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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?

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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 

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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 by Bolle
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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

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