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Replaced screen, not booting

Hey guys,
just replaced my screen by myself and it isn't working. It boots and the screen lights up for a few seconds but thats it. So it seems like I ****ed up somewhere. :/
Now I've got some questions for you guys.
1. What could cause this error? Since it's already not working I don't mind taking it apart some more and trying to fix it.
2. Do you think if I send it to the support from OnePlus they will take a look at it?
3. The whole reason I did this was to get my data back. Is there any way to access the data on the phone without the touchscreen? I encrypted it using CynogenMod. USB-Debugging is enabled.
Thank you so much guys, I'd really appreciate some help. This **** is really tearing me down since it was a lot of work.

I did this on my own phone but Idk about OPO. If you use the power+voldown method to boot into recovery (yes ik nothing on screen) then connect a usb and see what happens
If you power it on, wait 5 mins then call it and if the phone rings you should be able to rule out the display and speakers and storage, obvs if the display is still not on at this point it is probably the display.
you can also adb from recovery and or fastboot so you should be able to see it in there if it is still working (make sure you change the phone for a decent amount of hours before you do any of these) If the display is dead its likely its been on for the last day and dead

Sorry for the late answer, really appreciate your help!
So if I connect the phone to the PC (tried it in recovery and in normal mode) windows detects the phone under "Devices" but sadly if I type in "adb devices" in cmd it doesn't detect the device.
But still, windows is detecting the phone so it seems to still function. I booted into recovery and I could use the touscreen and the lower buttons. I couldn't see anything but it was vibrating whenever I was using the touscreen. So it seems like only the display part is broken.
Can't call the phone since it's fully encrypted so I need to type in a password before booting anything (recovery, normal mode, ...)
I'll try to contact the vendor of the display and see what he has to say.
If anyone got any more tips I'd appreciate them. I'm a pretty big noob so I even appreciate "common sense" tips.

I know this may be a "common sense" thing to say, but double check your connections. Sometimes the connectors aren't made properly and a pin could be covered so you can try connecting and disconnecting several times to see if it clears up.
Since the touch screen was registering and vibrating, then it could be the backlight that's broken. Try holding a flashlight at an angle and see if you can make out anything on screen. If it's the backlight, then you can probably back up your data in case your phone does end up breaking.

reconnected everything multiple times and also tried the flashlight trick. sadly with both no luck
but something good:
adb recognizes my phone in "recovery"
bad news: no commands work, most likely because the phone is encrypted. if I enter a command nothing happens, it looks like its loading forever.
any ideas?

Hey!
I also had the same problem after I replaced OPO's screen about one year ago. The replacement screen was from ebay.
I could see the Cyanogen logo but after a few seconds the screen became black. Booting into recovery mode worked well.
On the video also ROM boots well but the screen stays black.
https://www.youtube.com/watch?v=VcWDCJIkPKQ
Eventually, the screen was defective and I returned it and bought new one.

LG G Flex 2 stuck in Fastboot mode

I was copying a movie onto my H950 when it started to take a long time. I was in a rush so I canceled the file transfer and waited for the computer to finish prompting me about the cancellation. I then unplugged the phone from my computer and noticed that the charging light was still on. I then noticed the phone wouldn't wake up when I pressed the power button. I held the power button and the volume down button to do a hard reset but after the LG start up screen all I got were some random numbers in brackets and "Fastboot mode started" in small text at the upper left hand corner of the screen. The numbers tend to change from time to time.
I have done multiple resets, let the battery die all of the way, recharged all of the way, factory data reset and nothing has changed a thing. When I boot it into download mode it sits there for a minute and by the time the computer sees that it has been plugged in the phone goes back to the black screen with the "Fastboot mode started" text. The computer also only recognizes it as Android Bootloader Interface in the device manager.
It is recognized by the "fastboot devices" command but thats about all I have been able to get out of it. It wouldn't accept flashing a new system image on it either. Please tell me there is still hope. I cant wrap my head around how something so normal could have caused this to happen. It has been rooted for around 6 months and I haven't done anything to the phone sense. I cant even remember what version I was running. I would greatly appreciate any help or advice.

somehow corrupted the laf partition maybe !!
try :
1. fastboot continue
2. fastboot reboot
if it does not work contact LG

i have the same problem with the same variant . tried everything but the kitchen sink .
took it to LG Romania but because its an US device they could not help .

