Fried monitor after failing to reconnect ground

phaux

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I picked up a raiden 2 machine that was playing blind, monitor had no neck glow, fuse intact. It's a WG K70000. So last night I did my first recap and changed the flyback. Turned it on and much to my amazement and excitement it turned on and looked great!

Then, as I was playing with it and my friend was watching the tube it went out :( He sad it looked like static/lightning all across the back of the monitor. Then I realized I had forgotten to reconnect the green ground to chassis. So I reconnected it and changed the fuse. Now it keeps blowing fuses every time I turn it on. Anyone else had this problem or recommendations on what to start looking at?

edit: Found this post so will follow it but still, if anyone else has had this issue/insight, do tell
https://forums.arcade-museum.com/showthread.php?t=134818
 
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That's an earth ground. It's present as a safety measure & leaving it disconnected wouldn't have caused your problem. Sounds like something else failed on the monitor, I'd suspect the B+ voltage regulator and HOT.
 
For a K7000, static on the back of the tube is likely caused by the GND wire missing to the NECK BOARD, no?
 
That's an earth ground. It's present as a safety measure & leaving it disconnected wouldn't have caused your problem. Sounds like something else failed on the monitor, I'd suspect the B+ voltage regulator and HOT.

Why would it have run for 5mins or so just fine then had a discharge of sorts?

Going to test and replace the HOT and see if that fixes it. Also, forgot there's a monitor subforum here so if any mods want to move that over there, feel free :D
 
I blew a chassis once by forgetting to connect the neck GND wire.

I guess that's why they hard wired them on the K7000.

JD

For a K7000, static on the back of the tube is likely caused by the GND wire missing to the NECK BOARD, no?
 
the ground to the neckboard
is done in a way to provide deriect ground to the bell of the tube
(which would have a aboulte 0 refernce to ground)
thus allowing the foucs/grids to work right

ed
 
For a K7000, static on the back of the tube is likely caused by the GND wire missing to the NECK BOARD, no?

He specifically said "green ground," which I think would be the earth ground that clips to the frame. I think the neckboard/dag ground is always black.


Why would it have run for 5mins or so just fine then had a discharge of sorts?

Going to test and replace the HOT and see if that fixes it. Also, forgot there's a monitor subforum here so if any mods want to move that over there, feel free :D

Well, because it's 25+ years old and you have no idea what might be ready to fail next.

Just to be crystal clear, which ground did you leave off? The one between the neckboard and dag, or the one which connects to the frame of the monitor.
 
Just to be crystal clear, which ground did you leave off? The one between the neck board and dag, or the one which connects to the frame of the monitor.

The black ground wire between the monitor and the neck board was spliced back together before turning it on, it was the green ground chassis to cab wire I left off.
 
The black ground wire between the monitor and the neck board was spliced back together before turning it on, it was the green ground chassis to cab wire I left off.

Okay, that's what I thought; thanks for confirming. That wouldn't have caused your problem. Likely something else was close to failing, and failed.

Look up the K7000 flowchart and follow that to narrow down where your issue lies.
 
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