Since my old original power supply has a loose connection after 3 years of intensive mobile use, I ordered the power supply offered by CHARGER4U for my 3810TZ. It is displayed as an original power supply of Acer / LiteON. Included is the usual practical Velcro for ordinary tying cable clutter. The only difference from my original: significantly shorter Mickey Mouse connection cable (75cm), with angled plug. This can indeed replace if necessary, insofar as no deficit. (On the low voltage side is the length but as usual 180cm). Function of the power supply properly. The delivery (only slight criticism: without padding) in a small carton in a plastic bag via DPD Express pak from UK, within 6 days.
UPDATE: After 3 days use the power supply worked only sporadically, on a complaint by e-mail I got a replacement PSU sent (but not more original!). Somewhat questionable, but it works perfectly since then (and I like the green light on this power supply). For ~ 15 euros definitely okay.