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I have this LCD display: RC0802A-BIW-CSX

It is supposed to have a backlight, but I can't understand where the backlight LED is since the connections are just 14 pin, and backlight is not mentioned. Any idea?

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    \$\begingroup\$ If you have it physically, then you could show a photo. I am sure these kinds have visible backlight pins. \$\endgroup\$ – PlasmaHH Mar 26 '17 at 20:03
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connections are just 14 pin, and backlight is not mentioned

The backlight LED connections are not on the same connector. They are on the opposite side of the module.

drawing from the datasheet
(drawing from p.7 in the datasheet)

Such an arrangement is not uncommon for character LCDs. Here's another example.

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A backlight is mentioned in many places, but that doesn't help. They don't show the connection in detail.

Page 7 shows two letters, A and K, on one side of the LCD. That's the backlight. It doesn't show how and where they are, or how to connect to it.

Page 12 has the electrical characteristics for the backlight. Apparently it's a pretty standard white LED, they want you to drive it with a current of 16 mA, and then it will develop about 3.5 V.

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