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Hi guys,
I did something very stupid and it seems I've bricked my arc for good
My Arc had unlocked bootloader and was on rooted 2.3.2. When the phone found firmware OTA update, I chose to download it, then the phone rebooted and started installing new firmware. After a minute or so, it turned off and that was the end, it's not possible to turn it on any more. The led won't even lit up. Is there anything I can do to revive it ?
Arrrgh, this exact same thing happened to me, I woke up and it said there was software update available (I have unlocked bootloader and rooted 2.3.2)
I blame still being mostly asleep on hitting ok. Now I have a brick!
Some more info.
I've tried pulling the battery and putting it back in, It still won't power on.
I've tried holding down menu and plugging it into USB to reflash it and the blue light doesn't come on.
Sorry to hear that, and many people have this problem: http://forum.xda-developers.com/showthread.php?t=1106250
Can't update firmaware through OTA after unlocking bootloader
Sorry to hear about your phone
I always turn of the "auto check for updates" thingy on android. Learned the hard way on my Desire when it got updated to Froyo over OTA and had to wait a while for root lol.
Anyway,SE provided the info to unlock the bootloader and that an OTA coming from them bricks the phone is kinda silly. Far as i know u can't update through SEUS (might be wrong) when it's unlocked and it would be a nice idea maybe to not be able to install the OTA update either.
Mano1982 said:
Sorry to hear that, and many people have this problem: http://forum.xda-developers.com/showthread.php?t=1106250
Can't update firmaware through OTA after unlocking bootloader
Click to expand...
Click to collapse
Jerpelea has posted an unbrick (softbrick) package, can anyone test if this can unbrick the device?
http://forum.xda-developers.com/showthread.php?t=1116970
magnumhex said:
Jerpelea has posted an unbrick (softbrick) package, can anyone test if this can unbrick the device?
http://forum.xda-developers.com/showthread.php?t=1116970
Click to expand...
Click to collapse
won't work if you can't get it into flash mode.
Can't you get it into Fastboot mode (give it a few hours charge..) then pull the battery for 30 seconds...
then hold the menu button while plugging the usb cable in... should (in theory) go into fastboot mode - then you can fastboot flash a fresh system.img
im_iceman said:
Can't you get it into Fastboot mode (give it a few hours charge..) then pull the battery for 30 seconds...
then hold the menu button while plugging the usb cable in... should (in theory) go into fastboot mode - then you can fastboot flash a fresh system.img
Click to expand...
Click to collapse
Tried - no help though. Any other ideas? Or just to go and buy a new one?
By the way, did the same thing: my Arc LT15i has/had unlocked bootloader, rooted 2.3.2 (first firmware) and is/was 3.0.A.2.181. While preparing to try to lock bootloader in order to use SEUS and upgrade firmware, I've connected the phone which asked me to check for the updates and found T-mobile update (approx. 40Mb). Asked to dowloand and an idiot pressed "OK". And now, everything is black - just as the mask of the phone is.
The green light just blinks when the "power on" button is pressed, or charger is plugged in.
Can't it be unbricked with flashtool?
Sent from my LT15i using Tapatalk
[UPDATE] to my previous post:
Steps I have done:
1. Charged the battery for 4-5 hours
2. Flashed my Arc using the manual for flashing by @Step666
3. The progress went well and at the end there was a message:
"INFO - Now unplug the device and power it on
INFO - Then go to application settings
INFO - turn on Unknown Sources and Debugging"
I have tried to turn on the phone. There was a small vibration as when you're turning on the phone (note: before flashing there was not even this vibration when pressing power on button), but the screen remains black.
Any ideas for next step(s)? Thanks for trying to help!
spngbby said:
[UPDATE] to my previous post:
Steps I have done:
1. Charged the battery for 4-5 hours
2. Flashed my Arc using the manual for flashing by @Step666
3. The progress went well and at the end there was a message:
"INFO - Now unplug the device and power it on
INFO - Then go to application settings
INFO - turn on Unknown Sources and Debugging"
I have tried to turn on the phone. There was a small vibration as when you're turning on the phone (note: before flashing there was not even this vibration when pressing power on button), but the screen remains black.
Any ideas for next step(s)? Thanks for trying to help!
Click to expand...
Click to collapse
Anyone found any solution??
Thanks
Try to repair it with pc companion. I had the same pb and this manip fix it.
