When i charge my laptop samsung rv509 my laptop charge but light does not appear and the left and right button of touchpad does not work when charging the computer.

SOURCE: how to adjust screen brightness in samsung rv509

You should be able to check the function keys (F1-F12) and one of them should have a little symbol, it will look like a sun (circle with lines radiating out from the circumference) and a little up arrow, it will probably be right next to one with the sun and a little down arrow. Press the "Fn" key (right next to the left windows key) and hold it down, then tap the "sun up" key. That will raise your brightness.

If you want to raise it permanently, go into the Power Control Options in the Control Panel and find the setting for screen brightness.

SOURCE: samsung p510 left clicker isn't responsive. I am having to double tap the touchpad in the mean time. What is this part called on a laptop?

The left button, buy a can of compressed air attach straw and lift left button with fingernail gently, now give a few good blasts to clear out any dirt that might be obstructing the pad underneath the button, repeat if needed.

SOURCE: samsung r519 charging port problem

Try someone elses charger in your pc, if same fault, its your pc

SOURCE: Why my samsung laptop n150 plus is only charging 80% still i put on charge after 80%?it only show green light after 80% which means that laptop not going to charge after 80%...WHY?

If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.

SOURCE: samsung NP-R480l laptop not charging

When you connect the power adapter into the laptop, does the power LED light up? If not then - The battery adapter or the adapter's power lead or the laptop's power socket could be faulty. Check power adapter's DC plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard. This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.