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Retro_Game_Lover96

ColecoVision Console Problem

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Hey all. I bought a ColecoVision from eBay. It works, but the graphics are garbled, so is there anyway to get this problem fixed?
 
 
EC1388E4-2A65-42D5-94C3-BECDE9AF9D1B.thumb.jpeg.d1bd3635ffef1cad559a3ea6390b7630.jpeg
I believe this is the common problem with bad RAM. As I recall, people replace the RAM with 5-volt RAM and mod the console for it.

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39 minutes ago, CZroe said:
2 hours ago, Retro_Game_Lover96 said:
Hey all. I bought a ColecoVision from eBay. It works, but the graphics are garbled, so is there anyway to get this problem fixed?
 
 
EC1388E4-2A65-42D5-94C3-BECDE9AF9D1B.thumb.jpeg.d1bd3635ffef1cad559a3ea6390b7630.jpeg

I believe this is the common problem with bad RAM. As I recall, people replace the RAM with 5-volt RAM and mod the console for it.

That should definitely fix the problem.

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38 minutes ago, doubledown said:

Or possibly the power supply, or possibly the On/Off switch.

This....

 

Last CV I modified for a client was doing the same thing. Just had to clean up the power port plugs and the switch to make it look proper again. In fact, it was looking just like your screen cap. Client still had me change out the slide switch for a rocker to be on the safe side though.

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15 minutes ago, -^CrossBow^- said:

This....

 

Last CV I modified for a client was doing the same thing. Just had to clean up the power port plugs and the switch to make it look proper again. In fact, it was looking just like your screen cap. Client still had me change out the slide switch for a rocker to be on the safe side though.

 

Replacing with a rocker is nearly a must IMO. Those old sliders are toast after almost 40 years.

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6 hours ago, Retro_Game_Lover96 said:

Hey all. I bought a ColecoVision from eBay. It works, but the graphics are garbled, so is there anyway to get this problem fixed?

 

 

EC1388E4-2A65-42D5-94C3-BECDE9AF9D1B.jpeg

That's because you bought the Russian version 🥴

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1 hour ago, Retro_Game_Lover96 said:

http://cvaddict.com/article.php?articleid=19

 

This site I just discovered about the bad DRAM chips, and one of them looked like my image, so this could be the bad U15 chip.

The point that the others were making, though, is that if the system doesn't get adequate power, then those chips don't get adequate power, and you get the same symptom as if the chip was defective.  Each of those chips need 3 voltages:  +5, -5, and +12.  The two positive ones come through the slide switch.  So if the switch is bad, or if only one of the voltages from the power supply is bad, or for any other reason the chips don't get adequate power for their requirements, then you'll see something like this.

 

So the point is, don't replace your motor before checking if you're out of gas.  You can measure the voltages at C41, C42, and C43.  One side of each will be ground and the other side will be the power rail.  All 3 are to the left of the video chip.

 

In your case, the errors seem consistent with bad U12.

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So.... your voltages check out then?

 

No, that chip is not a direct replacement for the 4116's.  You'd have to modify the board to work with that.  And then you'd be better off getting the upgrade kit from console5.com, since it also comes with instructions.

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Did you try to put a game in the console?    What happens after you passed the introscreen and the skill select screen? Does the game looks good?

 

Seeing you picture,  i would say that it is not the Original Bios , ..as said ChildofCV  as a joke but may be not... , could be a russian Hack of the BIOS.

 

That's very strange that we can read    (c)1982  CKHACK  ...

 

And it is very strange also that if you see "garbadge"  "random" characters like you see, someone else  can see EXACTLY the same sequence.

Follow the link below.

 

 

Or you bought his console!!!

 

 

 

 

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Many of the mistakes show an off-by-4 error.  For instance,

         PQRJ
+        44 4
-------------
         TURN

         CAIA
+        4 44
-------------
         GAME

          KBB
+         444
-------------
          OFF

       BABKRA
+       444 4
-------------
       BEFORE

    IJSARPIJC
+    4 4 4 44
-------------
    INSERTING

    [email protected]
+      4  444
-------------
    CARTRIDGE

           KR
+          4 
-------------
           OR

    AXPAJSIKJ
+   4   4  44
-------------
    EXPANSION

      [email protected]*
+     4444444
-------------
      MODULE.

The (c) is supposed to be 00011101, but ends up as 00011001, which is undefined by the CV character map and blank.

 

So bit 2 seems to be zero for the most part.

 

Also for the numbers,

1 = 00100001

9 = 00101001

8 = 00101000

2 = 00100010

 

Since all 4 of these digits have bit 2 = 0, they are unaffected.

 

 

 

Anyway, how do the voltages read?

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That may be useful, but the voltages are needed elsewhere too.  You should at least measure them.

 

Anyway, those eBay chips fit the profile for the 5V mod.  The remaining question is whether they fit the specs or are just relabeled trash.  Unfortunately, you won't know until you try.

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24 minutes ago, ChildOfCv said:

That may be useful, but the voltages are needed elsewhere too.  You should at least measure them.

 

Anyway, those eBay chips fit the profile for the 5V mod.  The remaining question is whether they fit the specs or are just relabeled trash.  Unfortunately, you won't know until you try.

Basically, there was a video about it as well.

 

 

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