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Some users are seeing small mismatches in VCOM values (e.g. -1362 mV in software compared to -1.37 printed on the display cable). The software is displaying a rounded value, and sometimes latching to a predetermined "expected" result. So, even if it looks like they're off by a little, they actually do match—nothing to worry about!
All Kobo displays come pre-calibrated—so, even if it might seem like the software and printed VCOM numbers don't match to the exact digit, it's still working as designed under the hood. Additionally, even if the displays ''were'' off by a few mV, that small of a mismatch isn't stark enough to cause display damage.[br]
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Hope this helps!