Star Wars vector graphics issue

80sarcade

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I just received my WG6100 back and it looks to be working fully. Let me back up a little. Had a mostly working SW. Everything worked but a couple of the graphics where messed up, like the rolling title would, at the very top shot off to the upper right corner as well as all the scrolling text. The red blocks with the growing towers would also show red lines going to the top right.
So, I cap the 6100 and put in a LV2000, and the flyback blows :-( Off to Chip.
I get the 6100 back and the picture is great, still have the lines going to the upper right (only some of them, most are fine) start adjusting the video board and then all the letters look like Chinese (pict attached) I work on the pots,, checked the caps for loose ones and cleaned all the edge connectors... So I have all the adjustments looking much better in test. Play a little and all the graphics start messing up and will getting better then way worse.
I am thinking a new AVG chip is needed, but wanted to throw this out to you guys to see if you agree.
Voltages are all good, plus rebuilt AR and a new big blue and bridge rec.
So close yet so far....

Thanks guys in advance.
Paul 80sarcade
 

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Well i have replace the AVG chip, did not change a thing.

Can anyone offer some advice or suggestions? I am looking for bad solder joints.

Thanks in advance
Paul
80sarcade
 
Well i have replaced the AVG chip, did not change a thing.

Can anyone offer some advice or suggestions? I am looking for bad solder joints.

Thanks in advance
Paul
80sarcade
 
Isn't this the Chinese bootleg ? ;)

You may need to go to the BIP test and make all the boxes align using the pots on the game board.
 
Last edited:
Thanks for the suggestion, I have checked and adjusted the BIP pots, no change. I also adjusted all the pots, no change. I checked for broken traces and re-flowed the pots and caps. still no change. No errors in the service modes. I also plugged the board into my Tempest and that monitor showed the same results, so I am pretty sure it is not a monitor issue but a AVG board issue. Not sure what I should try next.....

Paul 80sarcade
 
Based on your description that the problem worsens as the game warms up, I would freeze spray the IC's slowly with the board connected and powered on. Watch the screen to see if the problem improves when the chips are cooled. You should be able to isolate the failing component using this method.
 
What I meant to say is it get worse as it warms up. I starts out pretty bad and sometimes gets a little better and then worse again. As you can tell from my youtube video, it is pretty bad. I have replaced the AVG chip with no change.
I am now looking for someone to fix.
ELEKTRON FORGE is OOO (out of the office) and ELutz also backed up with work.

Anyone else any good at fixing AVG boards?

It kills me having an almost working Star Wars...... :-(


http://www.youtube.com/watch?v=EG_Cg3g0AT0

Paul
80sarcade
 
Tests are all fine. I did reseat all socketed chips and cleaned the contacts. I even re-flowed the pots and anything that looks suspect. No change.

Can a bad pot(s) cause this?

The graphics where fine until I adjusted the pots. I was having an issue with the red tower ports streaking off to the upper right as well as blue in the death star explosion. This issue is also still there. You can see this at the end of the youtube video with the death star explosion.

Paul
80sarcade
 
I would think that problem is related to pot adjustment, or a bad resistor or cap in the Y circuit (X looks fine, Y looks like it way overshoots). Do all of the pots seem to make some sort of adjustment, or are there any that don't do anything? Have you checked them w/ an ohmmeter? From a quick look at the schematics, the Y circuit looks to have 5 pots: R68, R71, R74, R88, and RV2.

About your other problem, I'd say the scaling problem (jumpy zoom out) is related to the line to the corner... it could be the scaling circuit, though I don't know if the scaling circuit is actually used there, or if the scaling is done in software... but it looks like the scale repeats itself, like one of the scaling bits is stuck.

DogP
 
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