JustinZ
Member
Tempest display issues but don't think it's monitor
Hello,
I am pretty much completely new to working on arcade machines, so please bear with me as I ask some pretty basic questions.
I have a two-board Tempest which suddenly one day started not displaying correctly. I do not think the issue is the monitor because it is doing things that don't make sense from a monitor perspective -- crossing text over other text, drawing lines that do not intersect or meet at the points they're supposed to, etc. Also on the title screen there's a big chunk taken out of the lower left corner of the "zooming box" or whatever you want to call it.
I do not have a lot of equipment but I do have a multimeter so I checked the little test rings on the boards and found the following:
+22 and -22 on the logic board are at +/- 25 or so.
The ROMS are getting about +4.3, except ROM 5, which is getting +3.3ish.
Everything else is basically normal.
Um, some other common questions I've seen in searches that may or may not be pertinent . . . Big blue has definitely been replaced. There's an LV2000 on the monitor.
I am not sure what else to check or what to do if one of the above issues could be causing the problem. I have attached some crappy webcam screenshots to explain what I mean with lines not intersecting and the like.
Thanks a lot in advance everybody.
Hello,
I am pretty much completely new to working on arcade machines, so please bear with me as I ask some pretty basic questions.
I have a two-board Tempest which suddenly one day started not displaying correctly. I do not think the issue is the monitor because it is doing things that don't make sense from a monitor perspective -- crossing text over other text, drawing lines that do not intersect or meet at the points they're supposed to, etc. Also on the title screen there's a big chunk taken out of the lower left corner of the "zooming box" or whatever you want to call it.
I do not have a lot of equipment but I do have a multimeter so I checked the little test rings on the boards and found the following:
+22 and -22 on the logic board are at +/- 25 or so.
The ROMS are getting about +4.3, except ROM 5, which is getting +3.3ish.
Everything else is basically normal.
Um, some other common questions I've seen in searches that may or may not be pertinent . . . Big blue has definitely been replaced. There's an LV2000 on the monitor.
I am not sure what else to check or what to do if one of the above issues could be causing the problem. I have attached some crappy webcam screenshots to explain what I mean with lines not intersecting and the like.
Thanks a lot in advance everybody.
