Ghosting is a symptom, not a fault. It lives in the content, in the display mode, or in the link — and the test that separates them is simply whether the doubling follows the file.
Ghosting is not a single fault, it is a symptom with three very different homes. The separating question is whether the doubling follows the content: open a second file, then a second player, and watch what changes.
If it follows one file, the pair inside that file is misaligned — usually a small vertical offset, sometimes a fraction of a degree of rotation. This is measurable in pixels, and the measurement is the proof: shift one half against the other until they agree, and the size of the shift is the defect.
If it follows every stereo file but not 2D, the suspicion moves to the display mode. Half-width side-by-side stretches each half to fill the panel, and that upscaling reads as a soft doubled edge. The mode is readable from the device — it is one of the few things the operating system genuinely cannot tell you.
If 2D text is doubled too, nothing about 3D is involved: it is the link or the panel, and stereo tools will waste your time. Check what resolution and scaling the host is delivering first.
Every verdict in the walkthrough is tagged with the layer it blames — content, settings, firmware, device, cable or host. That tag is the difference between a fix and a guess: a content defect is repaired by rewriting a file, a settings defect by changing an option, a cable defect by replacing hardware. Getting the layer wrong is what makes people reinstall drivers for a misaligned pair.
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