Unfortunately, some power supplies advertise that they can output a good amount of current but fail to do so. You will also reduce the operating life of the device, although this can be hard to quantify. If you use your Raspberry Pi when it is operating above its recommended temperatureyou may also experience freezes.
If you use your Raspberry Pi with an insufficient power supplyyou may experience the following problems. This has now been changed to some more easily recognisable iconography. This can cause filesystem corruption which can result in data loss or improper system function. Further, the device will be subjected to unexpected shutdowns and will be improperly powered down whenever your TV is turned off.
By powering the Raspberry Pi from your TV, you will not provide it with enough power which will cause poor system performance and freezing. It should be noted that at the time of writing, you still need a small SD card for the boot files to remain on.
Further, library artwork and the installation of apps and add-ons will soon mean that space gets used fast. Some of this memory is allocated to the GPU and thus running commands such as free or top will show less available memory than you may expect.
