INTV123 Posted February 23, 2020 Share Posted February 23, 2020 I noticed that when my mod board is connected the 12v connection for the rf modulator drops to like 4v. also noticed that when its disconnected it's still only like 11.4v. And one of the chips on the board gets very hot. I'm wondering if this is why after a few seconds of use the picture becomes less stable (text characters basically shake) Also i took the cage off the rf modulator to make room so not sure if that has anything to do with my problem. been trying to get this thing to work for so long its kind of annoying. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted February 23, 2020 Share Posted February 23, 2020 It does sound like your mod board has a short on it somewhere. What are you using for the mod? Quote Link to comment Share on other sites More sharing options...
INTV123 Posted February 24, 2020 Author Share Posted February 24, 2020 3 hours ago, ChildOfCv said: It does sound like your mod board has a short on it somewhere. What are you using for the mod? using this mod. Even without it though, the rf causes a drop. I relised that i didn't have the ground connected and when i did it fell even more to like 6v Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted February 24, 2020 Share Posted February 24, 2020 (edited) The service manual says that the voltage at pin 2 of the modulator should be 6V. So that sounds normal. So you're using the traditional mod. Did you order it or build it yourself? You should probably check it for solder blobs and such. Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal. And of course the most important question: Without the mod hooked up, does the video distort? Edited February 24, 2020 by ChildOfCv Quote Link to comment Share on other sites More sharing options...
INTV123 Posted February 24, 2020 Author Share Posted February 24, 2020 5 hours ago, ChildOfCv said: The service manual says that the voltage at pin 2 of the modulator should be 6V. So that sounds normal. So you're using the traditional mod. Did you order it or build it yourself? You should probably check it for solder blobs and such. Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal. And of course the most important question: Without the mod hooked up, does the video distort? i wasn't getting any signal without the mod. its one i made myself and i checked for shorts before i hooked it up, but i figured it woudn't do anything if there was a problem. Quote Link to comment Share on other sites More sharing options...
INTV123 Posted February 24, 2020 Author Share Posted February 24, 2020 5 hours ago, ChildOfCv said: The service manual says that the voltage at pin 2 of the modulator should be 6V. So that sounds normal. So you're using the traditional mod. Did you order it or build it yourself? You should probably check it for solder blobs and such. Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal. And of course the most important question: Without the mod hooked up, does the video distort? so... the cap on the video input side is measuring a short. that may be the problem; ill have to go buy a new cap to replace it with and see if that works. just wondering how it died in the first place? Quote Link to comment Share on other sites More sharing options...
INTV123 Posted February 24, 2020 Author Share Posted February 24, 2020 7 hours ago, ChildOfCv said: The service manual says that the voltage at pin 2 of the modulator should be 6V. So that sounds normal. So you're using the traditional mod. Did you order it or build it yourself? You should probably check it for solder blobs and such. Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal. And of course the most important question: Without the mod hooked up, does the video distort? Never mind, didn't change anything. i checked the voltages on the transistors and they are similar but not exactly the same as what was listed on the wiki. Quote Link to comment Share on other sites More sharing options...
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