phone won't boot (red LED) - Xperia Z Q&A, Help & Troubleshooting

help! I recently have unlocked my phones bootloader... after that it still was working fine and then I flashed customized 5.1.1 and it went dead! the phone wont turn on anymore! no vibration, only the red LED is blinking when I press power (very often it blinks for only three times)
cant boot into fastboot or flashmode
when charging it only the led is constantly red and doesnt change, the screen stays black. hard reset didn't work, removing the battery didn't work

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How to Fix Blinking RED LED

To be honest with you there is no immediate fix for this it takes up to a week to fix and this method may not work. I fixed my phone twice now doing this and it's been a life saver. It's for peope in a boot loop that does not cease and will not let you enter fastboot or flashmode.
REQUIREMENTS:
*You will need this SEUS
*Drivers for your phone ( use flashtool and go to where the folder is where you installed it and look for 'drivers' and open and install your respective driver software for your device)
*PC Companion (optional)
*USB Cable
*Windows
*Your Device
All download links can be found in the Downloads Section below.
The Instructions;
1. First of all if you are in a boot loop try to hold the power and volume up button until one vibration is felt.
-If you are still in a boot loop (sony logo repeating) try holding it until 3 vibrations are felt
2. Now if this doesn't work then you need to let the phone boot loop until it goes blank and it can no longer continue to boot. Once this happens if you see 2 red LED blinks or 3 RED LED blinks put your phone on charge via mains.
- Make sure that the phone has a SIM card inserted or the phone will not charge after 15 minutes. Then go back to it when you see a green LED or after 1 hour and try to enter flashmode (green LED)
3. Using SEUS (recommended) select your device and install a new fresh firmware and there you'll have your device running.
Downloads:
SEUS :http://www.sonymobile.com/gb/tools/update-service/
PC Companion :http://www.sonymobile.com/gb/tools/pc-companion/
Flashtool :http://forum.xda-developers.com/showthread.php?t=920746
NOTE: I do not own any of the software above and is provided by all respective owners. Thanks to all of the creators this is possible.
What went wrong when the phone develops the blinking red led plaque?
Hi.....I've had a similar problem with my Sony Xperia LT30.....3 days ago it froze and shut off by itself. I've tried many,many things to fix the problem but would never turn on,only the red light. Also the same happened when plugged into the computer would only stay red. Tried putting it into flash mode but it would never last long enough to flash the entire stock ROM with Flash Tool. So I took my phone apart and disconnected the battery for about 10 minutes. Put it back on the charger for 12 hours and got Flash Tool ready to flash the entire Rom this time hopefully. Did not have much hope,considering the countless attempts before with no success. But this time it flashed right away by holding down the volume down button and flashed the entire Rom. This is where I'm stuck now....I know I need to hold the power button down while the green lights on to get it out of Flash mode to charge properly, but when I put the phone on my wall charger I get no light for a few seconds than a solid red light than about 5 minutes later the green light comes on,than repeats the process. So I tried holding down the power button when the green light comes on ,but after a few seconds I lose the green light. it just goes blank than about a minute later the red light comes back on? Is it I just need to leave the phone on the charger for another 12 hours or so to recharge the battery,knowing it takes a long time to charge the battery in this state. Thank You for any help anyone can provide.

Xperia Z won't boot red led

Hi! I have a Xperia Z on the rom by Rajeev and Hodor kernel with Drm keys mod, unlocked bootloader c6603. I had my phone with 1% batery, i arrive home and the phone was turned off, i holded the power button and red led blinks(this is normal when you have your phone fully discharged) i plugged into my computer fot 5 minutes nothing happened only red led stayed on. I unplug the phone the red led still there, after 5 minutes red led dissapeared. i plugged into the charger and noting happend only red led, i unplugged it and red led is still on. What can i do? adb fastboot not working and volume up +power the same. What is the problem, i'm a little bit scared. Sorry for my english. Thanks.
115dan said:
Hi! I have a Xperia Z on the rom by Rajeev and Hodor kernel with Drm keys mod, unlocked bootloader c6603. I had my phone with 1% batery, i arrive home and the phone was turned off, i holded the power button and red led blinks(this is normal when you have your phone fully discharged) i plugged into my computer fot 5 minutes nothing happened only red led stayed on. I unplug the phone the red led still there, after 5 minutes red led dissapeared. i plugged into the charger and noting happend only red led, i unplugged it and red led is still on. What can i do? adb fastboot not working and volume up +power the same. What is the problem, i'm a little bit scared. Sorry for my english. Thanks.
Click to expand...
Click to collapse
Did you left your phone whilst reinstalling any ROM or flashing anything?
I can suspect that you;ve bricked your device.
You can try to stick POWER BUTTON + VOL. rocker and leave it for entire night. I have read that some had fixed this issue by the way which I'm writing now, but I'm not sure if it will work to you.
You can even leave your phone connected to charger for some while.
If it will not work either - I have seen some where in this forum thread in which were specified how to unbrick XZ with disassemblying it
LaurynasVP said:
Did you left your phone whilst reinstalling any ROM or flashing anything?
I can suspect that you;ve bricked your device.
You can try to stick POWER BUTTON + VOL. rocker and leave it for entire night. I have read that some had fixed this issue by the way which I'm writing now, but I'm not sure if it will work to you.
You can even leave your phone connected to charger for some while.
If it will not work either - I have seen some where in this forum thread in which were specified how to unbrick XZ with disassemblying it
Click to expand...
Click to collapse
I managed to get it running now wi fi mobile data doesn't work, and power button works to lock the screen but doesn't work to wake. I'm flashing .292 via flashtool, i hope all my problems will be solved. Before they worked very well.

