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ERROR_MONITOR_INVALID_SERIAL_NUMBER_MONDSC_BLOCK
ERROR_MONITOR_INVALID_SERIAL_NUMBER_MONDSC_BLOCK concerns the optional text serial-number descriptor inside the 18-byte EDID descriptor area. It is not the same field as the four-byte numeric product serial number in the Vendor and Product ID section.
What a valid detailed serial descriptor looks like
In EDID 1.4, the display product serial-number descriptor uses tag FFh and can hold up to 13 ASCII characters. A shorter string is terminated with line feed and the remaining bytes are padded with spaces. A wrong tag, malformed prefix, unsuitable text layout, or inconsistent length can therefore fail descriptor validation.
Practical implication
Do not use the Windows display path or a device-manager label as a substitute for this field. Preserve the raw block, then distinguish the numeric serial bytes from the optional text descriptor before deciding whether an EDID override is needed.
VESA: product serial number field and tag FFh descriptor
Microsoft: monitor identification data derived from E-EDID
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