The standard RGB to SVGA adapter is a simple wiring adapter. For it to work with ANY SVGA monitor you must be running in a 31KHz mode. i.e. doubldouble NTSC.
In workbench DEVS/monitors you need to have the "double ntsc" icon (it might should be in devs/storage, move it) once you've done that you can go to prefs->screenmode and select double ntsc and plug into a SVGA LCD screen.
Note: Games wont work in double ntsc... only workbench
Your Amiga will be slow unless you have an accelerator
Double PAL wont work as it's 50Hz and most LCDs only sync as low as 60Hz