Database Develop

Galaxy Tab 8.9 3G Hard bricked?

I've tried to put a new ROM using Clockwork Recovery 6.0.1.2, during process it stuck for 4 hours and was turned off by power button.
After that tab don't react on power button, on pwr+vol up, pwr+vol down, pwr+ both vol buttons, nothing.
It even doesn't show battery icon when charging - screen is always black.
Any advices?
Thanks in advance.

I think the method described here will do the trick: http://forum.xda-developers.com/showthread.php?t=1478361
kallt_kaffe is having the same problem and he describes the procedure as: "basically tape down the power button to force a reboot cycle."

Aecidz said:
I've tried to put a new ROM using Clockwork Recovery 6.0.1.2, during process it stuck for 4 hours and was turned off by power button.
After that tab don't react on power button, on pwr+vol up, pwr+vol down, pwr+ both vol buttons, nothing.
It even doesn't show battery icon when charging - screen is always black.
Any advices?
Thanks in advance.
Click to expand...
Click to collapse
1. Put on your computer headphones and turn the volume up.
2. Plug your tablet into your computer via USB.
3. Hold the power button & Vol - keys together (Volume - is the side that is closest to the power button)
4. Listen for the "USB device connected" or "USB device disconnected" sound on your PC
5. If you can hear that, something has gone bad within the bootloader and the display does not initialize properly. Edit: The ICS installation does indeed attempt to patch the bootloader
6. If there is no sound, then the tablet is stuck in limbo, so go ahead and do the battery drain procedure as described in the above post.
7. If, however, your computer detects a device connecting and makes the sound, you can most likely still enter Download mode. You will have to do it blindfolded though:
-open ODIN 1.85 and see if it shows a connected device. If your PC made a connected sound, then there will most likely be a yellow COM port in ODIN.
- Hold [Power] & [Volume Down] together for 15 seconds or longer whilst monitoring your Device Manager windows to see if you can get the tablet out of APX mode and have it appear as another type of Device. Then press Volume+ several times with 1.5 sec. intervals. With luck, this should get you into Download mode, and ODIN will shine yellow for you.
- While doing all of the above keep your headphones on and listen for connected or disconnected sounds from your PC.
- Make sure you have this firmware for the P7300 which contains a bootloader, which is essential: http://www.hotfile.com/dl/162686792/c693269/P7300ZSKK2_P7300ZZHKK2_TGY.zip.html
- Flash with "Bootloader update" checked in ODIN and see if device is resuscitated. If the tablet boots, it will be in Hong-Kongish, but just select a language you recognize from the dropdown, it has them all.
- It may be a good idea to also throw in a .pit file and check Repartiton
N.B. The firmware link that I have provided is for the Tab 8.9 3G P7300 only! Do not flash it on another version of the 8.9!
You will need to search for a firmware that contains a bootloader.bin.md5 file for your tablet model.
Again, all of this will only be possible if the device registers with your PC on connecting the USB cable.

de3pkeeper said:
1. Put on your computer headphones and turn the volume up.
2. Plug your tablet into your computer via USB.
3. Hold the power button & Vol - keys together (Volume - is the side that is closest to the power button)
4. Listen for the "USB device connected" or "USB device disconnected" sound on your PC
5. If you can hear that, something has gone bad within the bootloader and the display does not initialize properly.
6. If there is no sound, then the tablet is stuck in limbo, so go ahead and do the battery drain procedure as described in the above post.
7. If, however, your computer detects a device connecting and makes the sound, you can most likely still enter Download mode. You will have to do it blindfolded though:
Click to expand...
Click to collapse
Ok, I've disassembled the device, and removed a battery connector for a time.
Didn't help though.
When I'm connecting tab to PC and holding pwr+vol_down, I hear that connect-disconnect sound and there is a device called
NVIDIA USB Boot-recovery driver for Mobile devices blinking in Device Manager with those sounds.
Odin shows no yellow com, all are empty, so download mode is not available.

you are stuck in APX mode , First go to this link and follow the instructions : http://forum.xda-developers.com/showthread.php?t=1130574]
if you get this in nvflash :
Nvflash started
rcm version 0X4
Command send failed (usb write failed)
this means your device is locked and the battery draining is that last thing that might work for you .
i still didn't try it, but i only disconnected the battery and connect it again but my device still dead for a month now .

