Star Trek SOS repair - not my idea of a good time

Those monitors look great!

Thanks for the assist Sam. Want me to fix those sound/speech boards for you? Include them with the XY set and back plane board.

Its the least I can do.

You're a glutton for punishment. I might if I have room in the box. Usually the speech boards aren't too bad, most of the time it's a bad op amp. The sound boards, I have fixed a couple and wile the manual gives a pretty good break down which section combinations makes which sound it still can be a challenge.:D
 
You're a glutton for punishment. I might if I have room in the box. Usually the speech boards aren't too bad, most of the time it's a bad op amp. The sound boards, I have fixed a couple and wile the manual gives a pretty good break down which section combinations makes which sound it still can be a challenge.:D

I owe you for letting me use your boards to troubleshoot this game I have.

If they are in the box I'll take care of them.
 
That's really amazingly nice of you, Sam.
 
Just for the sake of saying I did it I powered up the factory power supply this morning. No change in the video output.

Factory supply outputs were very clean too!
 
It's too bad that all the competition and patent law caused the G08 to be a POS! Could of been a great monitor.
 
Hey Matt, wile looking over some of my G08 stuff I found my hard copy of Sega's Color XY monitor service manual. I looked and found a PDF version online. It has a lot of info on how the monitor and XY boards work together. Just wonder if you have seen this before.
http://arcarc.xmission.com/PDF_Monitors/Sega Gremlin Color X-Y Monitor.pdf

I remember seeing that book BITD in these games. I sat and read one while working on a G08 in a Dedicated ST:SOS too.

Thanks for the link Sam.
 
I'm glad I found this thread, I've been doing a little research as I'm going to begin working on a few XY Timing boards that I have that aren't working.

So far I have gone as far as testing what boards work and don't but I haven't done any diagnosis as to why they are down.

I'll be sure to follow this thread, there's some good information in here.

Good luck with your repair.
 
I'm glad I found this thread, I've been doing a little research as I'm going to begin working on a few XY Timing boards that I have that aren't working.

So far I have gone as far as testing what boards work and don't but I haven't done any diagnosis as to why they are down.

I'll be sure to follow this thread, there's some good information in here.

Good luck with your repair.

Theres another thread, "My Sega G80 repair thread," or something along those lines that you may also want to subscribe too. The thread starter plans on working through several sets of G80 boards and I'm sure it will be full of valuable information.
 
Theres another thread, "My Sega G80 repair thread," or something along those lines that you may also want to subscribe too. The thread starter plans on working through several sets of G80 boards and I'm sure it will be full of valuable information.

I saw that and subscribed also :) he has a lot of board sets but what he is currently working on isn't what I have broken, hehe. Great information none the less, these things don't last forever so having the knowledge to fix them is really important.
 
Sam - boards received today. Thanks again for sending that second set.

First thing I did was to connect them to my test fixture. Double check, triple check, turn on... NOTHING... :(

Decide to move the boards to your backplane, still nothing. ARGH!!! Decide to reseat the RAM and ribbon cable and we have a nice solid picture. So, your boards and back plane with my CPU and ROM board works... As I'm looking over the boards I slightly move the one in the front (XY timing) and the game locks up. Hmmm... reset it, wiggle the boards and the game randomly pauses. Dirty edge connectors?? Nah, they look good. Gota be the damn female edge connectors on the back plane.

Move the boards back to my back plane and they work now but still reset when moved. I'm thinking about replacing the edge connectors on my back plane. I know the boards dont MOVE when they are in the cage but if they reset when hardly moved at all thats not good.

Onto testing the other boards. Wish me luck!
 
Sam - boards received today. Thanks again for sending that second set.

