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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Whenever I try to get mine to work, it only shows a white screen with squares and line grey colored like a maze. Anyone ever have this happen to theirs? Tried to search the web but no help. Can someone please offer some help? Thanks.
    Last edited by thegamezmaster; 11-11-2013 at 07:09 AM.

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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Can someone at least get me started in the right direction to fix, please!
    Last edited by thegamezmaster; 11-11-2013 at 07:09 AM.

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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Has anyone ever fixed one? What was wrong? Thanks!

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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Please can someone offer some advice or help? Need to get working as it's CIB with all the paperwork. Thanks!

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    Have you cleaned the cartridge port and verified that no pins are bent / broken?

    If so, the next thing I'd do is check for clean, ripple-free power at the CPU's (IC7) pin 40.
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    I don't want to be Captain Obvious but like FABombjoy said; have you tried thoroughly cleaning the cartridge port?

    If you want to do it gently then liberally spray a cart's contacts with CRC Contact Cleaner and insert the cart over and over again to clean the cartridge port. If you want to get fancy and expensive use Deoxit Contact Cleaner instead. However if using Deoxit then I would repeat the procedure with 91% Isopropyl alcohol to remove any lubricating residue that Deoxit might leave behind; it actually can prevent cartridges from reading properly.

    If that doesn't work then you can try using fine grit sandpaper wrapped around a plastic card to remove corrosion. It's somewhat risky though as you can damage the contacts if you are not careful; only do so as a last resort.

    I think the Odyssey 2 uses the same power adapter as a Sega Master System and Genesis. Try using a different power supply with a 9v DC + @ - (positive outer, negative inside) Don't use a NES Power Supply though as it is AC; it will fry most consoles. I learned this the hard way

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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Quote Originally Posted by FABombjoy View Post
    Have you cleaned the cartridge port and verified that no pins are bent / broken?

    If so, the next thing I'd do is check for clean, ripple-free power at the CPU's (IC7) pin 40.
    Cleaned the cartridge port and carts several times. No bent pins. Don't have an oscilloscope to check pin 40 of CPU for ripples. What should voltage be? Thanks everyone who has offered help, much appreciated!

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    If you have a picture on your TV, you probably have 5-ish volts. Likewise, if there isn't a buzz from the audio and/or a rolling bar in the picture then you probably don't have rectifier problems. If you have way less than 5v then you may have a regulator problem. I'd still suspect something physical like a damaged cart connector solder joint, but these are easy checks to make sure the power is good.
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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Quote Originally Posted by FABombjoy View Post
    If you have a picture on your TV, you probably have 5-ish volts. Likewise, if there isn't a buzz from the audio and/or a rolling bar in the picture then you probably don't have rectifier problems. If you have way less than 5v then you may have a regulator problem. I'd still suspect something physical like a damaged cart connector solder joint, but these are easy checks to make sure the power is good.
    Thanks for the help. I'll check it out and post results.

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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Quote Originally Posted by FABombjoy View Post
    If you have a picture on your TV, you probably have 5-ish volts. Likewise, if there isn't a buzz from the audio and/or a rolling bar in the picture then you probably don't have rectifier problems. If you have way less than 5v then you may have a regulator problem. I'd still suspect something physical like a damaged cart connector solder joint, but these are easy checks to make sure the power is good.
    Measured the power supply and output is 12.7 VAC. Measured pin 40 of IC7 and it read 4.80 VDC. So I measured the output of the regulator and it read 4.85 VDC. So I'm not sure if it's the power supply not putting out enough or the regulator. Do have another ps rated at 11.5 VAC 400mh and measured it and it's output is a little over 13 VAC. Not sure if the 4.8 VDC is the problem or not.

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    Are you using an Odyssey2 power adapter? If you have an NES power supply, try it.

    4.8v is getting low. What does the regulator input measure? Do any of the chips get hot after running for a minute or two?
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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    I am using a Magnavox ps. Input to the regulator is 11.5 V. What rating ps should I use? Have to check the chips. Thanks.

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    Default Magnvox Odyssey 2 White and Grey Screen Problem

    Tried different power supplies, same results. Pin 40 and regulator still putting out 4.8VDC. Bad regulator? What regulator do I need if that's it? Can't read off part. Thanks.
    Last edited by thegamezmaster; 01-09-2014 at 03:57 PM.

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