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Glad to hear that you got it figured out. Sorry to hear that you got bitten.
Buy some of Bob's monitor adjustment tools on your next order.![]()
Will do, and I might need a new monitor now.Had my game running in the other room like I usually do, and I suddenly heard a loud screeching sound, almost like a record being scratched. I ran into the room and unplugged the power supply as i saw no picture on the screen and saw heavy arcing in the back of the flyback area/neck.
I am literally shaking right now. I might have just lost my perfectly adjusted monitor.![]()
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You may have a bad flyback. Or you may have damaged something when you got bitten earlier tonight. My best advice: shelve it for the night. Sleep on it. Tomorrow come back when you're not so shaken up and won't be prone to make mistakes when dealing with it.
That would be hard for me to do but it's good advice.![]()
Haha. Thanks. Got to say, the adrenaline rush right now is keeping me awake. I ensured the tube was discharged (this chassis does a great job of discharging on its own, but in case i fried something I didn't want to risk it) and there were no sparks/crackles. I then took the monitor chassis out and inspected it. i don't see a single bulging/leaking/odd looking capacitor, or charred resistor, etc. The parts and solder side both look absolutely beautiful.
I then took a close look at the neck of the CRT Tube. i don't see any signs of damage there. no hairline cracks are visible, and the getter still looks silver. So I believe the tube is good.
I then tested the HOT and getting 0.490 on each side, so the HOT is good with no shorts. When I grabbed the flyback, however, i noticed that the C-shaped section of it that merges with the main tube body was VERY loose. When installing it, the center part was firm and tight. Now it's basically falling apart. So this new flyback i got was a dud and is now dead. Thankfully, I don't think anything else went with it. The fuse is still good, the HOT is still good, and I think if the flyback took out anything it would be the HOT.
It's now 3:40 AM, so i'm going to head to bed and do some more testing tomorrow and remove that flyback. Will order another one, but likely won't get it until the weekend, or early next week. At least it's super easy to install the flyback on these chassis. Will also get a chance to test the HOT out of circuit as I need to remove the bracket it's attached to and it soldered into the board in order to get the flyback out.
So right now, i think I'm good and still have a monitor to use. it's just the flyback I got was apparently a complete dud, and finally just crapped out on me.
I got the flyback from Twisted Quarter. Again, I don't blame them or put any fault on them as there are just times where a part fails during mass production that isn't picked up until later.
Anyway, I tested everything on the board, and the only issue is indeed the flyback, so that's a huge relief.
Just wish it didn't go on me as i just got my blank EPROMs to upgrade the version on the game PCB and wanted to see the end result of my work. I was able to just play the game blind, however, and could hear it start up so at least i know it works. Heh.
It's going to look beautiful when you're done. You just need to be patient a little while longer.![]()
Thank you OP! I finally improved the convergence on my Donkey Kong Junior after all these years. It's not perfect, but it's evened out and looks pretty good in a photo!
Wade
Wow, Wade, it's been forever since I've seen you around here. Good to see you and glad you tweaked your monitor's convergence!
I finally worked up the nerve and converged my G08 last year and it really helped a lot. It's not perfect but it's much better and I can live with that.
Thanks. I lurk off and on, search the for sale ads, look for tips on fixing issues as they come up, etc. Lately I've been checking in a few times a week. Just doing some minor tinkering here and there.
The Blue on my Mario Bros is a little off around the edges, so I might try it soon since the DK JR went pretty well. Annoying that there's no test pattern on Nintendo games!
Wade
Thanks. I lurk off and on, search the for sale ads, look for tips on fixing issues as they come up, etc. Lately I've been checking in a few times a week. Just doing some minor tinkering here and there.
The Blue on my Mario Bros is a little off around the edges, so I might try it soon since the DK JR went pretty well. Annoying that there's no test pattern on Nintendo games!
Wade
I've used this thread a lot over the years, it's been very useful
So the go7 in my Ms. Pac has a rotated screen, it's rotated probably 10 or 15 degrees. I understand that this is a yoke issue, and that I need to rotate it back so that the picture is straight again.
My question is will this mess up the convergence? It is beautifully converged as it is, and if rotating the yoke will mess with that, I won't do it, but I'd like to get it dialed in.