What is this components which leaked?

Hello, my Macbook Air does'nt start, it looks dead, the battery is charging, I tried all the tricks I found in the forum, SMC reset … all of them.

I opened it and tried also to start with the pads, and also with the start button and discovered that the fan started to turn and stopped. Each time I push the start button the fan turns 2 seconds and stops. All that with the battery connected, or the battery disconnected and with the magsafe

.

I found that a component leaked a bit, the leak looks like brown jam.

I join a picture, the component is highlited in green (I took the picture from the site, so you won't see the leak).

I suppose that the motherboard is to be changed, I don't have the skills to change this component.

I'd like your advice.

Thanks for your help.

Hello Minho, thanks for your answer.

The logic board number is : 820-3023-A

Here is a picture where we can see the leak (and some dust) :

and another where we can see the part number of the component which is the same as the other 5 components on the side.

Do you have an idea of the price of the soldering ?

Thanks very much for your help.