Solved
lenathou972 said:
Try to repair it with pc companion. I had the same pb and this manip fix it.
Click to expand...
Click to collapse
This solved my bricked arc
sorry for spaces b/w link
talk. sonyericsson .com /thread/ 24813
How can you repair a bricked phone with pc companion? Dont u need the phone to be booted and running?
No, but it will need flash mode. Hold back button while plugging in usb to pc. If not recognized, use Wotan server.
Sent from my LT15a using xda premium
tenca1 said:
Anyone found any solution??
Thanks
Click to expand...
Click to collapse
Did you find a solution to this i got the exact same thing
djc
djc151084 said:
Did you find a solution to this i got the exact same thing
djc
Click to expand...
Click to collapse
Found the problem myself, after sliding up the little black test point cover, it interfered with the screen, so holding the top left corner tight enabled the screen, so shook the phone a bit and it's fine now, must have been wedged somewhere it shouldn't have been.
Djc
Sent from my CM9 ICS MB525
Hello guys, i have a problem with my sgs .. after downgrade from jv9 to froyo i've got my sgs bricked.. cannot enter do download mode by 3 button combo and by usb jiig is well ( jig is working, checked on sgs2) only thing happening is when i connect it by usb cable to my laptop i getting info the windows cannot find the driver for it and after few seconds is disconnecting.
Any ideas how to get it back to life ?
Thanx.
ps. sorry for my english. Cherrs
What happens when you turn it on normally?
At what screen does it stop?
Can you enter recovery mode?
its totally dead.
Remove the battery, wait a few minutes ( In fact, 30 sec should be alright ) the put it back. Press power button, if you see the phone -- triangle -- pc image, then just remove the battery again, put it back and plug your jig. If you see nothing i'm almost sure your screwed.
Steps:
First Remove your battery and wait 60 seconds
Then put the battery back in
There will be a small hole in the right side of the camera like a soft reset hole
take a paper clip
insert it in the hole and wait 25 seconds while pressing it in
then go into the download mode but the volume down +home button + power button
If the button method doesn't work try using the jig
Now it should work
yaro014 said:
Hello guys, i have a problem with my sgs .. after downgrade from jv9 to froyo i've got my sgs bricked.. cannot enter do download mode by 3 button combo and by usb jiig is well ( jig is working, checked on sgs2) only thing happening is when i connect it by usb cable to my laptop i getting info the windows cannot find the driver for it and after few seconds is disconnecting.
Click to expand...
Click to collapse
Can you try running USBDeview from http://www.nirsoft.net/utils/usb_devices_view.html . You should see all your existing devices like mouse, keyboard etc. Then plug the phone in, and if it shows up in USBDeview tell me what it says in these columns for the phone device:
VendorID, ProductID, USB Class, USB SubClass
You may need a couple of tries to get all the numbers if it's disconnecting after a few seconds.
I'm interested because it could be the type of brick we are trying to fix in this thread where the bootloaders have been corrupted and it is going into processor recovery mode. We don't have a fix for you but if I'm right it will confirm that you need to get the phone reflashed by Samsung. Ask them how they do it while you're there.
hmm i cannot see any hole on the right side of the camera.. there is only connector looks like gps antenna.
i tried on 3 different batteries and i tried to take battery out for few minutes and still not work..
hmm so what if there is that bootloader fault?
this is o2 brand phone so do you think guys can i just go to o2 and say that stops working after kies upgrade or some rubbish like that ? do you think that will work ?
yaro014 said:
hmm so what if there is that bootloader fault?
this is o2 brand phone so do you think guys can i just go to o2 and say that stops working after kies upgrade or some rubbish like that ? do you think that will work ?
Click to expand...
Click to collapse
Just say to them i was updating my phones software via kies and my pc crashed because of some other application so it got interrupted in the half way now i can boot into my phone.
do you think they will accept it ? i mean .. if they will fix it and say this is my fault then i'll need to pay for this fix ?
anyone guys has experience with it ? how long it takes ?
yaro014 said:
hmm so what if there is that bootloader fault?
this is o2 brand phone so do you think guys can i just go to o2 and say that stops working after kies upgrade or some rubbish like that ? do you think that will work ?
Click to expand...
