GRAVITAR - Strange display

[jetusenet]

Hi;
I have a Gravitar that worked until I fixed it!

The display is garbled and instead of the usual coming up slowly when powered up, the display is dark then the display "pops" up, already bright etc......

Anyway, it has a Clay AVG replacement board and D102 is bright when the game is fired up but D101 is dim.

I poked around the PCB on the bench and found C110 broken, so I replaced it and IC A/B11-7 was bent underneath the IC so I straightened that out as well. Funny how the game worked even with those 2 components not quite right.......

I think that maybe the AVG PCB is bad, as indicated by the dim LED but before I replace that with a good one and possibly damage that one, I would like to get some opinions on why the one LED is dim.

Thanks much
Jeff

[jetusenet]

These are the pics of the display...........

[jetusenet]

To claify what I had meant by "fix it"....

I rebuilt the power brick, the A/R II, replaced the line cord and rebuilt the Monitor. I tested the monitor on a SD and it worked fine so that is not the problem......

Jeff

[kstillin]

What happens if you jiggle the power connector?

Sometimes mine comes up with some jaggled/jumbled/jumpy vectors and it straightens out if I power down/back up.

[jetusenet]

Which connector are you taking about?

My concern is that the one LED on the AVG PCB is not as bright as the other and I feel that it indicates a problem somewhere.....

[kstillin]

I was talking about the PCB edge connector. I don't recall if it was the long or the short one. I just use the power switch to cycle it if it starts off bad now.

[jetusenet]

I came across a Black Widow that did that once, I would cycle the power and it would clear up....
But unfortunately, it does not work in this situation, I tried several times.
I will check the edge connector but I feel that the LED on the AVG PCB is trying to tell me something.
Thanks for the suggestion though.
Jeff

[electrotim]

Originally Posted by jetusenet

Which connector are you taking about?

My concern is that the one LED on the AVG PCB is not as bright as the other and I feel that it indicates a problem somewhere.....

D102 will be dimmer than D101.

See http://www.multigame.com/137179.PDF

[MajorHavoc]

Need to isolate which part is the problem:
PCB, AR2, power brick (I see you already verified the monitor is good)

I know you are dialed in on the PCB already. But since you made changes to both the AR2 and power brick, it would be a good idea to verify that your focus on the PCB is the right direction.

[jetusenet]

This is one for the history books........
It seems that it was not me after all, it had something to do with the monitor/PCB combo, they will just not work together!

I swapped the A/R II and power brick with known good working and still had the same problem.
I hooked up the monitor to another Gravitar cab and it worked fine.
I put the Gravitar PCB in question into the same cab and BAM, it no work!
I replaced the deflection PCB - NG.
I replaced the HV cage - NG.
I swapped monitors and BAM - it works!

So...... what I had to do was to replace the PCB in question with the replacement, use the original rebuilt monitor, A/R II and power brick and now everything works proper.

Has anyone else ever had a PCB that was incompatible with a monitor before!?!?!

Very weird.....

Jeff