If dust protection is unrated, the IP value will be IPX7 or IPX8 

• Visible signs of water under the screen

• Screen might display graphics artifacts or not show an image

Symptoms of liquid damage

• Turn the power off immediately

• Dry as much excess liquid as possible

• If you think internal components are wet, the device must be disassembled to fully dry

  • Once dry, clean the circuit boards and contacts

  • Battery will usually need to be replaced

What to do if you suspect liquid damage to a phone

• Connector may be loose or may no longer fit

• May be no data connection at all, or it might be intermittent

• Device may fail to charge properly

Damaged Port Symptoms

• Commonly caused by improper insertion and removal of connectors

  • Remove a connector by holding the connector and pulling it straight.

  • A connector should not be jiggled to remove it