Xperia V stuck on fastboot - Sony Xperia T, TL, TX, V

Hello,
Recently my phone dropped and half of my touch screen stopped working. I have disassembled my phone just to try if the old lcd will work when I plug the connector out and in again. I discovered that no so I have ordered the new LCD. During the reparation I accidentally broke coaxial cable between the antenna and motherboard so I ordered the new one. Now phone worked, but there was no phone signal but display and everything else worked just fine. I have disassembled the phone again when the new coaxial cable arrived but I have discovered, that I have bought bad one because it did not work. So I left the phone disassembled and wait for another one.
After I assembled the phone with the second coaxial cable my phone does not show nothing on the screen, even on the old LCD. When I connect phone to the pc I got instantly to the fastboot and I can get out of it. After fastboot reboot I get again to the fastboot.
Sometimes the LCD powers up but does not show nothing, and when the phone is in the charger the diode is red.
Does anybody have any idea how can I fix this problem?
I have tried to boot the phone without camera, speaker, antena, but nothing worked.

Anyone?

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The situation- Friend gave me his htc g1 which had a cracked lcd but was in full working order, got it repaired from a shop. Couple of weeks later whilst attempting to root the phone the screen died, opened it up and the flex cable was broken. Repaired it myself this time and once I did the backlight now worked but there was no picture. It plugs into the computer fine,I think I've factory reset it(it vibrated a second time after i held the keys). Any ideas on how I can fix the problem or what could be the problem? I have tried to unroot with a blank screen as well and so I have no idea what the status of the phone software wise is...Although I can hear sounds occasionally when I press the camera button or the volume buttons when the phone is on- It vibrates when it is turned on.
Kind regards, Nabeel
Is it bricked? IS there anythign I can try? Any help would be appreciated...
Bump =(...I am currently trying to drain the battery and then charging it overnight....This may take a while....
Battery was drained,charged it up using my computer and a min-usb cable, still nothing...Is it bricked...Any help would be nice...

Someone willing to test this quickly, please.

Alright, well my captivate has been broken for probably a month and a half now. My earpiece flex cable is broken, and I want to confirm that this is the reason that my phone won't work. Would anyone be able to check to see what happens when they turn their phone on with the earpiece/light sensor cable is unplugged from the motherboard? My phone goes only to the download mode screen, and it isn't recognized by a computer, and I need to figure out if it's the earpiece cable causing the problem or if there is also a problem in the loudspeaker cable.

