WG K7000 monitor intermittently flashes vertical line then shutdown

scottkeen

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WG K7000 monitor intermittently flashes vertical line then shutdown

The other thread I had started was dealing with a totally dead monitor. I now have it working perfectly -- but only intermittently.

It seems that for no apparent reason the monitor will flash a bright line down the middle and shut down.

Sometimes the arcade will be fine for 30 minutes and not shutdown. Other times it will be on for just a few seconds then it will shutdown. Sometimes it will shutdown if I bang the side of the cabinet, play the game, or trip the coin mechanism. Other times I can play the game for 30 minutes and bang my fist on the sides of the cabinet, and it won't shutdown.

I've re-soldered every connection on the main board, neck board, and remote board. The caps, flyback, VR have all been replaced with new parts.


Help! I'm so close to having this fixed (I think). Just need this last bit of help.


Please click here to see the video clip of the screen shutdown (0:06 seconds long)


k7000_1.jpg

k7000_2.jpg

k7000_3.jpg
 
Inspect all the solder joints around the horizontal width coil (do continuity checks, too), and check out C38 as well...
 
I don't know if this is relevant to the shutdown problem, but this plastic piece on the end of the neck was really brittle and broke and fractured when I first took the neck board off when I first got the arcade.

DSCN1011.JPG

DSCN1012.JPG
 
I don't know if this is relevant to the shutdown problem, but this plastic piece on the end of the neck was really brittle and broke an

nope. That's just a guide to help you get the neckboard on properly. You can run the monitor just fine without it (as long as you get the neckboard on the right pins)...
 
Directly behind the yoke connector. has 5 legs in a circle and sticks up vertical with an opening on the top for adjustments....

I re-soldered the wires attaching to the pins (there were 6 pins, only 5 had wires connected). Tried out the arcade and it shutdown a few minutes into the game.

As for C38, it's not a cap that I had replaced, wasn't in the cap kit. Should I get a new C38?
 
C38 is the horizontal width cap, and when it fails, it usually shorts and blows your fuse. But it sometimes gets cold solder on the legs and the pads can separate from the rest of the trace, especially once it heats up after a minute or two.

I'm willing to bet you missed some solder/trace issue somewhere. Did you go over all those areas circled in that pic in the sticky? Resoldering isn't the only fix. Sometimes you have to jumper the pad to the next closest one on the trace to guarantee the connection...
 
I re-soldered all the areas in the red circles in the sticky thread, and re-soldered the 5-pin horizontal width coil. It looks like several of those pins are bridged on the circuit board, is that correct? I also re-soldered C38.

Still having the same issue.

I don't think it's a horizontal collapse (maybe I'm wrong), it just seems like the monitor completely powers off for no reason. But it doesn't blow a fuse. Just shuts off. The effect is almost the same as pulling the power cord. Except pulling the power cord seems a little more "graceful", the screen flashes and the bright vertical line dims out to a dot slowly. When the monitor shuts down unexpectedly, it's sudden and quick and it doesn't dim out to anything. Just a pop, bright vertical line, and the display blacks out.

What else should we try?
 
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