compact design of mobile devices makes them vulnerable to overheating
bottom surface of a laptop becomes hot when improperly ventilated
Laptop cooling (or chiller) pads are designed to sit under the laptop to maximize airflow and protect a user from getting a burn from a device overheating
Dust trapped in vents acts as an insulator and can prevent proper cooling
Handheld devices use passive cooling
can become quite warm when used intensively
High screen brightness and use of the flashlight function will rapidly increase heat
will start to overheat quickly when exposed to direct sunlight
have protective circuitry that will initiate a shut down if the internal temperature is at the maximum safe limit
can also use an app to monitor the battery temperature
approaching 40⁰C is getting too warm
Liquid Damage Symptoms
Some mobile-device cases provide a degree of waterproofing
Waterproofing is rated on the Ingress Protection (IP) scale
will have two numbers
E.g., IP67
first (6) is a rating for repelling solids
5 = dust protected
6 = dust proof
X = dust protection unrated
second value (7) is for liquids
7 = protected from immersion in up to 1 m
8 = protected from immersion beyond 1 m
liquid damage
may be visible signs of water under the screen
screen might display graphics artifacts or not show an image
power off the device immediately if you suspect liquid damage
Dry as much excess liquid as possible
if liquid got inside, device must be disassembled to fully dry
Once dry, clean the circuit boards and contacts
battery will usually need to be replaced
Physically Damaged Port Symptoms
connector may be loose or may no longer fit
may be no data connection at all, or it might be intermittent