The obvious place to start is right here at iFixit:
[product|IF188-005|MacBook Air 1.6 GHz (Original) Logic Board ]
[product|IF188-007|MacBook Air 1.8 GHz (Original) Logic Board ]
[product|IF188-027|MacBook Air 1.6 GHz (Late 2008) Logic Board ]
[product|IF188-040|MacBook Air 1.86 GHz (Mid 2009) Logic Board ]
[product|IF188-042|MacBook Air 2.13 GHz (Mid 2009) Logic Board ]
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Your serial number indicates that your computer is a Mid-2009 Macbook Air, so you should really stick with logic boards from that generation (1.86 GHz/661-5197, 2.13 GHz/661-5198) for best compatibility.
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Your serial number confirms that your computer is a Mid-2009 Macbook Air, so you should really stick with logic boards from that generation (1.86 GHz/661-5197, 2.13 GHz/661-5198) for best compatibility.
If the prices for the iFixit boards are out of your range, you can try the [http://www.ebay.com/sch/i.html?_nkw=661-5198|online auction site eBay] as jeffhogancamp suggests, or [http://www.google.com/search?client=safari&rls=en&q=661-5198&ie=UTF-8&oe=UTF-8|use the part number as a search term in the Google search engine] to find a retailer closer to you, as Dan and mayer suggest. This method is no different from Googling for anything else; you simply use the part number as the search term.
Parts from iFixit have been tested, and come with a replacement warranty for parts that don't work. Other sources may not check their parts as carefully, or offer any warranty at all. You should check the terms of the sale carefully before you buy. All these logic boards are used, so a warranty is your only real protection against paying for a logic board that's just as dead as the one you're replacing. A warranty is only as good as the seller who gives it to you, so pick your seller wisely.
As for installation guides, the logical one to look at is iFixit's replacement guide.
[guide|854]
What's wrong with the old logic board that you need to replace it? If we have more details on the problem, we may be able to suggest less expensive solutions. For example, you can often recover from a liquid spill by washing the logic board in purified alcohol.
The obvious place to start is right here at iFixit:
[product|IF188-005|MacBook Air 1.6 GHz (Original) Logic Board ]
[product|IF188-007|MacBook Air 1.8 GHz (Original) Logic Board ]
[product|IF188-027|MacBook Air 1.6 GHz (Late 2008) Logic Board ]
[product|IF188-040|MacBook Air 1.86 GHz (Mid 2009) Logic Board ]
[product|IF188-042|MacBook Air 2.13 GHz (Mid 2009) Logic Board ]
Your serial number indicates that your computer is a Mid-2009 Macbook Air, so you should really stick with logic boards from that generation (1.86 GHz/661-5197, 2.13 GHz/661-5198) for best compatibility.
If the prices for the iFixit boards are out of your range, you can try the [http://www.ebay.com/sch/i.html?_nkw=661-5198|online auction site eBay] as jeffhogancamp suggests, or [http://www.google.com/search?client=safari&rls=en&q=661-5198&ie=UTF-8&oe=UTF-8|use the part number as a search term in the Google search engine] to find a retailer closer to you, as Dan and mayer suggest. This method is no different from Googling for anything else; you simply use the part number as the search term.
Parts from iFixit have been tested, and come with a replacement warranty for parts that don't work. Other sources may not check their parts as carefully, or offer any warranty at all. You should check the terms of the sale carefully before you buy. All these logic boards are used, so a warranty is your only real protection against paying for a logic board that's just as dead as the one you're replacing. A warranty is only as good as the seller who gives it to you, so pick your seller wisely.
As for installation guides, the logical one to look at is iFixit's replacement guide.
[guide|854]
What's wrong with the old logic board that you need to replace it? If we have more details on the problem, we may be able to suggest less expensive solutions. For example, you can often recover from a liquid spill by washing the logic board in purified alcohol.