Nintendo playchoice monitor color issue

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Hello,

Just bought a nintendo playchoice arcade game with a sharp 4f monitor. I can't seem to get the colors on the screen to come out right no matter what pot settings I have. And ideas on what could be causing this? It almost looks like a contrast issue or something but I can't find the adjustment for that.
 

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So I can adjust the red until the whole screen goes red, but red does seem to be missing from the characters.
 
I've had this on a k7000. Before you chase your tail make sure your input color amp xisistors are good. Make sure your red is making contact from the pcb to the screen and you can double check this if you have a dk or something. Its not the neckboard xisistors but the input side I've never worked on a sharp but the principal is the same.
 
I have no idea as I've never even really seen a sharp f4 but the principal from what you're describing is the same.
 
if its any transistors its likely in this area those little guys are cheap and you can get them at radio shack most likely



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if you're seeing red when you turn the red adjustment up, obviously it's nothing in the monitor circuitry. you will need to focus your attention on the signal. this could either be a bad wire for the red signal, or the header on the chassis has cracked solder joints.

the Sanyo Z2AW monitors come with the additional inverter boards even though they're not needed. I've seen this happen a lot where it's a bad solder joint on the inverter board that causes a color (or more) to drop out -- in which case I do away with plugging in through that board and just run the signal directly to the chassis instead.

you may not have this with a Sharp. if you have a very small flathead you should be able to press on the locks for the pins to the monitor signal plug -- I would swap red with green or blue and see if one of the following scenarios happens: if you get red back but lose green or blue, it's a problem with the wiring coming from the board to the monitor. otherwise, if you lose red but have green and blue signals, then you know it's the header on the chassis at fault. (be mindful your "red" colors will show up on either of the replacement colors, so it might look weird :) )
 
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