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Here's a list of monitors that I have found that WILL NOT WORK with a buffered VGA adapter and an Amiga 500 ntsc:
3M DMS 710 Projector (input not supported on a500 ntsc, will work on component with rgbs/vga to ypbpr adapter but picture slightly unstable)
Acer P206HL (doesn't work with 15khz tester)
Acer V226HQL (doesn't work with 15khz tester)
Acer V246HQL (doesn't work with a500 ntsc)
Acer V203HL (doesn't work with a500 ntsc)
Acer A231H (doesn't work with a500 ntsc)
AOC e2460 (doesn't work with a500 ntsc)AOC 2036S (doesn't work with a500 ntsc)
AOC 416Va (doesn't work with 15khz tester)
Asus VE278H (doesn't work with 15khz tester)Benq XL2730Z (doesn't work with a500 ntsc, monitor says Cable not connected)Dell U2412Mb (doesn't work with a500 ntsc, I have two of these and neither works)
Asus VE247 (doesn't work with 15khz tester)
Asus VW246 (doesn't work with 15khz tester)
Asus VS197 (doesn't work with a500 ntsc)
Asus VS228 (doesn't work with 15khz tester)
Asus VS238H (doesn't work with 15khz tester)
Asus VS247H-P (doesn't work with 15khz tester)
Asus VX238H (doesn't work with 15khz tester)
Benq GW2765 (doesn't work with a500 ntsc)
Dell E193FP (doesn't work with 15khz tester)
Dell E1913c (doesn't work with 15khz tester)
Dell E2014H (doesn't work with 15khz tester)
Dell E2020H (doesn't work with 15khz tester)
Dell E2011H (doesn't work with 15khz tester)
Dell E2210 (doesn't work with 15khz tester)
Dell E2216HV (doesn't work with 15khz tester)
Dell E2211Hc (doesn't work with 15khz tester)
Dell E2213c (doesn't work with a500 ntsc, note that the E2213Hb does work)
Dell P2213f (doesn't work with a500 ntsc)
Dell E2715 (doesn't work with 15khz tester)
Dell E2318H (doesn't work with 15khz tester)
Dell 1907FPt (doesn't work with a500 ntsc)
Dell 1908FP (doesn't work with 15khz tester)
Dell P1913S (doesn't work with 15khz tester)
Dell P1914S (doesn't work with 15khz tester)
Dell P2014H (doesn't work with 15khz tester)
Dell P2211Ht (doesn't work with 15khz tester)
Dell P2311H (doesn't work with a500 ntsc)
Dell P2312Ht (doesn't work with 15khz tester)
Dell P2319 (doesn't work with a500 ntsc)
Dell P2217H (doesn't work with a500 ntsc)
Dell P2317H (doesn't work with 15khz tester)
Dell P2418Ht (doesn't work with a500 ntsc)
Dell P2419H (doesn't work with 15khz tester) (I have since found a couple of P2419H that do work, so maybe it depends on the unit)
Dell P2411Hb (doesn't work with 15khz tester)
Dell 2407FP (doesn't work with a500 ntsc on VGA input, component video supports Amiga 500 ntsc with RGBS/VGA to YPbPr adapter)
Dell 2408FP (doesn't work with a500 ntsc on VGA input, component video supports Amiga 500 ntsc with RGBS/VGA to YPbPr adapter)
Dell S2240M (will work with a500 interlace but not normal non interlace 15khz)
Dell 2007FP (VGA Amiga 15khz unsupported, but has a composite input that will
display a500 monochrome composite video out)
Dell SE2417HG (doesn't work with 15khz tester)
Dell SE2419HX (doesn't work with 15khz tester)
Dell SE2422HX SE2422Hb (doesn't work with 15khz tester)
Dell SP2208WPf (doesn't work with 15khz tester)
Dell P2213 (only interlace mode works and jittery, non interlace not supported)
Dell E1909W (doesn't work with a500 ntsc)
Dell U3011 (non interlace looks very dark, like macrovision. However, it will display interlaced fine, but image is soft. It detects non-interlace NTSC as 720x288@60 and displays garbage at the bottom. If you set the colors to YPbPr you can actually see the screen but the colors are all wrong. It detects interlace as 480i. The same pattern is repeated on the Component input: dark colors on non-interlace but interlace is fine but soft.)
Dell U2713Hm (doesn't work with 15khz tester)
Dell IN2010 (doesn't work with 15khz tester)
Eizo Flexscan EV2456 (doesn't work with a500 ntsc)
Gateway FPD2185W (get a decent a500 screen display with VGA but colors are completely wrong)
Hanns-G HH241 (doesn't work with a500 ntsc)
HP EliteDisplay E221 (doesn't work with 15khz tester)
HP EliteDisplay E231 (doesn't work with 15khz tester)
HP w2207 (doesn't work with 15khz tester)
HP w2071d (doesn't work with a500 ntsc)
HP V21 (doesn't work with a500 ntsc)
HP V222vb (will show the 15.7 khz screen, with an overlay that says out of range and the screen will shut off in 30s, pressing the button gives another 30s)
HP VH240a (doesn't work with 15khz tester)
HP 2509m (doesn't work with a500 ntsc)
HP LP2465 (doesn't work with a500 ntsc)
HP w2408 (doesn't work with a500 ntsc on vga input)
LG E2241V-BN (doesn't work with a500 ntsc)
LG Flatron IPS234W (doesn't work with 15khz tester)
NEC Multisync LCD1850E (doesn't work with a500 ntsc)
Samsung S22E450D (doesn't work with 15khz tester)
Samsung S24E450D (doesn't work with a500 ntsc)Samsung S27E450D (doesn't work with a500 ntsc)
Samsung C27F391FHN (doesn't work with a500 ntsc)
Samsung E1920X (doesn't work with a500 ntsc)
Samsung 173T (doesn't work with a500 ntsc)
Samsung Syncmaster 2253LW (doesn't work with 15khz tester)
Viewsonic VA2012 (doesn't work with 15khz tester)
Viewsonic VA2246M-LED (doesn't work with 15khz tester)
Viewsonie VA2446M-LED (doesn't work with 15khz tester)
Viewsonic VA2248M-LED (doesn't work with 15khz tester)
Viewsonic VA2448M-LED (doesn't work with 15khz tester)
Viewsonic VX2250 (doesn't work with 15khz tester)
Viewsonic VX2433 (doesn't work with 15khz tester)
Viewsonic VX2450WM-LED (doesn't work with 15khz tester)
Viewsonic PJ503D Projector (will display 15khz non interlaced Amiga but clips off right 15% of screen with no way to adjust, interlace displays scrambled, will display a500 composite video with no issues)
I'll update this page as I find my various notes and test different monitors.