This is my first post. I hope you guys find this info helpful.

Instead of spending $500 buying a used navigation LCD or $1200 buying a new one. You can try to replace just the LCD.

I had a navigation LCD with dead pixels and grey spots. I followed the instruction posted under navigation->topic 15. Went one step further and detach the LCD screen (4 more screws and two cables). The LCD screen is a Sharp LQ065T9BR51 (or minor variations).

Spent a lot of time googling and found a reseller in China that sell this LCD. They are willing to sell one unit instead of the standard 500 unit lot. They also take paypal and will ship the unti to you relatively fast using DHL.

Seller:www.kecotech.com
Cost: $165 including shipping
LCD: LQ065T9BR53U (New revision works exactly the same as the old one)