Yes I can confirm that pretty much any DVD burner will work fine (electrically) in a Philips DVDR520H/05 recorder.
Some people seem to be quick to comment in this thread on a system they clearly have no experience of - the issue is that the native LiteOn drive has non-standard mounting points compared with a standard PC drive, as the last poster said.
Anyway, I too have one of these sad Philips recorders and and the DVD burner no longer writes DVDs (it has maybe burned only 100 in its life), so I will never buy anything from Philips again.
The problem that still remains is that I need to identify a bare-bones burner that can be purchased that uses the same mountings system.
Does anyone know of a drive that'll fit?