DSHV said:
you are stuck in APX mode , First go to this link and follow the instructions : http://forum.xda-developers.com/showthread.php?t=1130574]
if you get this in nvflash :
Nvflash started
rcm version 0X4
Command send failed (usb write failed)
this means your device is locked and the battery draining is that last thing that might work for you .
i still didn't try it, but i only disconnected the battery and connect it again but my device still dead for a month now .
Click to expand...
Click to collapse
I'm getting exactly what you posted:
Nvflash started
rcm version 0X4
Command send failed (usb write failed)
and right after that tab disconnects from pc and disappear from devices list.
is it possible, that some Samsung Service Center will help me? I think that what I did voids the warranty, but anyway, I'm in Ukraine and getting official support here is almost mission impossible.

Aecidz said:
I'm getting exactly what you posted:
Nvflash started
rcm version 0X4
Command send failed (usb write failed)
and right after that tab disconnects from pc and disappear from devices list.
is it possible, that some Samsung Service Center will help me? I think that what I did voids the warranty, but anyway, I'm in Ukraine and getting official support here is almost mission impossible.
Click to expand...
Click to collapse
unfortunately the sbk (secure boot key) for locked Samsung devices is unknown and i was hoping that someone will be able to provide it since it's now increasing problem for 8.9 and 10.1 tabs especially after ics update . actually this is well known mode(apx) with all Nvidia Tegra devices such as acer a100 tablet and asus transformer ee pad but developers there were able to find the sbk for these devices .
if you are covered by warranty and the battery drain method didn't solve the problem you should go to Samsung and good luck . i am not covered by warranty and the only solution i found after connecting Samsung here in Egypt is replacing the mainboard costing almost as a new device (even Samsung couldn't fix it) .

DSHV said:
the only solution i found after connecting Samsung here in Egypt is replacing the mainboard costing almost as a new device (even Samsung couldn't fix it) .
Click to expand...
Click to collapse
Not very reassuring... Hope they will fix mine. I don't see any way to do it by myself.

Aecidz said:
Not very reassuring... Hope they will fix mine. I don't see any way to do it by myself.
Click to expand...
Click to collapse
Sounds like they want to get your cash.
If things went to sh*t software-wise, they can be fixed the same way.
They could just UART into the board and restore the bootloader. I don't have to expertise to do it, but they should have it.

1. Put on your computer headphones and turn the volume up.
2. Plug your tablet into your computer via USB.
3. Hold the power button & Vol - keys together (Volume - is the side that is closest to the power button)
4. Listen for the "USB device connected" or "USB device disconnected" sound on your PC
5. If you can hear that, something has gone bad within the bootloader and the display does not initialize properly.
6. If there is no sound, then the tablet is stuck in limbo, so go ahead and do the battery drain procedure as described in the above post.
7. If, however, your computer detects a device connecting and makes the sound, you can most likely still enter Download mode. You will have to do it blindfolded though:
Click to expand...
Click to collapse
1-7 okay. And device is "NVIDIA USB Boot-recovery driver for Mobile devices", not APX (because i installed special driver).
But nothing happend when i try to enter Download mode.
USB Disconnect > Connect > Pressing power and vol button for ~7 seconds (why 15+?.. So 15 i tried too) > Sound > Pressing V+ 10 times... Nothing glows in Odin.