Click to collapse
Yes, they won't be able to tell what caused it, though your custom firmware could all reappear if they only reflash the bootloaders. But at least your phone will be fixed.
hmm ok but if they will know i had custom firmware they will charge me for repair ?
how log it normally takes ?
actually i was flashing the branded o2 froyo firmware while it happens.. but i got info from odin unsuccessfully flashed...
//ps
Device recognized by windows :
SEC S5PC110 Test B/D
USB\VID_04E8&PID_1234&REV_0100
yaro014 said:
hmm ok but if they will know i had custom firmware they will charge me for repair ?
how log it normally takes ?
actually i was flashing the branded o2 froyo firmware while it happens.. but i got info from odin unsuccessfully flashed...
//ps
Device recognized by windows :
SEC S5PC110 Test B/D
USB\VID_04E8&PID_1234&REV_0100
Click to expand...
Click to collapse
Try reinstalling the USB drivers from my signature.
yaro014 said:
hmm ok but if they will know i had custom firmware they will charge me for repair ?
how log it normally takes ?
actually i was flashing the branded o2 froyo firmware while it happens.. but i got info from odin unsuccessfully flashed...
//ps
Device recognized by windows :
SEC S5PC110 Test B/D
USB\VID_04E8&PID_1234&REV_0100
Click to expand...
Click to collapse
The brand market can see if u rooted the phone,
But i i also got this kind of brick, when i instaled a 9000m modem to my int i9000,
what i did i heated the phone, this is not a joke, a heated the phone used adb to enter download mode and i flashed stock 2.2 from samfirmware.com
The phone newer worked well so my provider changed the phone and didn't saw that i root it.
try adb and heating than the 3button combo.
good luck
yaro014 said:
Device recognized by windows :
SEC S5PC110 Test B/D
USB\VID_04E8&PID_1234&REV_0100
Click to expand...
Click to collapse
Yep, that confirms that your initial bootloader is trashed and the CPU has gone into USB recovery mode because it couldn't load the bootloader. The only fix currently is to get Samsung to reflash it, or get someone with a Riffbox or other JTAG equipment to fix it. Heating the phone will not help you, neither will reinstalling Samsung phone USB drivers.
yaro014 said:
hmm i cannot see any hole on the right side of the camera.. there is only connector looks like gps antenna.
i tried on 3 different batteries and i tried to take battery out for few minutes and still not work..
Click to expand...
Click to collapse
Well mate; if we are talking about the usual samsung galaxy s , when we open the lid there definitely is that small gutter with a hole in it . That little diaphragm can be pressed by a blunt pin.
Your provider should fix the phone no problem.
Sent from i9000m on cm7, with xda premium.
Try JIG it help me.
At marktplaats ( EBAY??) you can buy an usb device to help you it works great.
Search te forum "Samsung i9000 galaxy S micro USB download mode Jig"
http://forum.xda-developers.com/showthread.php?t=819551
http://cell-phones.shop.ebay.com/Ce...SB+JIG&_catref=1&_fln=1&_trksid=p3286.c0.m282
Hi There all,
I bricked my device!
I installed multi window manager and ran the patch.
I should have not done this.
After one last message (something like copy binary from SD card) the device was dead.
Any help is highly appreciated
HANSB57 said:
Hi There all,
I bricked my device!
I installed multi window manager and ran the patch.
I should have not done this.
After one last message (something like copy binary from SD card) the device was dead.
Any help is highly appreciated
Click to expand...
Click to collapse
Can you access recovery or download mode?
sefrcoko said:
Can you access recovery or download mode?
Click to expand...
Click to collapse
No I cant.
All combinations (power, volume home etc.. failed)
Removed back cover, disconencted battery
No result.
How did you remove the back cover?
I've been able to get mine out of pickles not involving the /boot partition by holding down the volume down, home and power keys simultaneously. Shortly after the model 5110 message displays, I release power and am asked if I really want to put the device into update mode.
I use Odin to write in the firmware I downloaded from samfirmware a few weeks ago.
I needed to do this last night after trying to disable a few system apps. I'm not sure which, probably a thing called "bubble," but as soon as I had, the device froze. A reboot went all the way through but then locked up after my startups finished.
I also needed to do this after something much closer to a soft brick involving trying to use the Xposed framework to change lcd density.
I reflashed and was able to defrost and I was back in business.
roustabout said:
How did you remove the back cover?
I removed it by gently prying the white back cover of.
I would recommend agains it because its delicate.
