***[link|https://www.ifixit.com/User/4030663/Chris+Cameron|Chris Cameron|new_window=true] that is usually caused by corrosive materials destroying the nickel and thus losing conductivity. You could try and use some isopropyl alcohol and cotton swab to clean it. Then you will need something slight abrasive to remove the pitting of it. Try a thin stiff brush or a hard (smoking)pipe brush. Something [https://www.harborfreight.com/tube-brush-set-6-pc-61923.html?utm_source=bing&utm_medium=cpc&utm_campaign=425671831&campaignid=425671831&utm_content=1168781886898989&adsetid=1168781886898989&product=61923&store=&msclkid=1ac14b744651155f806629eb15b360ce|like this] always comes in handy.***
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[link|https://www.ifixit.com/User/4030663/Chris+Cameron|Chris Cameron] that is usually caused by corrosive materials destroying the nickel and thus losing conductivity. You could try and use some isopropyl alcohol and cotton swab to clean it. Then you will need something slight abrasive to remove the pitting of it. Try a thin stiff brush or a hard (smoking)pipe brush. Something [link|https://www.harborfreight.com/tube-brush-set-6-pc-61923.html?utm_source=bing&utm_medium=cpc&utm_campaign=425671831&campaignid=425671831&utm_content=1168781886898989&adsetid=1168781886898989&product=61923&store=&msclkid=1ac14b744651155f806629eb15b360ce|like this] always comes in handy.
***[link|https://www.ifixit.com/User/4030663/Chris+Cameron|Chris Cameron|new_window=true] that is usually caused by corrosive materials destroying the nickel and thus losing conductivity. You could try and use some isopropyl alcohol and cotton swab to clean it. Then you will need something slight abrasive to remove the pitting of it. Try a thin stiff brush or a hard (smoking)pipe brush. Something [https://www.harborfreight.com/tube-brush-set-6-pc-61923.html?utm_source=bing&utm_medium=cpc&utm_campaign=425671831&campaignid=425671831&utm_content=1168781886898989&adsetid=1168781886898989&product=61923&store=&msclkid=1ac14b744651155f806629eb15b360ce|like this] always comes in handy.***