leech Posted April 25, 2020 Share Posted April 25, 2020 So I've had my SC1435 since 91/92. At some point it was exhibiting a behavior where it would just flicker, and then it mostly stopped working, unless I'd put pressure down on the RGB port. I took it apart way back when and it looked like the PCB had cracked a bit around the port. Just now I checked it again after many many years, and the tube does still work, and I got a picture, though it was freaking out and had no vertical hold on it. But I still had to put pressure down on the cable for it to work, and this is after I found the rgb port was actually loose (cracked solder joints). I put some more solder on it, but I'm thinking it's still cracked in places. Might have to wait until after the world goes back to more of a 'normal', but is anyone out there good at repairing such things? Quote Link to comment Share on other sites More sharing options...
leech Posted April 26, 2020 Author Share Posted April 26, 2020 It is kind of hard to see, but there is a crack right under the SK4and it actually goes between the pins on the RGB port to the other side. So a nice line between the set of 4 and 5 pins. Doesn't look like it breaks any other traces but those. But of course according to the schematic, pin 6 is going to the composite sync (which would explain the lack of sync). The other two go to HOR(?) And VOR(?) Guessing horizontal and vertical. Pin 6 is not connected, and 1 goes to the shell, and 3,4,5 are RGB. I may just try to cut/patch the traces of the broken PCB, and see if that fixes it. Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted April 26, 2020 Share Posted April 26, 2020 Normal would be to get some ohm-meter, with which can check those lines. And more - since hardly will find some only ohm-meter, but so called unimer - universal meter, will be able to check voltages, measuring current. Such things are not so expensive today. Quote Link to comment Share on other sites More sharing options...
leech Posted April 26, 2020 Author Share Posted April 26, 2020 (edited) 2 hours ago, ParanoidLittleMan said: Normal would be to get some ohm-meter, with which can check those lines. And more - since hardly will find some only ohm-meter, but so called unimer - universal meter, will be able to check voltages, measuring current. Such things are not so expensive today. So, took the multimeter to it and a soldering iron and a rasor blade. Scrapped away the PCB coating, soldered up the connections to bridge the crack and... I got a picture! Unfortunately it is a bit blue, and our Little Green Desktop appears Yellow... So looks like I need to go back inside and fix the red color! Edited April 26, 2020 by leech 2 Quote Link to comment Share on other sites More sharing options...
leech Posted May 3, 2020 Author Share Posted May 3, 2020 On 4/26/2020 at 12:27 AM, leech said: So, took the multimeter to it and a soldering iron and a rasor blade. Scrapped away the PCB coating, soldered up the connections to bridge the crack and... I got a picture! Unfortunately it is a bit blue, and our Little Green Desktop appears Yellow... So looks like I need to go back inside and fix the red color! Successsssssss! My preciousssssss 1 Quote Link to comment Share on other sites More sharing options...
+DarkLord Posted May 4, 2020 Share Posted May 4, 2020 Gratz! Quote Link to comment Share on other sites More sharing options...
leech Posted May 4, 2020 Author Share Posted May 4, 2020 12 minutes ago, DarkLord said: Gratz! Ha, I am thinking I should have taken pictures of the work, but it was pretty ugly. The solder pads just came right off the board, so I had to improvise a bit... Quote Link to comment Share on other sites More sharing options...
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