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When i want to do laptop maintenance i want to ground myself with anti-static wrist strap. But how do i ground myself to laptop? Where can i find grounding point in order to not make mistake and spoil something?

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You do not want to ground yourself to the laptop. You want to be grounded to earth.

The anti-static wrist strap should have come with an attached wire. The other end of that wire should be connected to an electrical ground. The center screw of the AC wall outlet holding the cover plate is a suitable connection point that is tied to your dwelling's ground (assuming you have 3-prong outlets and the outlet is properly wired and up to code). Make sure you attach to bare metal and not the paint on the screw.

Once you are grounded, you do not want to touch any live circuit. So the equipment should be turned off and unplugged. Ideally, especially with high voltage devices, you should use the hand that has the strap to poke around and the other hand behind your back or in your pocket. The idea is that if you do get shocked, the electrical current only has a path from your hand to the strap, and not across your chest and heart.

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But i heard i can ground to laptop which is plugged in AC outlet while shut down. This is not true? – Boris_yo Aug 11 '11 at 10:56
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No, you cannot ground to a laptop connected to an AC outlet - the laptop's power-supply is where the connection to the electrical earth stops, there is no electrical earth within the laptop chassis. You should always connect your wrist strap directly to an electrical earth and never to the equipment you are working on, regardless of whether it's a laptop, desktop etc. – Mike Insch Aug 11 '11 at 11:23
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