asteroids issue, everything is a line

tron guy

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I thought about putting this in the monitor section but I am not sure it is a monitor issue.

I just got the game. I have done a couple of things to it.
replaced one socket and put in a rebuilt power board. Those two things did nothing to change how it played.
It was playing just fine, with (in my opinion) a couple of sound issues. The flying saucers never made any noise.

Today I turned the games on for 1/2 hour or so. I looked up at one point and everything on the screen was a small line. I coined her up and played and it was just lines. my bullets were lines, the asteroids were lines.

The screen is not collapsed in anyway, or shrunk.
the graphics just went flat.
 
Horizontal or vertical lines? Check the 191's in the 9 and 10 columns on the board...
 
Horizontal or vertical lines? Check the 191's in the 9 and 10 columns on the board...

horizontal lines

am I just checking the legs for voltage?

I did order a bob roberts pcb cap kit that should be here tomorrow as well.
 
If you have a logic probe you could check the legs to see if any aren't pulsing properly.

For horizontal, check C9, D9, and E9. If you have a rev 5 version of the pcb, change the 9 to a 10...
 
so if I don't have a logic probe, I should probably not mess with it right now?
 
Well you could take a meter, put it on diode test, then test each pin against ground, and compare that to the other two chips to see if they read the same. Sometimes you can identify shorts or opens that way. if one chip has a different reading than the others, it should be pulled and tested again...
 
well I couldn't tell if it was revision 5 or not, but I checked the legs on both 9 and 10
I am not very good at deciphering the information I am getting from my meter in all honesty.
I mean, I can read voltages.
anyway, they are measured the same with the diode measurement.
turns out the game was back functioning again.
I left it on for 20 minutes or so without a recurrence of last nights episode.
 
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