Perhaps try this?
Section "Monitor" Identifier "TV" Option "Ignore" "True" EndSection
Section "Device" Identifier "MonitorTV" Option "monitor-TV" "TV" EndSection
Perhaps try this?
Section "Monitor"
Identifier "TV"
Option "Ignore" "True"
EndSection
Section "Device"
Identifier "MonitorTV"
Option "monitor-TV" "TV"
EndSection