In Samsung S3 Charging problem mostly occurs because of broken charging connector or because of having bad connection with the motherboard. So first of all you should check that Samsung Galaxy S3 Charging connector is not busted. If you are sure that it is in good condition check the general area around the motherboard where the connector is placed and clean if necessary. If problem persist then you can move on to to hardware solution as shown in the diagram below.
If cleaning does not work then replace yellow marked parts once check if the charging problem is solved in your Samsung Galaxy S3.
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Here Are Samsung Galaxy S3 Charging Problem Solution Ways. Please Observe Carefully.
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