They can solder and desolder parts very quickly without taking any risk for the rest of the components. If you are a total beginner in electronics better take your computer to a repair shop to avoid causing more damage to it, even if it costs you a little bit. Then you will go on and check the circuitry : coils, mosfets, capacitors, inductors, etc.
It's important to proceed step by step instead of quickly replace parts like RAM or graphics chip or even the processor, first thing first check if your charger is working. Does your laptop have any issue with the disply, or the power? Start with the basics by measuring the voltage at all the measuring points showed in the repair guide, and come back with all the measures so we can help you fix your Dell Studio One 19 1909. Depending on the problem it won't be the same approach. Don't jump into the repair book and chip level right away.
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