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A little check list of some basic things to ask yourself before asking such a question:

- Is this some manner of high/mains voltage device? Repairing such electronics is very dangerous if you don't know what you are doing. In particular, unplugging the power cord doesn't mean that the device is now safe. 
- Do you have the necessary tools for trouble-shooting? In this case the minimum is a multi-meter, a soldering iron, some tweezers and/or flat nose pliers depending on component size. Preferably also an oscilloscope.
- Do you know how to use the above tools with some confidence? In particular, if you are repairing a surface-mount board (which is the most likely case), do you have experience soldering such boards?
- Do you have basic ESD awareness? Consumer electronics PCBs are often easy to break with ESD.