glay78 Posted November 17, 2020 Report Share Posted November 17, 2020 Ok long story short, I connected the battery in wrong polarity, after I found out I was wrong I switched back. The portable still powers up but unable to run scsi HDD nor charge the battery. I think one mosfet could be blew but I’m not sure which. When I plugged in adapter and battery, voltage tested at battery point was 6.33v. If I do this on a working M5120 it reads 6.9v so I’m presuming the power couldn’t charge the battery hence not giving enough power to run the scsi HDD too. Can anyone enlighten me which mosfet or which component is affected? Quote Link to post Share on other sites
360alaska Posted November 17, 2020 Report Share Posted November 17, 2020 (edited) An expensive mistake, Did you check the fuse? Then, you’ll need to check the mosfets: https://www.utm.edu/staff/leeb/mostest.htm Edited November 17, 2020 by 360alaska Quote Link to post Share on other sites
glay78 Posted November 17, 2020 Author Report Share Posted November 17, 2020 Just now, 360alaska said: An expensive mistake, Did you check the fuse? Is there a fuse on the board? Quote Link to post Share on other sites
360alaska Posted November 17, 2020 Report Share Posted November 17, 2020 Near the battery power connector. Quote Link to post Share on other sites
glay78 Posted November 17, 2020 Author Report Share Posted November 17, 2020 1 minute ago, 360alaska said: Near the battery power connector. F1? Quote Link to post Share on other sites
360alaska Posted November 18, 2020 Report Share Posted November 18, 2020 Yeah F1 = Fuse 1 Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 11 minutes ago, 360alaska said: Yeah F1 = Fuse 1 My F1 is a resistor not a fuse. Quote Link to post Share on other sites
360alaska Posted November 18, 2020 Report Share Posted November 18, 2020 (edited) Whats the resistance? Should be near 0. Edited November 18, 2020 by 360alaska Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 2 minutes ago, 360alaska said: Whats the resistance? Quote Link to post Share on other sites
360alaska Posted November 18, 2020 Report Share Posted November 18, 2020 That's probably a fuseable resistor, did you check it with your meter? Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 1 minute ago, 360alaska said: That's probably a fuseable resistor, did you check it with your meter? It’s not shorted. Quote Link to post Share on other sites
LaPorta Posted November 18, 2020 Report Share Posted November 18, 2020 One thing for certain: the battery runs literally everything. The adapter simply charges the battery. If the SCSI, etc is not working, it isn’t a lack of pure power. Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 32 minutes ago, LaPorta said: One thing for certain: the battery runs literally everything. The adapter simply charges the battery. If the SCSI, etc is not working, it isn’t a lack of pure power. Currently what I assessed is with power adapter I can’t get the battery charged Quote Link to post Share on other sites
Bolle Posted November 18, 2020 Report Share Posted November 18, 2020 2 hours ago, glay78 said: It’s not shorted It’s blown then. You’ll have to replace it. Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 35 minutes ago, Bolle said: It’s blown then. You’ll have to replace it. let me test the Ohms later, it should be 23Ohms if I’m not wrong Quote Link to post Share on other sites
360alaska Posted November 18, 2020 Report Share Posted November 18, 2020 21 ohms. Quote Link to post Share on other sites
Bolle Posted November 18, 2020 Report Share Posted November 18, 2020 (edited) It's supposed to have 0 Ohms as it's a fuse and not a resistor. Violet - Black - Red edit: actually that's probably orange which would make more sense -> means it's a 7A fuse. If it's open or anything greater than 0 Ohms in resistance then it's going to be defective. Edited November 18, 2020 by Bolle Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 1 hour ago, Bolle said: It's supposed to have 0 Ohms as it's a fuse and not a resistor. Violet - Black - Red edit: actually that's probably orange which would make more sense -> means it's a 7A fuse. If it's open or anything greater than 0 Ohms in resistance then it's going to be defective. I checked continuity, it’s open. I checked for ohms and it shows 1, as the default is already showing 1 Quote Link to post Share on other sites
glay78 Posted November 18, 2020 Author Report Share Posted November 18, 2020 @360alaska @Bolle thanks guys! I changed F1 and it works now!!! Quote Link to post Share on other sites
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