Djoulz Posted April 26, 2019 Share Posted April 26, 2019 Hello, I did the TFW8Bit Composite Mod on my 2600 4 switch Vader PAL. The image is now still without fuzzyness so the composite seems to be OK, but the video very dark on a CRT and unreadable on a LCD. It seems that the signal needs some power up, I've also tested it on an old LG 4/3 LCD and it even refuse to recognize the signal Did I miss something ? Did you already witness those kind of issue ? So thank you in advance Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted April 26, 2019 Share Posted April 26, 2019 Is there by chance a 75r resistor that is tied to video out and ground either at the RCA jack you installed or as part of the mod board? This resistor was standard on the 2600 composite mods for when using with a CRT, but I've found that it reduces the signal too much on some LCDs and they don't care for it. As such, they tend to produce a much darker picture. Not saying this is the cause, just curious if you see or know if that is part of the AV kit you've installed and if so, what happens if you remove it from circuit? 1 Quote Link to comment Share on other sites More sharing options...
Djoulz Posted April 26, 2019 Author Share Posted April 26, 2019 Yep Cros (I call you like that because my keyboard lake some keys to spell your name), the mod I bought is : https://www.thefuturewas8bit.com/deluxe-atari-composite-video-mod.html Wich is the samller version of: https://www.thefuturewas8bit.com/atari-composite-video-mod.html And it seems to have the famous 75R you mention ... ... pfff in fact I don't know how to remove this R Quote Link to comment Share on other sites More sharing options...
Osgeld Posted April 26, 2019 Share Posted April 26, 2019 (edited) just short it out with a blob of solder (actually that's an easy way to remove chip parts like that but you still need to short it) Edited April 26, 2019 by Osgeld Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted April 27, 2019 Share Posted April 27, 2019 Yeap...just hit it with a blob of solder and you should be able to take it totally off the little board. Then you just need to jump those pads together. Quote Link to comment Share on other sites More sharing options...
Djoulz Posted April 27, 2019 Author Share Posted April 27, 2019 I think I will build a small test circuit before destroying the one I paid Do you know where I can find some schema ? Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted April 28, 2019 Share Posted April 28, 2019 Well you could just use part of a lead off a component and just solder it to both sides of the resistor as a jumper to essentially bypass it without removing it. That is what Osgeld was suggesting above. Quote Link to comment Share on other sites More sharing options...
Djoulz Posted April 28, 2019 Author Share Posted April 28, 2019 Errr, yes, but it's very small SMD component, and my old hands or not so sure Quote Link to comment Share on other sites More sharing options...
Djoulz Posted April 28, 2019 Author Share Posted April 28, 2019 Yop ! I did it So I desoldered the (very) small SMD 75R and make a solder link between the two. pads ... And no image at all, black screen ! I soldered back the resistor, and here is my dark image again Quote Link to comment Share on other sites More sharing options...
Osgeld Posted April 28, 2019 Share Posted April 28, 2019 most of the time those things are in series with the video output, I guess it could have one side grounded Quote Link to comment Share on other sites More sharing options...
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