nerdygrrl
Well-known member
So I have read most of the threads on here re missing red, but just wanted to ask some things here based on my symptoms to try and narrow things down a bit.
I picked up a Neo Geo w/K7000. When I fired it up the red was a low/missing I gave the pot a little turn from side to side and it came back on and I had no problems for months until I adjusted the neckboard again.
I just assumed the pots were dirty and went ahead and replaced them all with new pots to avoid the issues that arise with these. I just rebuilt the chassis (caps,HOT, fly..) when I did that I ordered up a new transistor for the red just as a precaution because they seem prone to failure.
With everything installed, I fired up the monitor, no red. Turned it off, turned it back on and boom red. Ran it for ten minutes as I was trying to get everything adjusted and the red disappeared again after several minutes.
While I originally thought this was a dirty pot or bad solder joint on the pot, I feel like what I have done has ruled that out.
The fact that it is intermittent seems to rule out a bad trace or transistor.
I've heard that a bad tube can cause this, but I am not sure what the symptoms would be. This seems to go in and out.
Any thoughts?
I picked up a Neo Geo w/K7000. When I fired it up the red was a low/missing I gave the pot a little turn from side to side and it came back on and I had no problems for months until I adjusted the neckboard again.
I just assumed the pots were dirty and went ahead and replaced them all with new pots to avoid the issues that arise with these. I just rebuilt the chassis (caps,HOT, fly..) when I did that I ordered up a new transistor for the red just as a precaution because they seem prone to failure.
With everything installed, I fired up the monitor, no red. Turned it off, turned it back on and boom red. Ran it for ten minutes as I was trying to get everything adjusted and the red disappeared again after several minutes.
While I originally thought this was a dirty pot or bad solder joint on the pot, I feel like what I have done has ruled that out.
The fact that it is intermittent seems to rule out a bad trace or transistor.
I've heard that a bad tube can cause this, but I am not sure what the symptoms would be. This seems to go in and out.
Any thoughts?
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