Tesco Hudl 2 boot

Hi all. I've been given a Tesco hudl 2 that has turned into a paper weight and basically tesco have washed their hands from it.
It has a common error 'No boot device. Hit ok' - but there is no response from screen or power/volume buttons to enter 'ok'
I plugged in a usb keyboard via OTG adapter and pressed enter which takes it to Boot Manager - with sub menu - Boot Options Menu
but there are no options to select and pressing enter just flashes the screen.
I have tried the factory hard reset option and doesnt work. Just turns on and turns off.
There is no charge light when plugged in, but does turn on to, again 'No boot device. Hit ok'
There is no adb access
I absolutely hate wasting tech and like to use them for other uses. Anything that can be done here?
Is the motherboard blitzed someway.
Anyway to flash a rom via SDcard or force some sort of bootloader access or recovery?
Can the rom be flashed with hardware directly on the chip (tho I don't have the equipment, just a query).
Its suppose to be a good enough IPS display with 1,920×1,200.
Ok now for the out of box ridiculous thinking. Can the mainboard be replaced with another brand of tablet with perhaps better specs.
Can these LCD panels interface with other systems at all, to perhaps a laptop via some sort of display board for a possible car project?
A lot of questions, but hope someone can shed some light. I love finding things out and fixing things, if possible.
Thanks

bump

I have replaced a dead hudl2 charging port and battery all i am getting is a faint green light but not always. however still not booting any ideas please

Korean V500N screen won't turn on

It is the second time this happened. Last time it fixed itself after half an hour.
The screen is always pitch black and the device stays warm.
Most of the time it is boot looping with a black screen, the 5G led on the back keeps blinking in different colours. When connected to a PC, in Device Manager I can see two "LG-V500N", then it disappears after a minute, and comes back, repeat.
Sometimes the device boots and stay booted with a black screen, I can tell the device is on because it is listed in "adb devices". Unfortunately I don't have any authorized device to connect to it via adb.
I am not sure what I can try, I have pressed and hold power + vol down many times but the screen remains black.
I also have trouble switching off the device, it seems to either stay on or boot loop.

After letting it rest for a few hours, switching it on shows this screen, with a white/gray line at the top of the screen, and after 5 seconds it switches itself off again.

k3vink3vin said:
After letting it rest for a few hours, switching it on shows this screen, with a white/gray line at the top of the screen, and after 5 seconds it switches itself off again.
Click to expand...
Click to collapse
Get into download mode by powering off the phone and pressing volume up while having it plugged into a PC. Then find a guide to flash a kdz lgup. You will probably lose data or have already lost it

antintin said:
Get into download mode by powering off the phone and pressing volume up while having it plugged into a PC. Then find a guide to flash a kdz lgup. You will probably lose data or have already lost it
Click to expand...
Click to collapse
It seems the phone will not stay in download mode for more than 5 seconds, it powers off after showing the big download mode screen for 5 seconds.
I will try to leave my phone on the charger for some time and then try again.

antintin said:
Get into download mode by powering off the phone and pressing volume up while having it plugged into a PC. Then find a guide to flash a kdz lgup. You will probably lose data or have already lost it
Click to expand...
Click to collapse
I managed to get the device to enter and stay in download mode, however the screen stays pitch black and I am not sure if I should continue flashing.
Would you go ahead and flash it if you were me?
The device is currently on Pie, I will probably try flashing a Pie KDZ first, before an Android 10 KDZ.

Sometimes there is a brief moment where the screen comes on, that's when the LG V50 logo shows before entering download mode.
Did an UPGRADE with V500N11r_00_KT_KR_OP_1017.kdz, which should be the same firmware that the device is already on, it flashed successfully, didn't seem to help, screen remains pitch black.
Did a REFURBISH with the same kdz, didn't seem to help either.
The phone seems to continue to boot loop after the REFURBISH flash. When connected to PC, LG-V500N shows up and then disappears repeatedly. Sometimes I can hear a sound effect being played from the phone, sounds like it has booted and the sound probably came from the initial setup screen.

Seems the phone has stopped boot looping, it is on the initial setup screen. The screen remains pitch black but it responds to touch.
Not sure where I can go from here.
Edited:
The screen has come on briefly once for a few seconds, it is on the initial setup screen. I only had time to switch the language to English, then the screen went black and the device seem to have crashed (no longer makes sound or vibrate as I randomly tap on the screen)

k3vink3vin said:
Seems the phone has stopped boot looping, it is on the initial setup screen. The screen remains pitch black but it responds to touch.
Not sure where I can go from here.
Edited:
The screen has come on briefly once for a few seconds, it is on the initial setup screen. I only had time to switch the language to English, then the screen went black and the device seem to have crashed (no longer makes sound or vibrate as I randomly tap on the screen)
Click to expand...
Click to collapse
I think it's some faulty hardware at this point. You've tried everything possible as of now.

k3vink3vin said:
Seems the phone has stopped boot looping, it is on the initial setup screen. The screen remains pitch black but it responds to touch.
Not sure where I can go from here.
Edited:
The screen has come on briefly once for a few seconds, it is on the initial setup screen. I only had time to switch the language to English, then the screen went black and the device seem to have crashed (no longer makes sound or vibrate as I randomly tap on the screen)
Click to expand...
Click to collapse
Hi! I bought an LG V50 and exactly the same things you described happens to me, the screen starts, it shows the logo, but then it goes completely black, but phone starts, sounds are heard and the touch screen work. But not image, screen is black. Could you find out what hardware defect it is? It's the display module, or will it be the motherboard? Thanks

Nope, I have sold the phone as parts.

