A crimper is a tool that is used to attach connectors to network cables, such as RJ-45 or RJ-11. A technician might need a crimper to create a longer cable for the router access point or to replace a damaged connector.
A Wi-Fi analyzer is a software or hardware tool that can scan and measure the wireless signal strength, interference, channel usage, and security of a Wi-Fi network. A technician might need a Wi-Fi analyzer to find the optimal location and configuration for the router access point to improve the signal coverage for the SOHO client.
Reference
* [CompTIA A+ Core 1 (220-1001) Certification Study Guide], page 77
* [CompTIA A+ Core 1 (220-1001) Certification Study Guide], page 82
* [What is a Crimper?]
* [What is a Wi-Fi Analyzer?]

The most likely cause of the issue is a defective inverter. An inverter is a device that converts the direct current (DC) power from the laptop battery or adapter to the alternating current (AC) power that the LCD backlight bulb needs. The backlight bulb is a fluorescent lamp that illuminates the LCD screen and makes the image visible. If the inverter is defective, it may not provide enough power to the backlight bulb, or it may stop working intermittently. This can result in a dim, dark, or blank screen, even though the LCD panel is still functioning and displaying a faint image.
To troubleshoot a defective inverter, the technician can follow these steps:
Connect an external monitor to the laptop and check if the image is displayed normally. If the external monitor works fine, it means that the laptop video card and driver are not the cause of the issue.
Shine a flashlight into the LCD screen and look for a faint image. If the image is visible, it means that the LCD panel is not the cause of the issue.
Check the inverter cable and connector for any damage, loose connection, or corrosion. The inverter cable is a thin wire that runs from the laptop motherboard to the inverter board, which is usually located at the bottom of the LCD screen. The inverter connector is a small plug that connects the inverter cable to the inverter board. The technician can try to reseat the inverter cable and connector, or replace them if they are faulty.
Check the inverter board for any damage, burn marks, or blown fuses. The inverter board is a small circuit board that contains the inverter and other components. The technician can try to test the inverter board with a multimeter, or replace it if it is defective.
Reference:
How to fix laptop screen flickering problem - Windows 101
How to Fix a Laptop Screen That's Flickering, Black, or Has Lines2
How to Fix a Dim Laptop Screen | Techwalla3
How to Test a Laptop Inverter | It Still Works4
How to Replace a Laptop Inverter Board | Chron.com5

An MX (Mail Exchange) record in DNS specifies the mail server responsible for accepting email messages on behalf of a domain. It is a vital component of the email delivery process, directing email to the correct server based on the domain part of the email address. Without properly configured MX records, a domain's email system cannot function correctly.

Explanation
High availability is a design principle that ensures a system or service can operate continuously without significant downtime or disruption. High availability can be achieved by implementing redundancy, failover, load balancing, and backup strategies. High availability can prevent a single point of failure within the system, which means that if one component fails, another one can take over its function. Rapid elasticity is the ability to scale up or down the resources of a system according to the demand, but it does not prevent a single point of failure. RAID is a method of storing data across multiple disks to provide redundancy and performance, but it does not prevent a single point of failure at the server level. Shared resources are the resources that are pooled and accessed by multiple users or systems, but they do not prevent a single point of failure either. References:
https://www.comptia.org/blog/what-is-cloud-computing