What is the most likely issue if a newly replaced laptop screen only shows a faint image?

The most likely issue when a newly replaced laptop screen only shows a faint image is that a cable was left disconnected. During the replacement process, it's common for cables that connect the screen to the motherboard to be accidentally left unplugged or not firmly connected. These cables are essential for transmitting power and video signals to the screen. If they are not properly connected, the screen may receive insufficient power or signal, leading to a faint display.

While it's possible for the screen itself to be defective, if the replacement was done correctly and the screen was functioning prior to installation, a disconnected cable remains a more likely issue. Malfunctioning laptops can produce a variety of symptoms, but in this specific scenario where a new part is involved, it tends to point toward installation errors such as a loose or disconnected cable. Lastly, while incorrect brightness settings can affect how bright or faint an image appears, it would not typically cause the screen to display only a faint image without any presence of detail. Since this situation arises immediately after the replacement, the cable connection is the most logical root cause to consider.