eskimono said:
1-7 okay. And device is "NVIDIA USB Boot-recovery driver for Mobile devices", not APX (because i installed special driver).
But nothing happend then i try to enter Download mode.
USB Disconnect > Connect > Pressing power and vol button for ~7 seconds (why 15+?.. So 15 i tried too) > Sound > Pressing V+ 10 times... Nothing glows in Odin.
Click to expand...
Click to collapse
I had a broken bootloader and my display was dead the same way all of youse with bricked tabs describe.
It appears that in your case the bootloader is so badly messed up, that a fail-safe kicks in and sends the tab into APX mode directly.
Consider disassembling your device to disconnect the battery, press Power a few times with ti disconnected and keep it disconnected for a minute or so to force discharge of all capacitors, then reconnecting and attempting a reboot.
Disassembly is really easy - get a plastic knife and stick it under the display near the charging port and work your way around the whole unit. The entire display comes out of the back cover. Flip the display around and there you will notice where the battery connects to the main board, unplug the connector.

Have you tried?
And wut i must do after that?
---------- Post added at 11:46 AM ---------- Previous post was at 11:11 AM ----------
Disassemble, disconnect battery, press power, short + and - (on device, not on battery lol)... After that connect battery and connect via usb ... the same. cant enter download menu.(

Will try this > http://forum.xda-developers.com/showthread.php?t=1478361
If wont work - service center

Aecidz said:
I've tried to put a new ROM using Clockwork Recovery 6.0.1.2, during process it stuck for 4 hours and was turned off by power button.
After that tab don't react on power button, on pwr+vol up, pwr+vol down, pwr+ both vol buttons, nothing.
It even doesn't show battery icon when charging - screen is always black.
Any advices?
Thanks in advance.
Click to expand...
Click to collapse
Hi, may I know what new ROM did you flash? And your previous ROM before flashing. So that we can all avoid that ROM until somebody can fix this mess cause by brickbug. Thanks.

Nah. Samsung service sucks.
They said that motherboard should be replaced.
I don't understand how software problem couldn't be fixed w/o hardware replacement.
Screw that, I'll go get Nexus 7.

nexus_g said:
Hi, may I know what new ROM did you flash? And your previous ROM before flashing. So that we can all avoid that ROM until somebody can fix this mess cause by brickbug. Thanks.
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=1789464 <- that one. Version with N7UI (Build 11 Beta 9: (link) (Stable Build)(N7UI))
Not sure if it's ROM problem though.
Maybe it's just my karma.

Aecidz said:
http://forum.xda-developers.com/showthread.php?t=1789464 <- that one. Version with N7UI (Build 11 Beta 9: (link) (Stable Build)(N7UI))
Not sure if it's ROM problem though.
Maybe it's just my karma.
Click to expand...
Click to collapse
Actually it turns out to be the problem with CWM 6.0.1.2. You should use 6.0.0.8 or less.

manpete said:
Actually it turns out to be the problem with CWM 6.0.1.2. You should use 6.0.0.8 or less.
Click to expand...
Click to collapse
too late anyways.
but thanks for the info.

de3pkeeper said:
I had a broken bootloader and my display was dead the same way all of youse with bricked tabs describe.
It appears that in your case the bootloader is so badly messed up, that a fail-safe kicks in and sends the tab into APX mode directly.
Consider disassembling your device to disconnect the battery, press Power a few times with ti disconnected and keep it disconnected for a minute or so to force discharge of all capacitors, then reconnecting and attempting a reboot.
Disassembly is really easy - get a plastic knife and stick it under the display near the charging port and work your way around the whole unit. The entire display comes out of the back cover. Flip the display around and there you will notice where the battery connects to the main board, unplug the connector.
Click to expand...
Click to collapse
My tab was bricked and I followed your post but there is ghost, my tab is still on after 4 hours without the big battery, the secondary battery is so strong (I dont know where its placed)... I dont know how to drain it fastest.
the big battery connector are 5 wires, 2 red, 1 blue and 2 black, are they????

