Ok good to know
I'll get the sw pcb to a buddy that can do pcb repairs.
Thanks
Brian
Star Wars vector - shrunk and skewed
Ok good to know
I'll get the sw pcb to a buddy that can do pcb repairs.
Thanks
Brian
KingOfTron
Member
So I fired mine up the other day, and it's completely back to normal! I want to say the screen was skewed for a couple of months, and now it's like nothing happened. I didn't really do anything besides unplugging and replugging some cords. Even then it didn't fix it. So here's hoping it stays this way!
Phetishboy
Well-known member
Sounds like cold solder joints. wiggle your connectors at the headers and see if the problem comes back. If it does, you'll need to reflow the solder.
Update
ok, a local guy (thanks Kip!) let me take my PCB to his place and he fired it up in his known working test rig (he fired it up with his SW PCBs before he did mine and his looked perfect). Plugged mine in and it looked exactly the way it does in my cab - shrunk and skewed. So - the problem if DEFINITELY in the PCBs.
Things we think is not the problem (based on others' posts in this thread):
-pot adjustments
-AVG generator
Things we think it could be:
-brown caps
is there a way to check caps? multimeter? continuity tester?
Anyone have more ideas or made progress? is there anyone reliable I can send my boards to and pay to fix?
ok, a local guy (thanks Kip!) let me take my PCB to his place and he fired it up in his known working test rig (he fired it up with his SW PCBs before he did mine and his looked perfect). Plugged mine in and it looked exactly the way it does in my cab - shrunk and skewed. So - the problem if DEFINITELY in the PCBs.
Things we think is not the problem (based on others' posts in this thread):
-pot adjustments
-AVG generator
Things we think it could be:
-brown caps
is there a way to check caps? multimeter? continuity tester?
Anyone have more ideas or made progress? is there anyone reliable I can send my boards to and pay to fix?
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Some multimeters can test caps, but have to be tested out of circuit.
So, because of this most people just change caps - IE the whole lot (The electrolytics at least, or first)
Personally, I would look at the diagram and figure out what part of the circuit would cause the problem. I would be thinking a transistor might.
Looking forward to progress
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(as mentioned a long time ago) I also have a board with this exact problem, so I'm very interested in the outcome here.
I think the disc caps sound like a good possibility too. My problem is I've never replaced those. Is there any info we should know about replacing those? I guess I just don't know what to order. There are so many kinds of disc caps like that I just don't know what to get. Any guidance?
John
I think the disc caps sound like a good possibility too. My problem is I've never replaced those. Is there any info we should know about replacing those? I guess I just don't know what to order. There are so many kinds of disc caps like that I just don't know what to get. Any guidance?
John
tester007
Well-known member
you have to see the rating on the ones you want to replace from the schematics. But most will be .1uf 50v +/-5% regular ceramic. Doesn't matter if they are in a disc shape or not.
Deadly
New member
I have my doubts about a defective AVG being the cause. While it never hurts to have an extra AVG on hand (as these are prone to going bad) I'm wondering why you didn't simply ask Kip to swap the AVG board itself. And then if the problem disappeared then swap only the AVG chip?
My experience with defective AVG's usually shown random vectors being drawn in odd directions and different time intervals. Some produced more lines than others.
My experience with defective AVG's usually shown random vectors being drawn in odd directions and different time intervals. Some produced more lines than others.
I agree 100%. I've tried numerous good AVGs in my board doing this, and it has nothing to do with the problem. Sorry to poo-poo the idea, but it's a waste of time and money. It's not the AVG.
John
Yeah - I reread this forum post today and realized you said you had the EXACT same problem and already tried the AVG - I somehow missed that key piece of data. I have already talked to Kip about trying the AVG swap before buying one - will let you know how it goes if that's not it I have a friend who is going to closely check the board for cold solder, etc and see if he can find the problem. If he can't find the prob I may just send it to Elektronforge.
if that's not it I have a friend who is going to closely check the board for cold solder, etc and see if he can find the problem. If he can't find the prob I may just send it to Elektronforge.
HudsonArcade
Well-known member
Did the "VERY knowledgeable" person happen to sell AVGs?
It's almost definitely not the AVG... it's just a state machine controller and has nothing to do with actual geometry.
Nope - "very knowledgeable" doesn't sell AVGs
So... took the PCB over to a friend (thanks again Kip!) and swapped in an AVG - no change at all. played with the pots and it changed things but couldn't fix the problem. Time to send it off to be fixed.
VectorJunkie
Well-known member
Nope - "very knowledgeable" doesn't sell AVGs
So... took the PCB over to a friend (thanks again Kip!) and swapped in an AVG - no change at all. played with the pots and it changed things but couldn't fix the problem. Time to send it off to be fixed.
Btw - the pots go bad and may need to be replaced.
It is true that the pots go bad. But this isn't a pot problem. (IMHO). Maybe I'll try tackling this thing this week. I've got a SW in my shop at the moment. I might dig out my board doing this and start shotgunning components until I find the problem.
But I might not, too....I'll let you know if I get inclined and have the time.
John
But I might not, too....I'll let you know if I get inclined and have the time.
John
Level42
New member
Definitely not a pot problem.
Pot problems look like this:
http://www.youtube.com/watch?v=yF5hvj2_OBA
Pot problems look like this:
http://www.youtube.com/watch?v=yF5hvj2_OBA
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I have the same thing happening now
http://forums.arcade-museum.com/showthread.php?p=2401819#post2401819
I will report the result when I find it
http://forums.arcade-museum.com/showthread.php?p=2401819#post2401819
I will report the result when I find it
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If the Aux PCB edge connector is back to front this will occur
Amplifone, or WG6100, doesn't matter same harness
