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MSX 1 Help: Bad/Glitch Video Signal

msx help bad glitch video signal troubleshooting philips vcr dvd

2 replies to this topic

#1 artcloud OFFLINE  

artcloud

    Combat Commando

  • 8 posts
  • Location:Weert, The Netherlands

Posted Tue Oct 4, 2016 6:02 AM

Hey all,

I recently purchased a Philips VG8020/00 MSX Home Computer. I'm having some trouble getting a decent video signal out of the thing. When I hook it up to my VCR/DVD Combo via the RF out and convert the signal into composite, I get a glitchy screen, jumping from left to right, going from color to black and white. However, the MSX boot up text is present, and when I press keys on the keyboard, they do get added to the screen.
MSX Glitch 1.JPG  MSX Glitch 2.JPG  MSX Glitch 3.JPG  MSX Glitch 4.JPG  MSX Glitch 5.JPG
I used the automatic tuning options on my VCR/DVD combo, but it sadly does not improve the quality. I also tried connecting a Sega Mega Drive RGB connector to the Monitor out on the computer, but that didn't do anything apart from making some pop noises. I might have to get a different cable to test that out. I also know for sure that my set-up isn't the problem; I've connected other coaxial game-consoles the same way (Atari 2600, Videopac G7000) and they all work.

The unit looks fine and all (no mayor external damage). What I did notice though, was some noises inside the machine when I held it sideways; there could be some dirt in there. Also, some buttons get stuck from time to time (especially the directional buttons). I'll open it up and give it a good clean one of these days.

Has anyone here experienced similar problems and got them solved? Any help or advice would be greatly appreciated! I hope the damage (if it has any) is not to severe; would be awesome to get it up and running again!

Thanks! :)


Edited by artcloud, Tue Oct 4, 2016 6:05 AM.


#2 carlsson OFFLINE  

carlsson

    Metagalactic Mule

  • 5,220 posts
  • Location:Västerås, Sweden

Posted Tue Oct 4, 2016 7:06 AM

The monitor connector only contains composite video, not RGB. If you have got a cable made for Commodore, Atari etc you will get a B&W image. A cable made for Mega Drive etc will feed 5V into the video input on your TV, which is not what you desire. You could make a special cable for the MSX that uses pins 2 (ground), 3 (audio), 5.(composite video).

 

http://www.faq.msxne...or.html#monphil



#3 matthew180 OFFLINE  

matthew180

    River Patroller

  • 2,412 posts
  • Location:Castaic, California

Posted Wed Oct 5, 2016 8:59 PM

You could replace the 9918A VDP with an F18A.





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