Connecting 12v for standalone unit.

After Connecting diodes into the d1 and d2 position. It ahould be a plug and play unit with my lcdscreen and sd reader?

If the diode has a silver band dictating the cathode. On the diagram. Which way does the diode face. Towards arrow with silver band at bottom of triangle?;

Which way does diode need to face?

And i should install diode in bith d1 and d2?

Does anyone have pictures of installed diodes?

Will it intefere with still using usb connection?

Using ramps1.4 and mega2560 for my i3-rework.
Also using full graphics controller and 30a power supply

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pushthatbolder
If the diode has a silver band dictating the cathode. On the diagram. Which way does the diode face. Towards arrow with silver band at bottom of triangle?

The diode symbol points an arrow at a line. The line is the band on the physical component.

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Which way does diode need to face?

Refer to this image: [reprap.org]

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And i should install diode in bith d1 and d2?

Definitely d2. Skip D1 if you're powering it by more than 12V or you want/need to power the Arduino by means of something other than the Ramps board.

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Does anyone have pictures of installed diodes?

Google image search is your friend.

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Will it intefere with still using usb connection?

No.