Hi.
Sadly the power adaptor for my picopic max has broke.
How do I go about getting a replacement?
Did you try ask via the contact page:
https://support.philipsprojection.com/hc/en-us/requests/new
The manual says:
Use the supplied power adapter or a compatible USB-C 60W or higher PD-adapter. The adapter must support 15V / 3Amp or 4Amp. 20V is NOT supported.