de3pkeeper said:
7. If, however, your computer detects a device connecting and makes the sound, you can most likely still enter Download mode. You will have to do it blindfolded though:
-open ODIN 1.85 and see if it shows a connected device. If your PC made a connected sound, then there will most likely be a yellow COM port in ODIN.
- Hold [Power] & [Volume Down] together for 15 seconds or longer whilst monitoring your Device Manager windows to see if you can get the tablet out of APX mode and have it appear as another type of Device. Then press Volume+ several times with 1.5 sec. intervals. With luck, this should get you into Download mode, and ODIN will shine yellow for you.
- While doing all of the above keep your headphones on and listen for connected or disconnected sounds from your PC.
- Make sure you have this firmware for the P7300 which contains a bootloader, which is essential: http://www.hotfile.com/dl/162686792/c693269/P7300ZSKK2_P7300ZZHKK2_TGY.zip.html
- Flash with "Bootloader update" checked in ODIN and see if device is resuscitated. If the tablet boots, it will be in Hong-Kongish, but just select a language you recognize from the dropdown, it has them all.
- It may be a good idea to also throw in a .pit file and check Repartiton
Click to expand...
Click to collapse
My tab has a blank screen and went through the steps you mentioned. ODIN has a yellow com port and when I try to flash the firmware+bootloader ODIN stops in "SetupConnection".. I tried to change port, cable, odon version to no avail. Any ideas? Thanks!

[Q] Help needed in strange thing at GT-P7300

Hello for Everyone!
I've a SAM Galaxy TAB 8.9 (GT-P7300) branded for T-Mobile (TMH). There are few of strange things about it.
The first: can not communicate with my PC and with my laptop. On PC runs WIN7 x86, on laptop I use Ubuntu 10.4 (Studio). I had installed the USB drivers for WIN, and the only thing is happened after plugging the USB-cable WIN wrote: "Can't identifying the plugged in Android device". The Ubuntu doesn't recognize my tablet
The second: I can not reach the Bootloader mode, download mode. When I push the VOL down at same time with the POWER ON nothing happens.:crying:
The third: after some minutes of sleeping mode of the device (for example: charging, not using) it POWER OFF. Or...something like this...blank black display and nothing happens if I push any of the buttons. Pushing about 20 secs of POWER ON button resulting a reboot.
The device is in stock 3.2 .
Any ideas what can I do for rooting process nad for custom ROM?

simpleimage said:
Hello for Everyone!
I've a SAM Galaxy TAB 8.9 (GT-P7300) branded for T-Mobile (TMH). There are few of strange things about it.
The first: can not communicate with my PC and with my laptop. On PC runs WIN7 x86, on laptop I use Ubuntu 10.4 (Studio). I had installed the USB drivers for WIN, and the only thing is happened after plugging the USB-cable WIN wrote: "Can't identifying the plugged in Android device". The Ubuntu doesn't recognize my tablet
The second: I can not reach the Bootloader mode, download mode. When I push the VOL down at same time with the POWER ON nothing happens.:crying:
The third: after some minutes of sleeping mode of the device (for example: charging, not using) it POWER OFF. Or...something like this...blank black display and nothing happens if I push any of the buttons. Pushing about 20 secs of POWER ON button resulting a reboot.
The device is in stock 3.2 .
Any ideas what can I do for rooting process nad for custom ROM?
Click to expand...
Click to collapse
On your second point, to reach bootloader, turn on tab, wait until the moment the samsung logo pops up, then press volume down (the one closer to power button).
To root, add custom recovery and ROM, read the stickies in the android development forum. These may help your other problems. There are several reasons why your computers fail to recognize your tab. I would try different usb ports and cords if you can. I would install kies on the windows pc and see if that recognizes the tab. If none of that works, it may be a hardware problem.

