The Inspiron 9300 is very similar to the 6000, 6400, E1505, and E1705 laptops among others. They all fall victim to the dc jack problem and are very common for this repair.
This laptop came in with the symptom of being able to wiggle the jack or position it the right way to make it charge. Dell had already replaced the ac adapter and system board once under warranty. Of course now that the laptop is out of warranty a new system board is pricey and unnecessary.
The laptop was torn down and you could see the two voltage pins had cracked where the solder meets. This gives the laptop the wiggle effect to make it charge.
As always the jack was replaced (could have been re-soldered) and the jack now feels very solid when plugged in. Make sure you add enough solder to the data pin so the motherboard can know what type of adapter is plugged in.
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