First use external monitor to see if you have the same problem. If the external monitor works well, it is definitely an LCD display problem. Blinking can be caused either by problem with a light bulb (it is located inside screen), inverter, or video ribbon cable. You may try first to re-set the video connector. But in any case you need to open your notebook first. If re-setting video connector does not help, the solution is to replace the screen and inverter (normally, LCD screen and inverter sell together). You may use some online illustrated guide to learn how to do this. Good luck!
Unlike the CRT monitor, LCD doesn't use as much power. So, the battery of the laptop is enough to power its LCD monitor. There is a power supply cables within the laptops. That cables carry the power from the battery to its LCD monitor and other power needed devices. It is the simplest answer of how is the LCD on the laptop powered?
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