upconvert said:
On your second point, to reach bootloader, turn on tab, wait until the moment the samsung logo pops up, then press volume down (the one closer to power button).
To root, add custom recovery and ROM, read the stickies in the android development forum. These may help your other problems. There are several reasons why your computers fail to recognize your tab. I would try different usb ports and cords if you can. I would install kies on the windows pc and see if that recognizes the tab. If none of that works, it may be a hardware problem.
Click to expand...
Click to collapse
Thanx for your quick reply. There are few cganges about the problems. Here they are:
The second problem about the bootloader and download mode is off. I picked parts of the device and there was a liitle problem with the VOL buttons...repaired and everything is fine with it.
The first problem about the communication is half-solved. On SAMSUNG laptop without (!!!) any drivers works fine the device. Flashed with a "stock" 4.0.4 (Checz) no boot, just splashed on the SAMSUNG logo. After ODIN-flashed one-file other ROM it was very nice...everything goes.
But the third problem is here after the good-flashing, too. In sleep mode or long not-usage periods it is something like POWER OFF.... During the picking to parts period some of the pieces (battery, flexes) were supervised...everything is normal. I think the device's main panel is wrong, but I don't know how I could look at it and fix it.

[Q] Bootloader gone?

I have a standard SM-N700 Galaxy Gear and had it running null. All seemed fine until one night after a notification tried to come to the watch, the screen flashed white and the watch appeared to shut down. Since then, it hasn't been able to turn on for anything. Below is the steps I've taken to try to recover my smartwatch...
Tried using multiple power supplies, no response (one power supply even caused the charging dock to become a little warm)
Tried holding power for 10 seconds, no response.
Tried repeatedly holding/pressing power (I heard sometimes this can help clear a softlocked device), no response.
Opened the watch and disconnected the battery. When the watch was reconnected, it vibrated once as if it was going to turn on, but didn't do anything further. Repeated attempts at removing the battery had no response, not even a vibrate.
Tried connecting the watch to my PC, the computer beeped that a device was connected and reported that there was no driver for "sec s5pc210 test b/d". I checked and the standard Samsung USB Drivers are installed. Tried other USB cables and USB ports, either the computer gives the beep of a malfunctioning USB device, or beeps as if something connected, but then the device seems to disappear.
I've read some resources that suggest that either the watch is completely fried, or somehow during an update to Gear Manager, it corrupted or damaged the bootloader of the watch, and after the watch attempted to reboot, it failed and got stuck in the condition it is in now. Based on these resources, there's supposed to be a way using Odin to flash a proper bootloader to the device, but since it does not appear to stay connected for more than an instant, and when it does connect it appears as this "sec s5pc210 test b/d" device, the tools I've tried to flash the bootloader have failed.
I really don't want to have to replace this device. Having a Samsung watch that still runs plain Android is not something I want to give up.

Galaxy Tab 10.1wifi is going to be thrown out the window !

Ok so this will be my second post, no one replied to my first.
Will try to explain what the problem is. in as much detail as I can.
Please help me out guys !
So, tab was in debug mode, messed up using odin, trying to root, not sure what went wrong there and gave up.
Rest of the day tab worked fine.
During the night it was not turned off but left on charger, icon showing.
I listen to audio book while falling asleep
When I woke up, pressed on and nothing, black screen
Panic and frustration followed.
New charge cable, black screen
Searched internet, did the button combo's , took back off, disconnected battery, drained battery, still black screen.
Disconnected all cables inside, reconnected, black screen
Conncted to win7 pc, by holding down power and vol down, pc sees unknown device in APX mode.
Installed various drivers, all I could find that might work, installed and seen in device manager.
Followed nvflash guides, get an error usb write failed.
List devices command, nothing appears.
Installed Samsung Kies. cant connect , using different drivers also.
Odin cant see the device either. Pdanet installed, same outcome.
Also the sdk route, always no device found
I havent got new battery yet, cant afford one at the moment.
With everything I tried it always comes down to device not being seen even though it does appear in device manager.
Installed usbdevieuw software , check the properties, it does say 0mA , which is different to when I check my usb keyboard or mouse, they do have power 90mA etc. which is weird.
I have read and tried just about everything concerning my specific device. I am stuck.
No idea what to try next.
I understood that apx = download mode., which would be fine if I could see something on the tab screen. I know that normally when into download mode you have to use vol up to cross over to the right icon.
So, power + vol down... wait till its in device manager on pc, then vol up. Tried this, seeing as the screen is black I just waited a bit and then vol up, guess work actually.
Anyway, if someone has any ideas etc please let me know.
Thank You All

