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I have this amber TTL monitor that seems to be defective-not working, has no burn in at all so must be low hour

I only get power LED when turning ona nd heaters but nothing else, now at first I thought uit was just waiting for signal but after trying multiple 8bit Hercules video-cards I am starting to suspect the monitor might have a fault in it.
I have no other monitor to verify that indeed it could be the monitor but am very sure it is

The monitor has 3 IC a TDA2593,TDA1170N and a 74LS136W which I suspect might be the problem, but how can I verify that indeed the monitor is at fault here

now common problems with these TTL is that someone might've connected it to some unwanted signals like a VGA
and I heard that might damage the monitor, is that true and it probably fried the LS74136 right ??

Can I use a arduino to simulate a TTL signal to input into this thing to test it ?