iPhone screen goes white and remain uncharging

I've been using this iphone for more than 1 and a half year.i had no problems in thiss phone.but before one month my power button did not work properly , so i thought of changing it and i changed it and i changed the earpiece also.. now the power button is working properly but still the earpiece is not working properly i cannot hear properly what others speak over the phone.. and when i was above

To fix the black plate i couldnt close it properly its stucks ..then the battery cable teared and i had to buy a new battery and replace ($12).. after replacing that battery when i plug the charger to the wall socket iphone doesnt charge it remains uncharging and restarts automatically..the screen goes white with a black line in the middle of the screen ..i thought that was an shortage in the iphone..

Can anyone of you'll please help me to get rid out of this problem ...

My brother told that due to my careless fixing of iphone i would have damaged the internal parts ...but i did not do so....

Can anyone of ur'll tell whats the problem with my iphone ..?????