The following information was kindly contributed by our forum member Thorias.

Sometimes when X68000 is connected to LCD monitor the RGB output stops working. There is I figured out that pin 2 on the SN74ALS05AN have a bad output (both Hsync and Vsync signals go directly to the SN74ALS05AN from RGB output pin 14 and 15), it is a HEX INVERTERS WITH OPEN-COLLECTOR OUTPUTS, it is located next to the white onboard RGB connector and there is only one type of this component out of the entire mobo so you can't miss it!!!.

Bought 5 of them and at the same time a 14 pins DIP round pin socket, removed old component from mobo solder the 14 pin DIP socket (in case if something happen again easier to change out!! hope no!! :P), put brand new SN74ALS05AN, put back everything together and tadaaa picture was back on my lcd screen!! I was so happy!!

This is just to share my experience with you guys as I saw other people had a similar issue with connecting some LCD TV and having lost their RGB output.

On Compact XVI models, the sync inverter is IC118 (a 74ALS04), located on the back of the motherboard.