JoeB1355
Well-known member
So I'm working on an unknown 4900. I swapped the crt and capped it. I also swapped the neck board with another since the original was cracked
So here is the weird part.
I use my pattern generator with cross line grid and test each color one at a time
blue good
green good
red only has horizontal lines?? Its missing the vertical crossing lines
So is this weird or are there separate drive transistors for horz and vert for each color?
i only have this 1 semi working 4900 and a couple of parts chassis missing pieces and cracked to hell.
Could it even be the tube? I had to crank screen all the way up and black level to get a pic as well
Here are some pics
Blue (green looks correct like blue)
Blue & Red
Red
So here is the weird part.
I use my pattern generator with cross line grid and test each color one at a time
blue good
green good
red only has horizontal lines?? Its missing the vertical crossing lines
So is this weird or are there separate drive transistors for horz and vert for each color?
i only have this 1 semi working 4900 and a couple of parts chassis missing pieces and cracked to hell.
Could it even be the tube? I had to crank screen all the way up and black level to get a pic as well
Here are some pics
Blue (green looks correct like blue)
Blue & Red
Red
