This is most likely caused by an internal light leak, not the sensor “seeing” the PCB normally. In your case, the community found that a small plastic locating pin in the lens mount had fallen out, leaving a tiny hole behind the lens/sensor assembly. Light entering through that hole created the ghostly board pattern.

A practical fix is to inspect the webcam body and lens mount for any cracks, gaps, or missing plastic pieces that could let light in. If you find a small opening, covering it with opaque black insulating tape can stop the artifact. If there’s external casing damage, black tape over the leak may also help.

So: this is potentially fixable if the issue is a light leak. If the housing or internal mount is damaged beyond a simple patch, replacement may be more sensible than a major repair.