BattleZone Aux baord problem

Talon2000

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Got a BZ that when the BattleZone text scrolls upward, it's just a bunch of random vector lines. Swapping the aux with a known good takes care of it.

So far I've replaced all the sockets, swapped all the ALU's and the pokey.
I've also tried swapping the custom dips, and reflowed the header pins. So far no help.

All the other graphics appear just fine. It's just the scrolling text that has problems.
 
I had a problem where there would be random vector lines right at the very beginning of the attract-screen text-roll where it says, "Battlezone", but it was just when the Battlezone logo was first going on the screen, and then it would clear up after a few seconds and then the logo would be fine. Game play was perfect. No errors in self-test. Turns out that one of the ROMs (I can't remember exactly but maybe at 1N?) was bad.

I remember telling the guy who bought it from me what the fix was, maybe in a PM or e-mail, but I can't find it now...
 
I had those glitches with the title screen too. I had bad ROM chip at location B/C3. Replaced the ROM, no more glitches. I went through the AUX board fixes, like reflowing solder, and even replacing the POKEY chip, and math chips. After I replaced the bad ROM I did a test to see if the problem would come back. I pulled the ROM and powered the game up, and the title screen went crazy and I lost the obstecles graphics, replaced the ROM back in, and problem went away. So check that ROM chip.
 
Ok, I'm showing a L on the self test.

I can swap the aux with a known good. Works fine, self test fine
I can swap the Main board with the Bad Aux, Same problem.
I can swap bc/3 with known good same problem

Problem doesn't appear to be with the main board.

I'm not to familiar with t/s aux boards. Other than having swapped all socketed chips with known good, and problem persists. So it's somewhere in the TTL just not sure where to look at this time.
 
I had the L too on my game. My fix was in the that ROM. But I also replace the POKEY chip and the math chips plus all the sockets for those chips. I also got a new interconnect cable from Elektron Forge. I also replaced both black edge connectors.
 
Have you swapped the bi-polar PROMs between the two Aux. boards? I'd check the PROMs (and their sockets).

Edward
 
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