Chosen Solution
Last week I replaced the LCD on my iPhone 4 with a Complete LCD Screen Assembly that I purchased at www.chinaontrade.com. After replacing the LCD, my iPhone 4 works great again, except for the battery life which runs empty very quickly now. Did I do something wrong, or could the battery drainage be caused by the new LCD? Regards Erik.
If there isn’t much drainage in Airplane mode, then it does sound like the battery drain is due to antenna issues. GSM (and 3G) phones negotiate signal strength with the tower, and will use the minimum transmit power necessary for the tower to decode the signal – so a weak GSM signal at home would increase power usage, as would any other problem with the antenna. iFixit mentions that finger oils that get deposited on interior surfaces of the phone can cause antenna problems, so you should follow the teardown guide through step 7, where they talk about cleaning the contacts with Windex.
I am more likely to think, that a cheap screen could be the issue? If the phone has reception and has the normal amounts of bars in a situation where you know it should have that many bars then I would exclude the the antenna problem. That would be the case if the phone is constantly trying to connect to a network. Or apple has made their devices sense that a non original part is fitted in and the new parts become voltage vampires. Could it be that the battery may shorted circuited ?