Try This
TabBabe said:
Ok so this will be my second post, no one replied to my first.
Will try to explain what the problem is. in as much detail as I can.
Please help me out guys !
So, tab was in debug mode, messed up using odin, trying to root, not sure what went wrong there and gave up.
Rest of the day tab worked fine.
During the night it was not turned off but left on charger, icon showing.
I listen to audio book while falling asleep
When I woke up, pressed on and nothing, black screen
Panic and frustration followed.
New charge cable, black screen
Searched internet, did the button combo's , took back off, disconnected battery, drained battery, still black screen.
Disconnected all cables inside, reconnected, black screen
Conncted to win7 pc, by holding down power and vol down, pc sees unknown device in APX mode.
Installed various drivers, all I could find that might work, installed and seen in device manager.
Followed nvflash guides, get an error usb write failed.
List devices command, nothing appears.
Installed Samsung Kies. cant connect , using different drivers also.
Odin cant see the device either. Pdanet installed, same outcome.
Also the sdk route, always no device found
I havent got new battery yet, cant afford one at the moment.
With everything I tried it always comes down to device not being seen even though it does appear in device manager.
Installed usbdevieuw software , check the properties, it does say 0mA , which is different to when I check my usb keyboard or mouse, they do have power 90mA etc. which is weird.
I have read and tried just about everything concerning my specific device. I am stuck.
No idea what to try next.
I understood that apx = download mode., which would be fine if I could see something on the tab screen. I know that normally when into download mode you have to use vol up to cross over to the right icon.
So, power + vol down... wait till its in device manager on pc, then vol up. Tried this, seeing as the screen is black I just waited a bit and then vol up, guess work actually.
Anyway, if someone has any ideas etc please let me know.
Thank You All
Click to expand...
Click to collapse
This same thing happened to me a while back...I used a program called Root With Restore by Bin4ry v18. Look it up, I think it might help you.

galaxy tab 10.1
lordhavmercy said:
This same thing happened to me a while back...I used a program called Root With Restore by Bin4ry v18. Look it up, I think it might help you.
Click to expand...
Click to collapse
Thank you !! for responding. I did as you suggested, Its cool software.
that being said, no matter what option I choose I get The system cannot find the path specified. To me that means that the tablet cannot be entered even though it does show up in device manager samsung android phone> android adb interface.
I mailed samsung help desk and got a reply saying, take it to your nearest samsung repair store. .. THEY can fix it......as I expected they would say.
Im still wondering if the battery is causing the problems. As screen is black, when on charger stays black.
However if the tab is seen on my pc, does this mean tab has power?????
I have no idea how to test the battery without replacing it.
Im guessing tab is fully bricked and if so would that explain the no battery charging icon??? and lack of any other screens lol :laugh:
Anyway, I have learnt so much from reading this forum. I admire the great work and assistence provided.
Guess my tab problem is either too easy to provide a fix for or hardly no one has a clue how to fix my tab :silly:
Please respond and help me out!!!

