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Type: Posts; User: pyroesp

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    From my quick search on google it looks like...

    From my quick search on google it looks like plasma is interfering with IR, but the fix is just using tape (?).

    Quote is from a user on the avsforum. One of the first links I found on google.
  2. Which ram did you try? Just the RAM or VRAM too?...

    Which ram did you try? Just the RAM or VRAM too?
    If VRAM is fine then your issue might be the graphics chip, but I'll leave that to the experts here.

    My guess would be VRAM.
  3. Sticky: Looking at this...

    Looking at this https://en.retrogamesupply.com/products/power-supply-for-sega-megadrive-genesis-1 , the original power supply is 9 to 10V and capable of delivering 1.2A.
    Your power supply is not...
  4. Sticky: I don't think changing your voltage reg would...

    I don't think changing your voltage reg would cause something like that. My guess is your power supply is under too much load.
    Anything getting hot in there when powering it up?
  5. Sticky: It's best to try with another 9V power supply...

    It's best to try with another 9V power supply just to rule out that yours is dead or not.
    Best case scenario it's your power supply.
    Worst case something is drawing to much current and that's why...
  6. Sticky: If you're only dealing with digital signals,...

    If you're only dealing with digital signals, low/high, then a cheap logic analyzer might be better (see aliexpress).
    You can probably find some schematic on google to make a digital signal out of...
  7. Did the same thing with a Sega Mega-CD that sat...

    Did the same thing with a Sega Mega-CD that sat in a corner for a year or 2, although it wasn't used for salvage parts.
    Couldn't get it to work the first days I tried and gave up. Later I managed...
  8. Sticky: 4.45V is really low IMO. What's your input...

    4.45V is really low IMO. What's your input voltage?
    Does the 5V regulator get hot, or anything else on the 5V getting hot?

    Not sure how to check the oscillator without an oscilloscope. If you...
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    As segasonicfan mentioned, you might have H-sync...

    As segasonicfan mentioned, you might have H-sync issues, but those issues can be due to bad caps not working properly and not filtering power rails or other as well as they used to.
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    20 year old CRT? Open it up and check for bulging...

    20 year old CRT? Open it up and check for bulging capacitors.
  11. Sticky: Check polarity on the capacitors you installed,...

    Check polarity on the capacitors you installed, maybe you misplaced one.
    There are schematics available online.
    Measure voltage to see if that's ok too.
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    For Sale: mega drive 2 for sale in uk ebay

    Untested Sega MegaDrive 2 for sale for our friends in the UK :...
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    That Venus Fire sounds nice, well done!

    That Venus Fire sounds nice, well done!
  14. Glad I could help :). For that blob of...

    Glad I could help :).


    For that blob of solder try using desoldering wick, costs a penny online and should do the trick.
  15. Whenever the MD is turned on, there's 9V going to...

    Whenever the MD is turned on, there's 9V going to a transistor on the Mega-CD, which switches the power going to the 5V linear voltage regulator.
    This 9V from the MD is hardwired if I remember...
  16. That looks like just a scratch on the trace. Test...

    That looks like just a scratch on the trace. Test it with your meter on diode mode.

    One thing I can see is that the 5th pin of the IC next to that scratch doesn't look like it's soldered very...
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    If I ever do that (probably not), I'd obviously...

    If I ever do that (probably not), I'd obviously use the service manual and my scope, no worries.
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    My brothers mega-CD has a similar issue where...

    My brothers mega-CD has a similar issue where when it tries to play the intro video of sonic CD it keeps trying to load but fails and stops spinning.
    I have to open the cd cover thing and close it...
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    Can't really seem to find a schematic for the CDX...

    Can't really seem to find a schematic for the CDX so it's not going to be easy to repair.
    The good thing is you have 2 ports so you can measure on the working port and compare it with the...
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    Did you open the cartridge to see if there was...

    Did you open the cartridge to see if there was any damage / corrosion inside ?
  21. I think you wouldn't want mods to be...

    I think you wouldn't want mods to be "destructive" of the motherboard. Destructive might be a big word here, but you never know who's using a soldering iron.
    Also, the mod looks fairly easy to...
  22. https://krikzz.com/forum/index.php?topic=5797.0...

    https://krikzz.com/forum/index.php?topic=5797.0 see 3rd post ?
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    Check if voltage is present on all the ICs. Even...

    Check if voltage is present on all the ICs.
    Even without CD you should see the mega cd boot up screen.
    The LED is controlled by an output of IC101, and I think only lights up when reading a disk....
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    Most inputs have input protection diodes, like...

    Most inputs have input protection diodes, like the image below.
    https://i.stack.imgur.com/NxAFI.png

    If an input is tied to 5V then the whole IC can get power from the input, through the diode....
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    Well if the button is connected to A23, you're...

    Well if the button is connected to A23, you're modifying the address bus while the game is being played.
    If the CPU tries to fetch an instruction then you're basically jumping to another point in...
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