TheBasement
Well-known member
I have a Paperboy that the red seems to keep flaking out (sometimes red works, sometimes not). The red is not completely missing, but very low, very dull. At first I thought this was a monitor issue, caps, pots, etc. I put up a color test signal from the Paperboy board and swapped red and green video wires and I'm getting a vibrant red on the monitor, so this is not a monitor issue. Also, I measured the voltage coming off of the Paperboy video board (with the monitor connector pulled) and the voltage is considerably lower than the green and blue voltage from the Paperboy video board. This is definitely a Paperboy video board issue, not a monitor issue. For some reason the red video voltage is just lower than the rest. I can crank up the red pot on the monitor and the reds show but are mostly muddled, not like they should be. Because of the lower red video voltage coming off the Paperboy board the monitor just don't have much signal to work with.
On the Paperboy video board I have taken a soldering iron and reflowed the video connector, tried to trace the red signal and reflowed several resistors, transistors, etc with no change. I pulled several resistors along the red video path and measured the resistance and they appear just fine. I would hate to have to buy an entire another expensive Paperboy video board, since I have basic troubleshooting skils. Any idea which chip, transistor, etc might be the problem and that I can swap?
On the Paperboy video board I have taken a soldering iron and reflowed the video connector, tried to trace the red signal and reflowed several resistors, transistors, etc with no change. I pulled several resistors along the red video path and measured the resistance and they appear just fine. I would hate to have to buy an entire another expensive Paperboy video board, since I have basic troubleshooting skils. Any idea which chip, transistor, etc might be the problem and that I can swap?