monitor troubleshooting, need help

Vongoosewink

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I've got a monitor that is only displaying a vertical line, but the game still seems to be running (making noises, sound responses to controls). Does this sound like a familiar problem to any of you tech-wizards out there? Thanks!
 
Monitors are routinely traded out over a machine's lifetime. Again, what is the specific make and model of the monitor?
 
Is it a vertical line or a horizontal line? A horizontal line is far more common a failure, and is usually caused by a cold solder joint on the yoke connection, or in a G07, possibly a cold solder joint on (or open) the fusable resistor in the vertical section.

Note that vertical mount monitors are electrically identical to a horizontal monitor - so a vertical line on a vertical montor is really a horizontal line - indicating failure of the vertical deflection.

-Ian
 
Monitors are routinely traded out over a machine's lifetime. Again, what is the specific make and model of the monitor?

To expand on what Ken is saying, you can't ID the monitor inside your Dig Dug just by telling us it's a dig dug. That's like trying to figure out what kind of shoes you have on by saying you're a Catholic. Just like many Catholics have lots of brands of shoes (and it can be assumed that they HAVE shoes), so do many arcade machines have many brands of monitors (and it can be assumed that they HAVE one).

We'll be looking for something from the circuit board near the monitor itself. Most likely your monitor is either a Wells Gardner or Electrohome. That plus the model number (like 19K4901, or G07-CBO) will assist us in helping you figure out your problem. Don't give us the number stamped on the picture tube (like 19KUP22, or A48AGD02X) because those aren't the monitor model number, those are the specific tube numbers.

My peremptory guess - bad solder joints in the area of the horizontal width coil.
 
And if you can't figure out what kind of monitor it is - just post a picture. We can identify most monitors from across the room.

But the most common cause of lost vertical deflection is simply a cold solder joint at the yoke connector. Happens on television sets all the time.

-Ian
 
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