H
k3vink3vin said:
I managed to get the device to enter and stay in download mode, however the screen stays pitch black and I am not sure if I should continue flashing.
Would you go ahead and flash it if you were me?
The device is currently on Pie, I will probably try flashing a Pie KDZ first, before an Android 10 KDZ.
Click to expand...
Click to collapse
OW CAN YOU MANAGED TO SATY IN DOWNLOAD MINE ALSO HAVE SAME ISSUE DOWNLOAD MODE GONE AFTER 2 TO 3 SECONDS....PLEASE TELL ME HOW TO STAY...
AND YOUR PROBLEM SOLVED OR STILL

Dntx27 said:
Hi! I bought an LG V50 and exactly the same things you described happens to me, the screen starts, it shows the logo, but then it goes completely black, but phone starts, sounds are heard and the touch screen work. But not image, screen is black. Could you find out what hardware defect it is? It's the display module, or will it be the motherboard? Thanks
Click to expand...
Click to collapse
I got a samsung Note 10 doing this! Took it to local shop! he sprayed some liquid near the proximity sensor area and I saw my phones screen came back to life ;while hiding it he was Telling me if he can repair the screen without changing it he"ll need 20$.. I laughed and told him not interested to repair....

Motorola XT1542 Weird brick, (Please help)

Due to some finantial plot twists in my life I've been forced to dust out my old Motorola G 3rd gen and use it as my main phone. A couple of days ago I followed a guide in how to unlock the bootloader and installed Lineage OS, everything was decently smooth, except by the fact that it didn't recognize my SIM card.
So as a troubleshooting step (And since I still didn't had anything important on my phone) I decided to reload a recovery image I had made with the original ROM.
And here is where the troube started. TWRP finished the restoration of the image and I told it to reboot the phone, now it has been stuck on the "Warning Bootloader Unlocked" Warning screen for the past hour or two. When I try to turn it off I hold the power button and 10 second later the screen goes off, but a few seconds later it turns back on and goes back into the warning screen.
When I plug it into my computer it isn't recognized and for some reason it doesn't allow me to enter the Bootloader (It might be worth noting that the volume down button hasn't worked very well for some years.)
So, it's not completely unresponsive, I have a screen and it recognizes button presses to some extent, but I can't do anything with it...
Is there any way I could fix it? I'll appreciate any help. (I don't care if I have to format the phone, I just need to fix it)

martiagosantinez said:
Due to some finantial plot twists in my life I've been forced to dust out my old Motorola G 3rd gen and use it as my main phone. A couple of days ago I followed a guide in how to unlock the bootloader and installed Lineage OS, everything was decently smooth, except by the fact that it didn't recognize my SIM card.
So as a troubleshooting step (And since I still didn't had anything important on my phone) I decided to reload a recovery image I had made with the original ROM.
And here is where the troube started. TWRP finished the restoration of the image and I told it to reboot the phone, now it has been stuck on the "Warning Bootloader Unlocked" Warning screen for the past hour or two. When I try to turn it off I hold the power button and 10 second later the screen goes off, but a few seconds later it turns back on and goes back into the warning screen.
When I plug it into my computer it isn't recognized and for some reason it doesn't allow me to enter the Bootloader (It might be worth noting that the volume down button hasn't worked very well for some years.)
So, it's not completely unresponsive, I have a screen and it recognizes button presses to some extent, but I can't do anything with it...
Is there any way I could fix it? I'll appreciate any help. (I don't care if I have to format the phone, I just need to fix it)
Click to expand...
Click to collapse
So I don't know if this is helpful in anyway, but I'll wait for it to run out of battery and then I'll try to plug it into the computer again, maybe that helps in any way?

I found this reddit thread
https://www.reddit.com/r/MotoG/comments/5iz8fz
Someone had the same issue (Or a very similar one) I had, but I don't know if OP figured out a way to fix it, or if he was able to get into the bootloader.

Update, the phone ran out of battery and it's shows the low battery screen when I try to turn it on, or when I try to enter Bootloader, it's still not recognized by my PC