I used these settings and pin outs below with good results:
HPOS 56
VPOS 16
HSIZE 48
VSIZE 55
CLAMP ST 97
CLAMP SD 00
or
HPOS 50
VPOS 14
HSIZE 50
VSIZE 56
CLAMP ST 97
CLAMP SD 00
These settings work in
PAL and NTSC.
Good luck.
The converter is labeled pretty good
All pins are on Amiga side:
PIN 3 RED
PIN 4 GREEN
PIN 5 BLUE
PIN 10 CSYNC
PIN 19 GND
Edit: one more thing, if things don't work, press the "Auto" button, to find the signal.