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Black Screen issue with Colecovision

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I meant the SRAM, sorry for the confusion. I will try the U4 chip first, and then see what happens. Hopefully I can get this done in the next few days.I will update you when that's done hopefully with some good news. Thanks!!

Thanks

I replaced the U4 SRAM chip with no change. I am going to change out the U3 chip next.It will probably be later in the week before I have time to do this.

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Well, U3 isn't on the bad data line, so I wouldn't be so quick to swap it out. Turn your attention to U18 and U19 next. At the least, pull the chips and see if a short to ground still exists on the dead data line as seen in post 67.

Edited by ChildOfCv

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No, we're only looking for one that causes a short on that data line. And we only have the process of elimination with current equipment.

 

I'd pull player 1's first I guess though. Then see if you still see a short to ground. Then try player 2 without putting player 1 back yet.

 

In fact, I'd leave out any chip I pull until the one that eliminates the short is found. Then they can be restored one by one, still making sure the short isn't back.

Edited by ChildOfCv

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I finally got back to this. I apologize for the big gaps right now, but my son plays college baseball so during the season I don't have as much free time. I replaced controller chip for player 1 with no change. I have it socketed so I can pull it easily. What is the best location to check with the logic probe to check for the short to ground. I will busy for a couple more weeks and then I should be able to get back at it a little more frequently. Thanks

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I finally got back to this. I apologize for the big gaps right now, but my son plays college baseball so during the season I don't have as much free time. I replaced controller chip for player 1 with no change. I have it socketed so I can pull it easily. What is the best location to check with the logic probe to check for the short to ground. I will busy for a couple more weeks and then I should be able to get back at it a little more frequently. Thanks

The logic probe can't tell you about shorts. Not part of its mission statement.

 

To check for a short, turn off the power and use the multimeter in diode mode. If you see a low voltage, you have a short. You may also be able to get a reading in ohm mode. You'd be checking any of the locations in the picture in post #67.

Edited by ChildOfCv

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Hello, I get a blank black screen whenever I attach the Coleco Vision (Atari) Module #1 to my Coleco Vision console. If I detach the Atari Module the console works fine, but attached it is just a black screen. I've cleaned both with alcohol and opened the module up and everything looks great! I don't understand why I get this black screen?! PLEASE HELP!??

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Posted (edited)
On 6/2/2020 at 8:38 AM, BigRen said:

Hello, I get a blank black screen whenever I attach the Coleco Vision (Atari) Module #1 to my Coleco Vision console. If I detach the Atari Module the console works fine, but attached it is just a black screen. I've cleaned both with alcohol and opened the module up and everything looks great! I don't understand why I get this black screen?! PLEASE HELP!??

Dumb question incoming!!!  Are you making sure there's not a coleco cartridge in the coleco when you're trying to use the atari module?

 

The atari module won't work or display an image if there's a coleco game in the coleco at the same time.  I'm sure that's not the case but I like to start simple first. :)

Edited by Ruggers Customs

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Big Ben, on the Atari expansion module if you get a blank screen when plugged in there are a couple of things to check. First clean both the expansion port connector on the Colecovision with some alcohol and do the same for the expansion module connector. If you are comfortable taking things apart, remove the expansion module cover. Then remove the little zif connector ribbon from its slot, clean it as well and reinsert it.

 

** Please do all of this with the power cable unplugged.

 

Hope that helps. ChildofCV was very helpful to me when I tried to fix my black screen issue with my Colelcovision. I never got it working, but he was a big help!!

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Did you ever get this #1 module working some days ?

There is at least 3 model : PAL, NTSC and Y/C used for French consoles.

The Y/C one is pin incompatible with the standard pal/ntsc consoles.

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On 6/12/2020 at 4:08 AM, emmanuelf said:

Did you ever get this #1 module working some days ?

There is at least 3 model : PAL, NTSC and Y/C used for French consoles.

The Y/C one is pin incompatible with the standard pal/ntsc consoles.

There's also the SCART-compatible version.  It has component (YPbPr) inputs that get passed directly through to the SCART.  The audio and external video switching signals moved to other pins which were unused on the NTSC and PAL versions.

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