Oneplus 3t not work

Hi all .. I have a phone but nothing appears on the screen and when I connect the phone to the charger shows the sign of the charger until the green sign appears, which means full battery .. What do these things show? Is the screen damaged or motherboard problem ? Please Help

Try holding the power button down for 10 seconds or more, and see if there is any change. Also try power+vol up (which normally boots to bootloader) and hold for 10 seconds or more.
Jnoubileb said:
when I connect the phone to the charger shows the sign of the charger
Click to expand...
Click to collapse
You mean the charging animation on the screen, or just the LED charge light?
If it's showing the charge animation, your screen is okay. And at least have a working bootloader, as well.

redpoint73 said:
Try holding the power button down for 10 seconds or more, and see if there is any change. Also try power+vol up (which normally boots to bootloader) and hold for 10 seconds or more.
You mean the charging animation on the screen, or just the LED charge light?
If it's showing the charge animation, your screen is okay. And at least have a working bootloader, as well.
Click to expand...
Click to collapse
thanks for your replying >>
i mean the led charge light ..also when i connect my phone to laptop , all files on memory appear

Jnoubileb said:
thanks for your replying >>
i mean the led charge light ..also when i connect my phone to laptop , all files on memory appear
Click to expand...
Click to collapse
I gave another suggestion about holding the power/vol buttons. I have no idea if you tried, and if so, whether there was any change.
Reading the files on internal storage to me, means the phone is booted to OS. So I agree that it appears the phone is on, but screen is either not working, or somehow darkened all the way.
What is the history of this device, and did anything happen before the current condition? Did it just happen spontaneously, or did you drop it or try to open it to fix anything? Try to install anything? Is the phone modified at all (TWRP, root, etc.) or basically still stock? Even if it happened spontaneously, did it happen when you were using it (and if so, what were you doing exactly)? Or just picked it up and it was this way?

I try to press power button 10 sec and more and power+ vol+ nothing happened on screen just vibrate ....the problem for my phone appear without any open to phone

Jnoubileb said:
I try to press power button 10 sec and more and power+ vol+ nothing happened on screen just vibrate ....the problem for my phone appear without any open to phone
Click to expand...
Click to collapse
Do you have debugging turned on? Know how to use adb?

i think is on before the problem appear

Jnoubileb said:
i think is on before the problem appear
Click to expand...
Click to collapse
Then connect the phone to a computer, type:
adb devices
And see if your phone's ID is returned, or if there is an error or just hangs "Waiting for device".
If it returns your phone's ID, then the phone is booted to OS (or alternately, booted to custom recovery will also allow adb connection). So to me, this means the phone is on, but the screen is not working (not displaying anything) like you suggested. adb won't connect if the phone is not on (and booted to OS).

redpoint73 said:
Then connect the phone to a computer, type:
adb devices
And see if your phone's ID is returned, or if there is an error or just hangs "Waiting for device".
If it returns your phone's ID, then the phone is booted to OS (or alternately, booted to custom recovery will also allow adb connection). So to me, this means the phone is on, but the screen is not working (not displaying anything) like you suggested. adb won't connect if the phone is not on (and booted to OS).
Click to expand...
Click to collapse
the phone now on mtp mode
C:\WINDOWS\system32>adb devices
adb server is out of date. killing...
* daemon started successfully *
List of devices attached
3a55e345 unauthorized

So it looks like adb is connecting. I think it is saying "unauthorized" since the phone's screen is trying to prompt you to authorize adb commands (which you obviously can't see or respond to). But it is obtaining the device's ID code. Which by the way, is unique to your device. So I would advise to remove it from your previous post. Don't know if it is dangerous for other folks to have this, but better safe than sorry. Simply telling us that an ID code was returned, would have been sufficient.
Moral of the story, I am thinking the phone is booted to OS, just the screen is not displaying anything. Screen may be broken, as you somewhat were guessing from your top post. I suppose there is a possibility it may be some software fault. You can try to eliminate this as the cause, by possibly booting to bootloader, which should allow fastboot access, then flash a stock recovery image. Although it may be tricky without seeing the display. Since if you need to see the display, or select anything during the process (don't recall if you do or not), you are out of luck.
Although I tend to think this is a hardware issue. Screen may be malfunctioning. Or it may be as simple as a loose connector.