But I think you would advice me agains bricking my device. :angel:
I cant get it in download mode.
It wont show the charging again when charging.
It seems dead
Anybody might have a clue??
Click to expand...
Click to collapse
something just occurred to me - you've pulled out your sdcard and set it aside? sometimes a bodgy sdcard can get in the way of boot up, though it seems unlikely here.
It doesn't seem that patching the framework, even if it keeps you from booting past the model # screen, should be able to keep the device from at least powering on.
If you connect it to your PC and try holding in power for ~30 seconds, does any USB device or android device activity occur at all, even if a device appears and disappears again?
I did find that I had a "konawifi" device attached to my PC and needed to update its driver to access the device in CWR mode.
roustabout said:
something just occurred to me - you've pulled out your sdcard and set it aside? sometimes a bodgy sdcard can get in the way of boot up, though it seems unlikely here.
It doesn't seem that patching the framework, even if it keeps you from booting past the model # screen, should be able to keep the device from at least powering on.
If you connect it to your PC and try holding in power for ~30 seconds, does any USB device or android device activity occur at all, even if a device appears and disappears again?
I did find that I had a "konawifi" device attached to my PC and needed to update its driver to access the device in CWR mode.
Click to expand...
Click to collapse
I pulled the SD card
This afternoon I will try your tip (connecting it to the PC)
I also will try a jig although I think this is useless
My last resort is back to Samsung. I have 2 choices, repair or make a frisbee out of it. I prefer the first option especially beacause I was rather pleased with the device
I tried making a jig when I bricked my Galaxy Media Player, and it did not work. Samsung repaired it, eventually.
roustabout said:
I tried making a jig when I bricked my Galaxy Media Player, and it did not work. Samsung repaired it, eventually.
Click to expand...
Click to collapse
Just brought it back to shop. Will sent it back to Samsung.
will take 3 weeks. Luckely I have my trusted tab 10.1 to use.
HANSB57 said:
Hi There all,
I bricked my device!
I installed multi window manager and ran the patch.
I should have not done this.
After one last message (something like copy binary from SD card) the device was dead.
Any help is highly appreciated
Click to expand...
Click to collapse
Its totally impossible that patching the FlashBarService.apk could completely brick your device... A Boot loop is possible, but not a brick.
Sent from my GT-N8013 using Tapatalk HD
Flashed the wrong recovery!
Hi there, Ive soft bricked my Note 8.0 by accidentally flashing Note 2 recovery. Anyone know how I can fix this? Stuck in boot screen. I can get to download mode and Odin recognizes it, but I have no idea what to do from there.
Any advice/help would be greatly appreciated..
no problem flash the note 8 recovery with odin
Sorry but I am new to soft brick. Have 3 rooted devices and never brick before. Can put device in download mode as kennielsen but I'm lost after that. Details on what to do and how to do it would be very nice, please!
Sent from my SM-N900V using XDA Premium 4 mobile app
Hi all
I got a notification of the latest software upgrade available for my device. I downloaded it and installed it. The installation process was shown to have reached 100% and then the phone screen went black and then did not turn back up. When I connect the phone to charger, I do not see any battery charging icon
I had my phone connected to the power outlet while I was upgrading? Is my phone bricked? Any way I can resolve this issue? My phone is out of warranty.
I have never ever rooted the phone. Not sure why would this happen with an official software upgrade.
Any help will be immensely appreciated
Are u able to enter recovery mode!
nick2408 said:
Hi all
I got a notification of the latest software upgrade available for my device. I downloaded it and installed it. The installation process was shown to have reached 100% and then the phone screen went black and then did not turn back up. When I connect the phone to charger, I do not see any battery charging icon
I had my phone connected to the power outlet while I was upgrading? Is my phone bricked? Any way I can resolve this issue? My phone is out of warranty.
I have never ever rooted the phone. Not sure why would this happen with an official software upgrade.
Any help will be immensely appreciated
Click to expand...
Click to collapse
Bro, hava read here....hopefully this will fix for u, FULL UNBRICKING TUT
http://forum.xda-developers.com/showthread.php?t=2725706
bodmar said:
Bro, hava read here....hopefully this will fix for u, FULL UNBRICKING TUT
http://forum.xda-developers.com/showthread.php?t=2725706
Click to expand...
Click to collapse
I was unable to go to recovery or download mode..