[Q] Xperia Z Wont turn un unless usb connected

Hello
Recently i've bought an broken screen Xperia Z, for repair it (i got it like $300 bucks cheaper) and i was ready to buy the screen, but i battery was drained and i could not test it right, when i connected to the charger, it started red light, vibrate, then 3 continuous vibes, read on the internet, OK BATTERY DRAINED, i left it charge THE WHOLE NIGHT, and when i woke up in the morning it was orange (charging), later in the day it was green (charged) but when i disconnect it, it wont turn on anyways, when i connect it to a pc, it goes blue light (wich later i read it was fastboot mode). i read for making a repair with PCC, but it didnt fixed it, then i flashed it with Flashtool, with the latest software (wich had the Sudden death issue fixed) no luck. it wont boot. for it to boot, i have to connect it to PC and with fastboot run "fastboot continue", but most of the time, it reboots and goes redlight and vibrate 3 times then reboot, so i press the power button and it enters fastboot mode (if connected to PC) or loads charging if connected to wall charger, but it reboots again and goes to redlight vibrate reboot, sometimes it stay charging or in fastboot mode, but only "works" if connected in the USB.
when it stays in fastboot, i do "fastboot continue" and it loads the OS, and it works (well, the things i can do with a broken LCD/Touchscreen, i put my sim card and could call it, and it works, but i cant pick up the call). i can explore the phone memory etc. but if it reboots or if i disconnect the USB, it will almost always turn off. i havn't found a solution (or idea) of what can happen, i dont know if its normal since it has broken lcd/touchscreen or it definitely have a huge problem,
any ideas?
thanks in advance!
Maybe the battery is damaged, and the phone knows it and boots into some sort of safe mode to spare internal damage? When the is has booted you can take screenshots with adb if you have usb debugging enabled. Maybe try see if the os says the battery is damaged?
Sent from my HTC Sensation XE with Beats Audio Z715e using Tapatalk 2
heavy_metal_man said:
Maybe the battery is damaged, and the phone knows it and boots into some sort of safe mode to spare internal damage? When the is has booted you can take screenshots with adb if you have usb debugging enabled. Maybe try see if the os says the battery is damaged?
Click to expand...
Click to collapse
Well, actually it doesnt seem the battery is damaged, fisically looks ok and it holds charge, i cant debug because usb debugging comes off by default when flash stock software.
blackknigt said:
Well, actually it doesnt seem the battery is damaged, fisically looks ok and it holds charge, i cant debug because usb debugging comes off by default when flash stock software.
Click to expand...
Click to collapse
Correct me if i am wrong but does the xperia z not support usg-otg and mhl? You could rig the phone up to the tv with a mhl-hdmi cable and maybe use a usb mouse to select things, and enable usb debugging?
Sent from my Nexus 7 using Tapatalk 4
Nice idea, now i need to find who in this country (DR) have that adapter
i ordered the LCD screen assembly for repair it myself, but im still concerned about this, as i dont know if it will boot up anyways
my phone right now isnt booting. but as i cant see images i dont know what is it showing.
i noticed the touch screen is working indeed. (when booted, it plays sounds when tapping)
i will wait till the lcd assembly arrives. any ways, any other ideas on what may happen?
the ex-owner of the phone said it started like that when it fell and broke the lcd.
OK now, i've installed the LCD, the phone works, its ON, BUT the Volume Up button and the Power Button does not work when the phone is ON,
the Vol UP button seems always be pressed cause when i press the power button for some seconds, the Phone restarts and not power off or lock/unlock
Service tests: None of these buttons where recognized.
any ideas on any hardware fixes i could try?
I FIXED IT!!
dissasembled the phone, took out the side button flex cable and the volume up button on the flex was dirty, so it was having a false contact. (wich made the button always be pressed)
I took out the yellow tape and cleaned with alcohol and a needle (its so freakin small) and put the tape again and assembled the phone and voila! IT WORKS OK!!
Yes the vol up button pressed means u get fastboot. Now that you fixed the problem and repaired the phone enjoy. Btw nice job getting it up and running.
[email protected] Z

Redmi 4x mainboard problem

Hi, after replacing the lcd (with frame) to the phone, it doesn't started at all (no vibration, nothing) I tried combination of buttons (recovery, bootloader) nothing, dead. Then i put it on the computer (via usb), noting, on a charger no vibration, nothing. Luckily a had a same phone available and searching the problem i change the mainboard and the phone booted! Is there any idea of what happened?Will i need a new mainboard? Or is there any other solution?
talk to a xiaomi service center
It may be a loose connection between the connectors and the main board..

Screen is dead after disconnecting/reconnecting battery.

My phone went to an endless bootloop after a botched attempt to install TWRP. I tried hard pressing the power button to no avail, and I can't access fastboot either. That's why I removed the back cover and disconnected the flex cable from the battery on the phone's motherboard.
Later on, I reconnected my phone's battery after my shift ended, then I tried to flash my stock rom through SP Flash Tool + bypass tool python script and it went through with a success. However, this time, my screen seems to be completely dead but my phone is still showing some signs of life (short vibration when pressing the power button, but since then it seems that it takes a few seconds more from pressing the power button to turn it on. ) I reconnected and disconnected everything to see whether or not I missed out something but the issue still persists.
The computer reads the device as "Android ADB interface" and the adb console reads it as *device id* unauthorized when I ran adb devices command. There's no notification light whenever I plug it into the charger.
Is my screen dead, or is my motherboard toast? I need to know as I don't want to spend money to buy a replacement LCD only to know that the motherboard's dead. I don't really care about the IMEI as I'm just going to use it as an authorization device for work. I can just always connect to Wi-Fi. Please advise.
One problem after another, so it seems.
Turns out I already unbricked the phone, but the thing is that my display's backlight got busted for some reason. Unless I shine a flashlight through it, I won't know what's in the screen. I'm currently on the way to get a replacement screen, and a new battery cover.
I guess this will be the last Xiaomi device that I'll ever get. This is the only time that I experienced such flimsy build quality since the LG G4.
Maybe you have destroyed a lil cable or something.

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