Replace cracked LCD screen and digitizer of iPhone 3GS

[WK95]

I have a problem of repair my digitizer and LCD screen on my iPhone 3GS,before that I crashed my iPhone,the touch screen won't work,but I still can see my wallpaper and the lock screen
BUT once I replace the LCD and digitizer which is take out from another iPhone 3GS,the whole just go white...what's wrong?!

 

[nshattuck]

See if newer iOS iteration is needed for that screen

This may not be the problem, but try making sure you're phone is updated to the latest current iOS version available for that model. I've heard that if the replacement screen/digitizer was from a phone with a later manufacturing date (even though the same iPhone model) it may require a later iteration (NOT necessarily a whole new version of iOS - like iOS 4 vs iOS 5, but a later iteration within iOS 4, like updating to iOS 4.2.1 from 4.01). I hope that makes sense and happens to solve your problem.