Jailbars - are going to be the DEATH me - any more ideas?

Steverd

Active member
Joined
Aug 15, 2007
Messages
2,012
Reaction score
7
Location
Spokane, Washington
Jailbars - are going to be the DEATH me - any more ideas?

These Jailbars are driving me crazy!

Chassis: WG7901

1. FULL cap kit, Yes, even C57 which can cause this problem.

2. Sent the chassis off the Michael at www.tvrepaironline.com, and it works fine, tested fine and looks fine on his bench. He let it heat up, scoped the power feeds, raised and lowered voltages, etc

3. Replaced the switcher to a new Happ control switching power supply, No change.

4. I have ground from chassis, frames, etc, all the way to the ground plug.

5. Checked all of the caps on the PCB with my ESR meter - all good.

6. Adjusted the hell out of the neck board and chassis.

What I'm I missing? Is it time for a new monitor? I have new monitors in my Centipede and Outrun, I think I will try to run the Super Hangon video over to one of those!?!

s-hangon-6b.jpg


s-hangon-6.jpg


Thanks,
Steve
 
That is frickin odd. Mines the exact same way and i keep telling myself i need to o caps someday.

Two things i see is a little too much blue and the brightness is way too high.

It also appears as if your yoke is off center a bit. See how the image slopes down from left to right?
 
Last edited:
could be environmental

Any other games or electrical fields cause crazy things try moving the game to a new location even a few inches sometimes makes a big difference.
 
Swap your two horizontal yoke wires (probabyl blue and red) so that the image is displayed on the CRT backwards. If the jailbars are now on the right side of the screen instead of the left side, that will help you narrow it down, and eliminate the tube as the problem.
 
Swap your two horizontal yoke wires (probabyl blue and red) so that the image is displayed on the CRT backwards. If the jailbars are now on the right side of the screen instead of the left side, that will help you narrow it down, and eliminate the tube as the problem.


OK, just did this and the Jailbars moved to the right!!
What does that mean? What next??

s-hangon-6c.jpg


Thank you,
Steve
 
ok... that means its NOT the tube.... and likely NOT interference either.


Its still either a chassis issue or gameboard problem.


At this point i would back it up to another game and swap the video wires between games. THis will tell you if its a monitor chassis issue or a gameboard issue depending on your results.

If the hangon video looks good on a different monitor, then there is something still wrong with that chassis you have been working on. If the hangon picture has jailbars with a different monitor(that has verified good video with a different gameboard) , then you likely have a gameboard issue.
 
Last edited:
ok... that means its NOT the tube.... and likely NOT interference either.

Its still either a chassis issue or gameboard problem.

At this point i would back it up to another game and swap the video wires between games. THis will tell you if its a monitor chassis issue or a gameboard issue depending on your results.

If the hangon video looks good on a different monitor, then there is something still wrong with that chassis you have been working on. If the hangon picture has jailbars with a different monitor(that has verified good video with a different gameboard) , then you likely have a gameboard issue.

Well, that's good news, that's it's not the tube!

Also The Chassis was tested fully by Michael at Tvrepaironline as I said above, so, that leaves the PCB????

Even though the caps, tested OK, I think I may still replace all of them on the video board..

Thanks,
Steve
 
try removing the signal from the monitor and turn up the screen control until you get a faint grey picture. If you still have the jail bars its in the chassis (but you mentioned that it worked correctly elsewhere). If you dont have the bars then its the supplied signal from the logic board (which I've never seen (at least not that faint)).

You sir, have your self a basket case there.
 
backing up another game to it and swapping video wires is going to be the only way to truly tell what the hell is going on.
 
backing up another game to it and swapping video wires is going to be the only way to truly tell what the hell is going on.

While supplying another signal to it is one way to figure it out the way I suggested also works and doesnt require another game/signal. If the deflection board is producing the jailbars it will be obvious even without a signal.
 
Back
Top Bottom