Xperia U-not turning on, red LED stay 1 second only
I am currently trying to repair my friend's ST25i Xperia U, he encountered random crash and the phone won't turn on. I have tried to charge the phone but no reaction from the phone itself. if I pressed the lock button it only turn on the red LED for a second and nothing happens. I think I am having a problem with the kernel that it won't let the battery charged.
I am familiar with flash tool, when I tried to flash the device will not get into either fast boot or flash mode. IF i connect the phone to PC via USB(holding down up/down for either fastboot or flashmode), it only turn the red LED for a second.
anyone can help? I am currently trying to only charge the battery via universal battery charger, hoping that it is charged and can enter fast boot or flash mode so i can flash the device.
my friend said that it was running android 2.3.6, having a problem and sent to repair center upgraded into 2.3.7, then this random crash happened. I want to flash it to ICS by the way. I had the stock rom ready to flash.
Is there any flashing method that does not require a battery?
sorry for the long post, I hope you guys can help me with flashing