[Q] Xperia Red Light

My phone discharged and turned off. After i put i to charger it light up RED Light and thats all, now i disconected it from charger but it is stuck on red light all the time. No reaction for the power button, vol up + power. It is just stuck on red light. Can i do anything ? Any one have mabe this issue ? Phone was on Stock Android Lollipop, only Rooted. No recovery , no unlocked BL.
zanakorus33 said:
My phone discharged and turned off. After i put i to charger it light up RED Light and thats all, now i disconected it from charger but it is stuck on red light all the time. No reaction for the power button, vol up + power. It is just stuck on red light. Can i do anything ? Any one have mabe this issue ? Phone was on Stock Android Lollipop, only Rooted. No recovery , no unlocked BL.
Click to expand...
Click to collapse
Have you tried to keep it plugged in for a few hours?
Yes i tryed for about 4h. Im trying to get it working all day. After i put it on Charger it light red led and stuck on it for about 1h even if i unplug the phone.
[edit]
Now it strated to blink 3 times red light when i try to run it on. After put it on charger it get stuck on red light.

HTC M7 cannot turned on after RUU flashed

I have an htc m7_ul with s-off. I tried updating to lolipop using PN07IMG_M7_UL_L50_SENSE60_MR_HTC_Europe_7.19.401.51_Radio_4T.35.3218.16_10.33Q.1718.01L_release_458803_unsigned.zip which failed in some parts of the flashing process and put my phone into RUU only mode.
After that I managed to flash M7_UL_JB_50_HTC_Europe_1.20.401.1_Radio_4A.13.3227.06_10.27.1127.01_release_308001_signed_2_4 which completed SUCCESSFULL without any errors. The phone rebooted and hopefully Htc quietly briliant logo appear and everything seems fine. Unfortunately this wasn't the case, the phone stuck in there. I try pushing several buttons power, power + vol up or power + vol down for several minutes but nothing. The phone was stucked on quietly brilliant logo. I waited until the battery fully drained and charge it for a while, I tried to start the phone again the phone couldn't boot up the only reaction it has is the capacitive buttons blinking whatever combinations of power buttons and volume buttons I used. The phone is not recognized in pc at all its like is completely dead (it is not even being detected in device manager) . Is there something I can to? I really tryed everything and search in forums for hours for an answer without any luck.
Update:
I am not sure if the phone is being charge since when I connect it to wall charger there is no red led light. Something I didn't mentioned is that before updating to lolipop I was on stock kitkat without root just unlocked bootloader and S-OFF using rumrunner. Any help will be appreciated !!
Update 2:
I left the phone alone and fully discharged, now when I put it on charger the red led blinks (turning on/off). I read that this led must stay solid red in order to get some charge. Its has been more than 5 hours and the red led didnt become solid red. I tried everything the forum solutions advice but without any luck.
Update 3:
I disconnected the phone from charger and weirdly the red led blinks (turning on/off) continues even is not connected to charger? Can anyone help me its urgent

indicator led light keep flashing green light but phone won't boot up

Hi Guy
My note 5 won't boot up with the indicate led keep flahsing green light.
hope someone could help or write down what you suppose happen to the phone ,thanks you guy so much.
I was charging my phone with wireless charger last night then go to bed ,this morning when I took my phone off the wireless charger noted that the phone won't boot up anymore with flahsing the green light ,
What I try:
1,try all the physical botton(like power ,power + Volume up ,power + volume down, power +volume up+volume down+home ) press and hold for awhile but not thing happen., still keep flashing the green light and black screen without boot up
2. try to plug the phone to the charge and computer ,also not thing happen ,still keep flashing the green light and black screen without boot up

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