I took my phone to samsung service center and they told my motherboard has problems and it needs to be replaced.. huh
nick2408 said:
I was unable to go to recovery or download mode..
I took my phone to samsung service center and they told my motherboard has problems and it needs to be replaced.. huh
Click to expand...
Click to collapse
So its under warranty? Right? Or do u have to pay for the mess samsung created
doctor_droid said:
So its under warranty? Right? Or do u have to pay for the mess samsung created
Click to expand...
Click to collapse
I had to pay for it. It was out of warranty
nick2408 said:
I had to pay for it. It was out of warranty
Click to expand...
Click to collapse
Thats a really bad consumer behavior from an intl oem...
doctor_droid said:
Thats a really bad consumer behavior from an intl oem...
Click to expand...
Click to collapse
Why do you think so. I am quite sure my phone was hard bricked
nick2408 said:
Why do you think so. I am quite sure my phone was hard bricked
Click to expand...
Click to collapse
I meant behavior towards consumer... not ur fault mate...i knw how pathetic it can be to give away hard earned money when its nt our fault
Ridiculous move from Samsung IMO.
nick2408 said:
Hi all
I got a notification of the latest software upgrade available for my device. I downloaded it and installed it. The installation process was shown to have reached 100% and then the phone screen went black and then did not turn back up. When I connect the phone to charger, I do not see any battery charging icon
I had my phone connected to the power outlet while I was upgrading? Is my phone bricked? Any way I can resolve this issue? My phone is out of warranty.
I have never ever rooted the phone. Not sure why would this happen with an official software upgrade.
Any help will be immensely appreciated
Click to expand...
Click to collapse
Dear friend, Did you repair your phone my case is similar to yours.
agsao said:
Dear friend, Did you repair your phone my case is similar to yours.
Click to expand...
Click to collapse
Dear friend, just download your latest firmware at sammobile and flash it thru odin. Its the easiest and safest way to upgrade in my experience.
kaiserlourdes said:
Dear friend, just download your latest firmware at sammobile and flash it thru odin. Its the easiest and safest way to upgrade in my experience.
Click to expand...
Click to collapse
I could not open my phone and PC recognized it as unknown device.
agsao said:
I could not open my phone and PC recognized it as unknown device.
Click to expand...
Click to collapse
Search the forum on how to root and u can find there the Samsung USB drivers link. Download that
kaiserlourdes said:
Search the forum on how to root and u can find there the Samsung USB drivers link. Download that
Click to expand...
Click to collapse
Previously the PC was able to detect the phone (that mean the driver is installed successfully) but after this problem I can't turn on my phone ,and the screen is always blank.
agsao said:
Previously the PC was able to detect the phone (that mean the driver is installed successfully) but after this problem I can't turn on my phone ,and the screen is always blank.
Click to expand...
Click to collapse
can u explain how did you end up with blank screen when plug into PC?
did u go to download mode?
because mine was perfectly fine when plug into the PC.
kaiserlourdes said:
can u explain how did you end up with blank screen when plug into PC?
did u go to download mode?
because mine was perfectly fine when plug into the PC.
Click to expand...
Click to collapse
Dear friend,
My phone was stuck on logo screen.
I tried to full flash it using Odin I chooses all files except PDA files.
The phone accepted the flashing successfully
Phone restated and showing the android robot for updating
During this screen became black.
The result:
No response from phone it cann' be charged nor be turned on
I can't open the phone in any mode even download mode
When I plug my phone to the PC it's recognized as unknown device not as previous.
Thanks
agsao said:
Dear friend,
My phone was stuck on logo screen.
I tried to full flash it using Odin I chooses all files except PDA files.
The phone accepted the flashing successfully
Phone restated and showing the android robot for updating
During this screen became black.
The result:
No response from phone it cann' be charged nor be turned on
I can't open the phone in any mode even download mode
When I plug my phone to the PC it's recognized as unknown device not as previous.
Thanks
Click to expand...
Click to collapse
After successful flash the phone will reboot automatically and will stay on bootloop, while rebooting press and hols home+vol.up+power button. Then factory reset, wipe dalvik, wipe cache. Then reboot system..
Why not PDA? When i flashed stock rom i choose PDA and choose the file.
Auto reboot and f.reset time are the only checked boxes
kaiserlourdes said:
After successful flash the phone will reboot automatically and will stay on bootloop, while rebooting press and hols home+vol.up+power button. Then factory reset, wipe dalvik, wipe cache. Then reboot system..
