Matt fucking rocks! He just fixed an issue with my K4915 chassis, took him about 5 seconds to fix. The man is a genius! Can't thank him enough for all the amazing help he provides the community!
That K4915... ugh...
Kaydee and I were working on that one. It has a fun story.
It had been necked, so its a tube swap with a jumper-fixed neckboard. ss02049 recapped it at a repair party, and the top half of the screen was collapsed, kinda like vector monitors do when one of the transistors is failing... so we find one of the vertical deflection transistors (the pair on the big pair of cooling fins) has a leg broken off. Swap that out, and now we go into immediate shutdown, with a resistor glowing orange after about 30 seconds, a different one depending on where the hpos jumper is set... so something must be shorting to ground.
We eventually find the cause of that, this board has jumper wires all over it, one had broken off and was touching the frame. We fix that and the monitor comes up again. Victory, we thought, because this was outside at a repair party and it was too bright outside to dial everything in, so we took it home to work on it the next day...
Then we find that the image was bright on the left, and got darker as we moved to the right... we started testing caps, continuity in various areas, etc. No dice and no change. Exchanged several texts with gamefixer as he shared some ideas to try. Once he got the chassis in his hands he was able to find and fix it quickly.
Kaydee and I are really grateful for the help and the willingness to help on Gamefixer's part! We are a couple of software geeks who really only started fixing this kind of stuff a couple of years ago... we've brought G07s, 4600s, 4900s, Tovis, G05, G08, Sharp 2001XM, WG6100s back from the dead or near dead, and have built a few "new" monitors (a 4900, G07, Tovis and 7000) from found TVs, yokes scrounged from necked tubes or eBay, and rebuilt parts chassis from a box of junk

But we aren't EEs or anything like that, its all self taught from the 'net -- so we are super appreciative of experts like Gamefixer who will share what they know with us so we can use it to help the next person at the next repair party get one of their old games up and running.
There is my super long way of saying "Thank's Gamefixer, we owe you a beer or seven at Zapcon"
--O