Can you check the date in settings? I had the same problem before on phones and iPads, after disconnecting the battery, all of them jumped back to the default date (1970, XX, XX). After setting the date properly, i was able to use all the web stuffs.
Hello. I think the fault is most probably in the DC board, or somewhere in the SMC circle. If the battery is causing open/short circuit, if you disconnect it, the mac should turn on. Sticky/malfunctioning trackpad can be caused by faulty battery. If some of the keys were working, remove everything to see the bottom of the keyboard and backlight, because likely liquid damaged. Also try to disconnect everything from the logic board, except the fan and the DC board and see if it starts automatically or not. If not, definitely logic board issue (and most likely liquid damage, if the keyboard and trackpad has the signs on them.)
From the symbols, most probably the system files are corrupted. If possible, boot from an external operating system(if that works, that means the OS on the internal drive-or the drive itself is definitely faulty) and backup your data. If the disk utility says "D.U. can't repair the disk", doesn't always mean the drive is faulty. Try to install fresh OS on your internal drive and see if it works.
Battery/charging flex/logic board are the possible faulty parts. If the screen is faulty and you connect it to a mac, iTunes should start. If it doesn't happen, then one or more of the internal parts are faulty.
From the Apple Support site: Try putting your device in recovery mode this way: Plug the device into the computer and hold down both the sleep/wake and home button together until the iTunes logo appears on the phone. Sometimes when your device is in a reboot loop this is the best way to put it into recovery mode. Normal Recovery Mode Steps: 1: Disconnect all cables from your device. 2: Hold down the Sleep/Wake button, then "slide to power off" to turn off your device. 2(alt): If the device is unresponsive you may need to power down the device by holding both the Sleep/Wake and Home button together and then release them immediately when the screen goes black. 3: Ensure that the device is fully powered down 4: Press and hold the Home button and plug the device into your computer. If your device doesn't turn on automatically, turn it on. Don't release the Home button. 5: Continue holding the Home button until you see the Connect to iTunes screen. 6: If iTunes doesn't open automatically, open it. iTunes will...
Hi. No, it is not possible to power on without battery. If you can, take it to a repair shop give them to test, and if it works, buy a battery. Or just simply buy a used, but working one, if the phone won't turn on, then the logic board is faulty as well.
It won't. But make sure you remove the cable's broken part from the logic board connector to prevent any damage to the LB in the future as well as the other part of the ribbon cable must not touch the logic board. And adjust the KB backlight to zero when OS X loaded.
Did you order(get) the right screen? There are 2 different screens for alu Unibody Macbooks. The thing is, Apple changed the screen connector position on the logic board as well as the pin layout in the connector. Also, the display cable has a different shape. If you connect the different generation screen to the logic board, it will burn the backlight fuse.