First thing I did was to connect them to my test fixture. Double check, triple check, turn on... NOTHING... :(

Decide to move the boards to your backplane, still nothing. ARGH!!! Decide to reseat the RAM and ribbon cable and we have a nice solid picture. So, your boards and back plane with my CPU and ROM board works... As I'm looking over the boards I slightly move the one in the front (XY timing) and the game locks up. Hmmm... reset it, wiggle the boards and the game randomly pauses. Dirty edge connectors?? Nah, they look good. Gota be the damn female edge connectors on the back plane.

Move the boards back to my back plane and they work now but still reset when moved. I'm thinking about replacing the edge connectors on my back plane. I know the boards dont MOVE when they are in the cage but if they reset when hardly moved at all thats not good.

Onto testing the other boards. Wish me luck!

Are you using the Vector-labs ATX power supply adapter? If so how strong is your ATX Power supply?

I had a lot of weird issues (some like you describe) while I was testing boards using one with a "280watt" power supply. I switched to a known good original and all the problems went away.

I'm sure the adapter is good it probably just needs a beefier power supply. Might want to give that a look just in case.
 
Sam - boards received today. Thanks again for sending that second set.

First thing I did was to connect them to my test fixture. Double check, triple check, turn on... NOTHING... :(

Decide to move the boards to your backplane, still nothing. ARGH!!! Decide to reseat the RAM and ribbon cable and we have a nice solid picture. So, your boards and back plane with my CPU and ROM board works... As I'm looking over the boards I slightly move the one in the front (XY timing) and the game locks up. Hmmm... reset it, wiggle the boards and the game randomly pauses. Dirty edge connectors?? Nah, they look good. Gota be the damn female edge connectors on the back plane.

Move the boards back to my back plane and they work now but still reset when moved. I'm thinking about replacing the edge connectors on my back plane. I know the boards dont MOVE when they are in the cage but if they reset when hardly moved at all thats not good.

Onto testing the other boards. Wish me luck!

Well that's progress. That back plane has been inside next to my computer for the last 10 years, most of the time covered up with papers, manuals etc. but I did notice it has some dust bunny's I meant to blow it out with compressed air but forgot. I knew these XY boards had to work this time but you can never say that with 30 plus year old boards only designed to work 5 years but most never made it 3 years just like the original Star Trek TV show did, 5 year mission cut short. If you ever get around to that sound board in this lot it was putting out some funky sounds.:rolleyes:
 
Are you using the Vector-labs ATX power supply adapter? If so how strong is your ATX Power supply?

I had a lot of weird issues (some like you describe) while I was testing boards using one with a "280watt" power supply. I switched to a known good original and all the problems went away.

I'm sure the adapter is good it probably just needs a beefier power supply. Might want to give that a look just in case.

550watt supply with adjustable +5, +12 and +3.3 (not that the 3.3 is used). All voltages check good at the board. For the sake of trying it I did use a known good factory supply. Problems persisted.
 
Well that's progress. That back plane has been inside next to my computer for the last 10 years, most of the time covered up with papers, manuals etc. but I did notice it has some dust bunny's I meant to blow it out with compressed air but forgot. I knew these XY boards had to work this time but you can never say that with 30 plus year old boards only designed to work 5 years but most never made it 3 years just like the original Star Trek TV show did, 5 year mission cut short. If you ever get around to that sound board in this lot it was putting out some funky sounds.:rolleyes:

So far with the help of these working boards I've been able to verify that the remain XY Timing boards I have here are all good. In total I have 4 pairs of boards now (three of them being yours). The remaining 3 XY control boards are all puking up random vectors. My board is the worst with your "unknown" board coming in second place in the fail dept. :)

I cant test 74LS95's on either of my testers so I've ordered some just to have them. In the meantime I'm going to look at them on my scope to see if they are contributing to these problems.
 
probing the LS95's between the good board and bad board revealed nothing conclusive. On the good board and the bad board I can see what look like stutters on the bus lines so that seems normal.

It occurs to me that whatever tells the board to NOT draw (aka blanking I guess) is not working right on the non working boards.

Hmm...
 
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