As a matter of fact hdmi_safe=1 implies ALL of these:
hdmi_safe=1 worked for me but the 3 metioned by @goldilocks did not.
You can try and tweak the others the same way if the first 3 don't do the trick.
The 5 for overscan parameters did nothing but give me the black bars around the image, but the
hdmi_mode I tried a ton of different values listed in the documentation (specifically here) and ended up using
hdmi_mode=5 (which is 1080i/60Hz).
Since I'm on a TV I also set