TheBasement
Well-known member
The K7000 medium resolution monitor in my Paperboy was missing the red recently. Usually it would come back in a few minutes but this time it wouldn't come back. I had this issue with a G07 in the past and it was a cold solder joint. I pulled the chassis, and hit every solder joint that used the red color input with a soldering iron. I did this at the input connector, and from the lines on the main chassis to the neckboard, at the input on the neckboard, and every red pot and transistor on the neckboard. I did this and got red back, but it isn't quite "perfect". When I turn up either the red drive or red cutoff it saturates the black area of the screen with red pixels, giving it a reddish tint. However, I have to turn it down for a proper black level.
Again, red shows up on the monitor, it just seems weak. I hit every joint with a soldering iron again but it is the same weak red color. Turning down all green or blue pots does not make the red "pop out" anymore.
I know I should leave well enough alone, but I will spend 30 minutes on a machine perfecting the color and brightness, so this is just bugging me that I can't "adjust" it out. Will the red transistor on the neck board cause this, or is there a weak resistor that needs to be replaced other than the pot? Again, the pots will adjust the red color, they just aren't as bright as the red and green. I know someone might suggest the red gun might be going bad, but if thats the case then a soldering iron should not have brought the signal back.
A scan from the manual shows a 6.8K resistor pulled to ground from the transistor, and a 2.7K resistor going to the gun. Could one of those cause a weak color?
Thank you for any help. Replacement medium res monitors aren't a cheap or easy thing to locate, so I'd like to get this one in tip top shape.
Again, red shows up on the monitor, it just seems weak. I hit every joint with a soldering iron again but it is the same weak red color. Turning down all green or blue pots does not make the red "pop out" anymore.
I know I should leave well enough alone, but I will spend 30 minutes on a machine perfecting the color and brightness, so this is just bugging me that I can't "adjust" it out. Will the red transistor on the neck board cause this, or is there a weak resistor that needs to be replaced other than the pot? Again, the pots will adjust the red color, they just aren't as bright as the red and green. I know someone might suggest the red gun might be going bad, but if thats the case then a soldering iron should not have brought the signal back.
A scan from the manual shows a 6.8K resistor pulled to ground from the transistor, and a 2.7K resistor going to the gun. Could one of those cause a weak color?
Thank you for any help. Replacement medium res monitors aren't a cheap or easy thing to locate, so I'd like to get this one in tip top shape.
Last edited: