Hi.I replaced a ipod touch 4th gen LCD and screen, but after connecting the new part, the the screen turn white no picture,when i connected to the computer it shows the pictures i have on it,i keep pushing the power botton and home botton and nothing happen i removed the cable still nothing it is almost 3 weeks still doesn't coming back.Does any body any idea what t do with it is there any fix in this case.Any information is very welcome.Thank you