modessitt
Volunteer: Encyclopedia Submission Moderator
Well, I just got done fixing a "Monitor Chassis From Hell" for another KLOV member. I will let him identify himself if he wishes. But I will say that he has been incredibly patient. While I told him I'm not as fast as some of the other places he could send it to (I have a day job), I am cheaper, though. Still, this was a very difficult problem, and took me about two months from start to finish.
A little background on the monitor:
This a G07, and was basically working, although it "had a wave" and was "skewed" horizontally. A cap kit, flyback, HOT, VR, Width Coil, and R908 was installed. After that the monitor was dead. F902 would blow on power up and the B+ was 0v.
Well, I get the chassis, and the first thing I notice is that the neckboard pot was backwards. Apparently, while he checked every damn cap on the chassis a hundred times for correct polarity, he forgot the neckboard one. So, I replace the cap, go over the entire chassis and fix quite a few cold solder joints, and check and find that the HOT and VR are still good and have their insulators, but that F902 is blown. I replace F902 and it powers up. I'm using the test grid from a 48-in-1 on my test bench, and I get this screen:
Hmmm. Only showing red (and red where the white squares would be). I do a bunch of voltage checks throughout the color input sections, and they are the same in the green and blue sections as the red, but it's not showing anything but red.
Continued in the next post...
A little background on the monitor:
This a G07, and was basically working, although it "had a wave" and was "skewed" horizontally. A cap kit, flyback, HOT, VR, Width Coil, and R908 was installed. After that the monitor was dead. F902 would blow on power up and the B+ was 0v.
Well, I get the chassis, and the first thing I notice is that the neckboard pot was backwards. Apparently, while he checked every damn cap on the chassis a hundred times for correct polarity, he forgot the neckboard one. So, I replace the cap, go over the entire chassis and fix quite a few cold solder joints, and check and find that the HOT and VR are still good and have their insulators, but that F902 is blown. I replace F902 and it powers up. I'm using the test grid from a 48-in-1 on my test bench, and I get this screen:
Hmmm. Only showing red (and red where the white squares would be). I do a bunch of voltage checks throughout the color input sections, and they are the same in the green and blue sections as the red, but it's not showing anything but red.
Continued in the next post...
Last edited:

