The NEW Build Your Own Arcade Controls
Main => Monitor/Video Forum => Topic started by: redfivexw on May 24, 2005, 10:48:48 pm
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hi everyone,
i have a rolling thunder machine, with a wells-gardner monitor. It was working fine for several years and looked good. I recently moved it to the other side of the room and when i turned it on, the monitor does not work. I dont hear anything coming from it, no orange glow on the back, not the normal noise you hear when the monitor gets power, i checked inside and dont see any loose connections. Anybody know what could make it stop working so suddenly?
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What model? Wells-Gardner has dozens of models.
Here's what to look for in general:
When you moved the game, did something come unplugged/unconnected?
Did something come loose and fall on the monitor circuit board thus shorting something out and blowing a fuse?
Did you bump/jar/crack the neck of the picture tube or the neck circuit board?
How old is this monitor? Has it had a capkit recently?
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I will check the monitor model number shortly, I do not see anything that could have fallen on the board, actually it is quite clean inside. I have not had anything done to this monitor, it is a 1987 machine, i think it was pretty much stock equiptment. The glass all looks good, no cracks or problems i can see. As i said, it had a good picture, working fine for 2 years in my house, i moved it and when i plugged it back in, just black. the game itself is working, but no picture. It is as if it is not getting power, but everything else works.
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The model number is WG 19K4914. While i was looking for the model number i noticed a fuse on the board that looks like it might be no good. It is covered with a plastic shield so it was hard to tell but i think that the strip of wire in the center was broken. The fuse is labeled F501 4A 125V. It looks like it is soldered in. It is the only fuse i see, could this be the likely culprit? If so, what is the best way to replace it and what size fuse is it? Can i just unsolder the fuse and solder a new one in?
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I believe it is a 4 amp fast blo 'pigtail' fuse. Yes, you unsolder the bad one and solder in a new one.
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Ken,
Do you have to remove the chasis to replace the fuse, or can it be done in place (with the power off, obviously)?
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yes, i was wondering the same thing, i am planning on doing it in place, i think i can reach it pretty well.
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The circuit board must be unbolted and flipped over to unsolder the fuse.
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Ken,
i soldered in a new fuse, it blew immediately. I tried 2 more and the fuse blows immediately upon turning the machine on. Any idea what could cause this, as i said before, the machine was working fine, there is nothing loose, nothing on the board, I am at a loss. I have one fuse left, what should i check?
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That sounds a lot like a short somewhere. Check for leads on components that may be bent over and/or barely touching something they shouldn't. Could also be a blown component somewhere. Look for brown tainted components (and possibly smoke stains on the board.)
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there are no stains on the board, the board looks good. This is really weird, and frustrating.
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It could be one of the following:
Shorted horizontal output transistor
Bad flyback transformer
Shorted power supply section diode
Shorted voltage regulator in the power supply section