Why not PDA? When i flashed stock rom i choose PDA and choose the file.
Auto reboot and f.reset time are the only checked boxes
Click to expand...
Click to collapse
Now I cannot flash it any more because the phone can't start in any mode neither download download mode nor recovery mode. ( may be hard bricked)
agsao said:
Now I cannot flash it any more because the phone can't start in any mode neither download download mode nor recovery mode. ( may be hard bricked)
Click to expand...
Click to collapse
one cannot hard bricked thru OTA update of official samsung. because i once update thru OTA and it updated successfully.
maybe it hard bricked when you flashed thru odin, maybe a wrong step.
i cant help you anymore brother, you can search this forum on how to unbricked device, u can try it. goodluck!
I installed the wrong firmware while I was trying to root my device(Samsung galaxy note 10.1 2014 edition). After that, the screen said that it failed to install firmware and a black screen appeared. I 've tried everything (including: Holding down Volume Down and Home buttons) but the screen remains black. Can someone help me recover the previous firmware?
theoko said:
I installed the wrong firmware while I was trying to root my device(Samsung galaxy note 10.1 2014 edition). After that, the screen said that it failed to install firmware and a black screen appeared. I 've tried everything (including: Holding down Volume Down and Home buttons) but the screen remains black. Can someone help me recover the previous firmware?
Click to expand...
Click to collapse
Try holding volume down + power , if you can get to download mode , then try flashing your appropriate rom again , if it fails , try installing this PIT file via odin http://forum.xda-developers.com/galaxy-note-10-2014/help/pit-stock-pit-file-thread-t2989266
The screen does not power on...
lsherif said:
Try holding volume down + power , if you can get to download mode , then try flashing your appropriate rom again , if it fails , try installing this PIT file via odin http://forum.xda-developers.com/galaxy-note-10-2014/help/pit-stock-pit-file-thread-t2989266
Click to expand...
Click to collapse
I tried that but nothing happened. The screen remains black. It seems that I 've installed the galaxy note 10.1 firmware instead of the galaxy note 10.1 (2014 edition) firmware while I was trying to root my tablet. I plugged it in my computer and I tried this key combination but the screen remains black.
theoko said:
I tried that but nothing happened. The screen remains black. It seems that I 've installed the galaxy note 10.1 firmware instead of the galaxy note 10.1 (2014 edition) firmware while I was trying to root my tablet. I plugged it in my computer and I tried this key combination but the screen remains black.
Click to expand...
Click to collapse
If you are sure your tablet is charged & still you can`t get into download mode ( just try charging it for couple of minutes & try volume down + power ) , if you couldn`t get this ,then unfortunately you have a bricked device .
Flashing incompatible firmware ends up with bricked devices.
The device is bricked because of the incompatible firmware.
lsherif said:
If you are sure your tablet is charged & still you can`t get into download mode ( just try charging it for couple of minutes & try volume down + power ) , if you couldn`t get this ,then unfortunately you have a bricked device .
Flashing incompatible firmware ends up with bricked devices.
Click to expand...
Click to collapse
I will charge it all night. Then I will try the key combination again. But, I think that because of the incompatible firmware the device is bricked.
I read about doing a volume up & power for over 30 sec. worked for me once.
Sent from my SM-T800 using Tapatalk
Did not work
woodsonmh said:
I read about doing a volume up & power for over 30 sec. worked for me once.
Sent from my SM-T800 using Tapatalk
Click to expand...
Click to collapse
It did not work. Thanks for the feedback!
theoko said:
It did not work. Thanks for the feedback!
Click to expand...
Click to collapse
This thread may help..worked for me
http://forum.xda-developers.com/showthread.php?t=2516013 (just make sure tou download the correct file for your tablet)
Last thing to try, if you can get your hands on a download mode dongle from the S2 days it might get you to download mode but this is a long shot. If you flashed the Note 10.1 2012 firmware you will probably have flashed the bootloader and as such be REALLY bricked.... The only way to fix might be to buy a "broken" note 10.1 with a bad screen or something and swap out the Main board... Just be aware you will inherit any problems associated with the new mainboard and will most certainly get a new IMEI/Serial number in the process....
Make sure it's not a mainboard that can't use your networks ie verizon with it's locked bootloader...