LG 24MP40A Owner's Manual page 30

HDMI Timing (Video)
factory support mode
Horizontal frequency(kHz)
(Preset Mode)
480P
576P
720P
720P
1080P
1080P
30
Vertical frequency(Hz)
31.50 60
31.25 50
37.50 50
45.00 60
56.25 50
67.50 60
HDMI
O
O
O
O
O
O
recommend Mode