Polish.Gasoline Posted September 10, 2019 Share Posted September 10, 2019 Just wondering if these parts commonly go on a intv model 1. Mine works but the board is black. It's the two black parts. Just want to know in case I have to order parts in the future. Quote Link to comment Share on other sites More sharing options...
mr_me Posted September 10, 2019 Share Posted September 10, 2019 Yes those transistors have been known to fail. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted September 10, 2019 Share Posted September 10, 2019 It is interesting as I've worked on many intellivision model 1 units and I've honestly never seen any with that cooked PCB near those transistors myself. Although I've seen plenty of pics from others that have. It makes me wonder if the ones I've serviced are newer and didn't have this issue with the heat on those transistors or if the ones I've come across were powered on in use in better ventilation during their lives? 1 Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted September 10, 2019 Share Posted September 10, 2019 There's a further possible issue with PCBs too: Once they start burning like that, the fiberglass material becomes conductive, making the board itself into a resistor. You can check that with multimeter probes, touching different areas within a burn to measure resistance. If there's a reading that's significantly lower than infinity, the only possible remedy (other than replacing the board) is to cut out the burnt area and build a daughterboard with the parts that are supposed to go in that area. Quote Link to comment Share on other sites More sharing options...
Polish.Gasoline Posted September 11, 2019 Author Share Posted September 11, 2019 (edited) 15 hours ago, mr_me said: Yes those transistors have been known to fail. How does this happen? Where can i buy one? 10 hours ago, ChildOfCv said: There's a further possible issue with PCBs too: Once they start burning like that, the fiberglass material becomes conductive, making the board itself into a resistor. You can check that with multimeter probes, touching different areas within a burn to measure resistance. If there's a reading that's significantly lower than infinity, the only possible remedy (other than replacing the board) is to cut out the burnt area and build a daughterboard with the parts that are supposed to go in that Appears I caught it in time. There is no major damage. Edited September 11, 2019 by Polish.Gasoline Quote Link to comment Share on other sites More sharing options...
Polish.Gasoline Posted September 11, 2019 Author Share Posted September 11, 2019 14 hours ago, -^Cro§Bow^- said: It is interesting as I've worked on many intellivision model 1 units and I've honestly never seen any with that cooked PCB near those transistors myself. Although I've seen plenty of pics from others that have. It makes me wonder if the ones I've serviced are newer and didn't have this issue with the heat on those transistors or if the ones I've come across were powered on in use in better ventilation during their lives? Maybe some are left on for too long is my guess. Quote Link to comment Share on other sites More sharing options...
mr_me Posted September 11, 2019 Share Posted September 11, 2019 (edited) You can find the transistor type here. https://atariage.com/forums/topic/278865-advice-needed-on-repairing-a-motherboard/ Edited September 11, 2019 by mr_me 1 Quote Link to comment Share on other sites More sharing options...
rmzalbar Posted September 21, 2019 Share Posted September 21, 2019 I have the same burn marks on mine. They are both 2N3906, a very common PNP transistor. They amplify a clock signal to a fairly high voltage. Although my board worked fine, I replaced them when I did a capacitor job because my assumption is that if they were getting that hot, they may have been failing and leaking too much current. 1 Quote Link to comment Share on other sites More sharing options...
+save2600 Posted September 21, 2019 Share Posted September 21, 2019 Affixing little heatsinks to those (especially the original) transistors might not be a bad idea. I've done so in audio applications where they work extremely well. 2 Quote Link to comment Share on other sites More sharing options...
Speedman Posted October 22, 2019 Share Posted October 22, 2019 I've also had that on my board and swapped them out for new ones, but still the new ones get extremely hot, about 145*f when i measured the. I have other issues that need to be check on my board as after 15 minutes it goes black and already changed caps, power transistors, cpu transistors etc... but i'll leave that for another post! Quote Link to comment Share on other sites More sharing options...
Polish.Gasoline Posted October 25, 2019 Author Share Posted October 25, 2019 (edited) The guy at console 5 says it's quite a strange problem to have on the console. I'm ordering a cap kit anyways with the other transistors. My system is fine other than that. It just a little burnt on the chip I just wanted to replace it so it wouldn't get worse. Like someone already said when it gets burnt it gets conductive and that's what I am afraid of. I don't want to do surgery on a board and Frankenstein the thing if I don't have to. I don't know if the console got left on too long if that had caused it don't know but it works without a problem when I play it. I hacked a cord on one of the controllers cause it was giving me some input problems when tugged. It works fine now. After this I'll leave it alone. Edited October 25, 2019 by Polish.Gasoline Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.