Page 256 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Reasons for a hanging phone:
A lot of credit goes to your phone handling habits. Check some key habits that can lead to a hanging phone:
Running too many apps at the same time: Having too many applications open and running in the background
can put a strain on the phone’s resources and cause it to hang.
Leaving apps running in the background: If you don’t close apps when you’re finished using them, they will
continue to run in the background and use up resources, leading to a hanging phone.

Ignoring software updates: Keeping your phone’s software up-to-date is important because it ensures that the
device is optimized and free of bugs that can cause it to hang.
Overloading the phone with media files: Storing too many photos, videos, and other media files on your phone
can take up valuable storage space and slow down the device, leading to a hanging phone.
Using the phone while it’s charging: Using your phone while it’s charging can generate heat and cause the
device to hang.
By avoiding these habits and practicing good phone maintenance, you can help reduce the likelihood of your
phone hanging and improve its overall performance.

Study mobile phone USB charging problem:
The Universal Serial Bus (USB) connection has become the de-facto standard for both charging and data transfers
for smart phone devices including Google’s Android and Apple’s iPhone. To further enhance their functionality,
smart phones are equipped with programmable USB hardware and open source operating systems that empower
them to alter the default behavior of the end-to-end USB communications. Unfortunately, these new capabilities
coupled with the inherent trust that users place on the USB physical connectivity and the lack of any protection
mechanisms render USB a insecure link, prone to exploitation. To demonstrate this new avenue of exploitation,
we introduce novel attack strategies that exploit the functional capabilities of the USB physical link. In addition,
we detail how a sophisticated adversary who has under his control one of the connected devices can subvert the
other. This includes attacks where a compromised smart phone poses as a Human Interface Device (HID) and
sends keystrokes in order to control the victim host. Moreover, we explain how to boot a smart phone device into
USB host mode and take over another phone using a specially crafted cable. Finally, we point out the underlying
reasons behind USB exploits and propose potential defense mechanisms that would limit or even prevent such
USB borne attacks.
If you’re having issues with your removable battery charging or not holding a charge, here are some helpful tips.

Check the charging port for water damage or corrosion.
Check the charging port for bent or broken pins and lint.
Press the Power button (if available) for 3-5 seconds to verify the device doesn’t power on.
Remove then re-insert the battery, and ensure it’s charged.

Ensure a manufacturer or VZW approved battery charger (included in the box) and USB charger cable are used
to avoid extended charging times or other charging issues.
Attempt to power on the device while it’s connected to the wall charger.

For proper testing, do not use the USB cable connected to the computer or a car charger.
Verify the device and charger display the appropriate charging/LED indicator.
If the battery is extremely low, the display may remain blank for up to 5 minutes before a low battery image
appears. It may take up to 20 minutes before the device powers up.

Attempt to power on the device using an alternate manufacturer-approved charger, if available.
Mobile Phone Touch Sensor problem:
No matter whether your phone touch screen is not working due to physical damage or technical issues, here are
the ways and steps you need to follow. Here are the 11 ways to fix the phone screen not responding to touch.

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CITS : E & H - Electronics Mechanic - Lesson 130 - 145