In the past, it was easy to hook up a QL or compatible computer to a multisync CRT monitor that could display both interlaced and non-interlaced resolutions... The NEC Multisync 3D was such a monitor.
Nowadays, alas, LCD VGA monitors cannot sync old computer resolutions, be them interlaced (and more or less compatible with TVs still bearing a SCART/PERITEL input, which became a rarity as well), or VGA-like (such as the Q40/Q60 and its weird 1024x512 resolution).
After trying several VGA scan converters that pretended to do the job, but that only have proven to be a total waste of time and money, I finally found the Open Source Scan Converter (v1.6), and bought one (the Kaiko build). I can happily vouch for the fact this scan converter plain works, and beautifully at that ! Below are photos I took of the screen of a Hyundai W220D LCD monitor to which the OSSC was connected, with a QL, a Thor XVI and a Q60 on the other end.
QL running the QEP III EPROM programmer (in MODE 4, i.e. the "Monitor" mode, but MODE 8 (AKA "TV" mode) also works, of course):
Thor XVI (boot screen, and running ACP):
Q60:
And here are the settings I am using with my Q60, Aurora, Thor XVI and QL: OSSC.txt (the Q60 settings have even been further improved when compared to the image above: the picture is now pixel-perfect on my monitor).