TechCowboy Posted January 1, 2019 Share Posted January 1, 2019 I had just done a McWill update and everything was working great. It ran fine for a few hours and a few on/off cycles, then I couldn't turn the Lynx on. I assumed the MOSFET has failed, ordered a couple, put it in and then POP, TP18 blew up real good! Perhaps I didn't purchase the right MOSFET, or just a coincidence? This is the MOSFET I ordered from Digikey: NDT2955CT-ND NDT2955 MOSFET P-CH 60V 2.5A SOT-223-4 Assuming nothing else blew and I have the right part, I've heard there was a zener diode I should be replacing as well, but I don't know which one or it's value. I, of course, need to replace TP18 -- what part is that? Thanks in advance to you all. Quote Link to comment Share on other sites More sharing options...
+Stephen Moss Posted January 1, 2019 Share Posted January 1, 2019 Anything labled TP is a test point- a hole/pad on the PCB provided for the convenient measurement of key voltages/signals in the circuit and so cannot blow up. From the image it looks like a transistor, possibly labled Q8, but being at home this week I cannot check as both my Lynx II and circuit diagram are at work. The MOSFET/Zenner and equivalent replacements have been discussed here many times, a search of the forum should provide the answer you need. Quote Link to comment Share on other sites More sharing options...
Lynxman Posted January 1, 2019 Share Posted January 1, 2019 I hope nothing else damaged... You should install a 5V Mod to avoid such issues... Quote Link to comment Share on other sites More sharing options...
Igor Posted January 2, 2019 Share Posted January 2, 2019 I hope nothing else damaged... You should install a 5V Mod to avoid such issues... Are you talking about this? http://atariage.com/forums/topic/245901-usb-to-lynx-powerac-connector/ I tried to look for a definitive guide on how to do a 5V mod, but couldn't find it, can you share please? Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted January 2, 2019 Share Posted January 2, 2019 I had just done a McWill update and everything was working great. It ran fine for a few hours and a few on/off cycles, then I couldn't turn the Lynx on. I assumed the MOSFET has failed, ordered a couple, put it in and then POP, TP18 blew up real good! Perhaps I didn't purchase the right MOSFET, or just a coincidence? This is the MOSFET I ordered from Digikey: NDT2955CT-ND NDT2955 MOSFET P-CH 60V 2.5A SOT-223-4 Assuming nothing else blew and I have the right part, I've heard there was a zener diode I should be replacing as well, but I don't know which one or it's value. I, of course, need to replace TP18 -- what part is that? Thanks in advance to you all. Look like Q8 is what went out. The Diode is directly above where it is labeled as D13 in your pic. I always advise that before installing the McWill on your Lynx that you always go and replace the parts that come in this kit to be sure the power regulation is good for a long while more: https://console5.com/store/atari-lynx-1-2-voltage-regulator-rebuild-refresh-kit-with-power-jack.html Quote Link to comment Share on other sites More sharing options...
Lynxman Posted January 2, 2019 Share Posted January 2, 2019 Are you talking about this? http://atariage.com/forums/topic/245901-usb-to-lynx-powerac-connector/ I tried to look for a definitive guide on how to do a 5V mod, but couldn't find it, can you share please? http://atariage.com/forums/topic/236279-what-are-the-5v-regulator-mod/ 1 Quote Link to comment Share on other sites More sharing options...
Igor Posted January 5, 2019 Share Posted January 5, 2019 http://atariage.com/forums/topic/236279-what-are-the-5v-regulator-mod/ Thanks. There's a lot of discussion on that thread but no final step by step guide on how to do it. Looks like different people took slightly different approaches. I might have to write up a guide at some point after trying it out myself. Quote Link to comment Share on other sites More sharing options...
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