Atari_Falcon Posted January 21, 2011 Share Posted January 21, 2011 Hi, I found another thing with my new Atari 7800: I get a (relative) sharp picture on my TV, but the sound is VERY noisy. Even fine adjusting doesn't fix that. Is there some "screw" on the board I can adjust it when opened the system? Thanks in advance for your help, Chris Quote Link to comment Share on other sites More sharing options...
GroovyBee Posted January 21, 2011 Share Posted January 21, 2011 If you leave the system powered on for 20 minutes or so and fine tune again does the problem go away? Quote Link to comment Share on other sites More sharing options...
Atari_Falcon Posted January 21, 2011 Author Share Posted January 21, 2011 If you leave the system powered on for 20 minutes or so and fine tune again does the problem go away? I will check that! Quote Link to comment Share on other sites More sharing options...
The_Laird Posted January 21, 2011 Share Posted January 21, 2011 Exactly what I was going to suggest, my 7800 has that problem. Quote Link to comment Share on other sites More sharing options...
Atari_Falcon Posted January 21, 2011 Author Share Posted January 21, 2011 And what is the problem with the machine? I mean, will, after 20 minutes, the problem be gone and when I power it on the next time, do I have to wait again 20 seconds? Quote Link to comment Share on other sites More sharing options...
GroovyBee Posted January 21, 2011 Share Posted January 21, 2011 It has to do with the age of the components whose tolerances and characteristics change over time (in this case a couple of decades). Leaving the unit powered on means that the components will get slightly warmer and thus bring them more into their original specification. Quote Link to comment Share on other sites More sharing options...
Atari_Falcon Posted January 21, 2011 Author Share Posted January 21, 2011 Okay, I see, but there is no way to adjust this (I had similar issues with a 130 XE where I could), right? So it is just "normal". It's interesting, too that this machine has no channel select button... Quote Link to comment Share on other sites More sharing options...
GroovyBee Posted January 21, 2011 Share Posted January 21, 2011 Okay, I see, but there is no way to adjust this (I had similar issues with a 130 XE where I could), right? So it is just "normal". It's interesting, too that this machine has no channel select button... You could probably change the components . All the retro PAL machines I have display on channel 36. That was pretty standard back in the day. Quote Link to comment Share on other sites More sharing options...
kool kitty89 Posted January 22, 2011 Share Posted January 22, 2011 I have a genesis that does the same thing, great picture and really staticy audio via RF... the wierd thing is that that only applies to some TVs, the ~2004 flat CRT Sanyo has extremely clear sound via RF and clean video... I think there may be some drift in the sound and video signals in RF that only some TVs compensate for (separate fine tuning for sound and video modulated in RF). I'm pretty sure that oddity is a capacitor problem given the same console is highly unstable with my Sega CD (crashes it when left on a while while other Geneses don't)... but aside from replacing all the caps (tedious but prudent) a simpler solution for the 7800 would be an AV mod. (at least until other cap issues appear -which may take many years to manifest, especially if it's a gradual drying issue and not a leaking one) Quote Link to comment Share on other sites More sharing options...
Atari_Falcon Posted January 22, 2011 Author Share Posted January 22, 2011 Okay, I checked... NOTHING happens, no matter how long I let it run... BUT on my other TV (TFT) it´s the other way round: Sound is crystal clear, but picture has shadows... :/ It´s worst with 2600 games, 7800 games have a little better picture AND the bad picture is effected by pushing the cartridge a little... Quote Link to comment Share on other sites More sharing options...
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