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[Q] Tf300 dead after changing digitizer?

I got my tf300 some time ago, and just today i recieved all the components needed in order to change it;note that the tablet was disasembled for more than a month, but before that, the battery was charged, so it remained like a month like that as well i don't have best memory of the disasembly proceedure.
So today, i managed to pack it back (without putting the back cover of the tablet, and tried to boot it, but nothing happened.So i put it on the charger where a sound (charging sound) beeped and a red led turned on (later green).I let the tablet charging for more than half an hour, and tried to boot it again but no sign of life at all.I removed all the screws etc and disassembled it for one more time in order to check if everything was put right.
Both digitizer cables was secured.
Screen cable was fine.
Also i tried to check the on and volume rockers cable and by mistake i ruined the plastic top of the female adaptor, but the cable still fits fine inside (that happened during the second disassebly so it was not the original cause for sure).
Also, i noticed that there is an on/off switch next to the power button.This switch was ON the whole time.
I found a button at the digitizer circuit and pressed it (tablet off).
I've tried to remove the digitizer and try to boot.Nothing happened.
What i am afraid of, is that the whole proceedure make me burn some circuit of the tablet by static electricity or by sort-circuit something by my slightly swetty hands.

TheoKondak said:
I got my tf300 some time ago, and just today i recieved all the components needed in order to change it;note that the tablet was disasembled for more than a month, but before that, the battery was charged, so it remained like a month like that as well i don't have best memory of the disasembly proceedure.
So today, i managed to pack it back (without putting the back cover of the tablet, and tried to boot it, but nothing happened.So i put it on the charger where a sound (charging sound) beeped and a red led turned on (later green).I let the tablet charging for more than half an hour, and tried to boot it again but no sign of life at all.I removed all the screws etc and disassembled it for one more time in order to check if everything was put right.
Both digitizer cables was secured.
Screen cable was fine.
Also i tried to check the on and volume rockers cable and by mistake i ruined the plastic top of the female adaptor, but the cable still fits fine inside (that happened during the second disassebly so it was not the original cause for sure).
Also, i noticed that there is an on/off switch next to the power button.This switch was ON the whole time.
I found a button at the digitizer circuit and pressed it (tablet off).
I've tried to remove the digitizer and try to boot.Nothing happened.
What i am afraid of, is that the whole proceedure make me burn some circuit of the tablet by static electricity or by sort-circuit something by my slightly swetty hands.
Click to expand...
Click to collapse
Uhh, the on/off button should be always on ON if you are turning on the tablet, always have it like that...
Also, make sure that the digitizer's end is well plugged

TheoKondak said:
I got my tf300 some time ago, and just today i recieved all the components needed in order to change it;note that the tablet was disasembled for more than a month, but before that, the battery was charged, so it remained like a month like that as well i don't have best memory of the disasembly proceedure.
So today, i managed to pack it back (without putting the back cover of the tablet, and tried to boot it, but nothing happened.So i put it on the charger where a sound (charging sound) beeped and a red led turned on (later green).I let the tablet charging for more than half an hour, and tried to boot it again but no sign of life at all.I removed all the screws etc and disassembled it for one more time in order to check if everything was put right.
Both digitizer cables was secured.
Screen cable was fine.
Also i tried to check the on and volume rockers cable and by mistake i ruined the plastic top of the female adaptor, but the cable still fits fine inside (that happened during the second disassebly so it was not the original cause for sure).
Also, i noticed that there is an on/off switch next to the power button.This switch was ON the whole time.
I found a button at the digitizer circuit and pressed it (tablet off).
I've tried to remove the digitizer and try to boot.Nothing happened.
What i am afraid of, is that the whole proceedure make me burn some circuit of the tablet by static electricity or by sort-circuit something by my slightly swetty hands.
Click to expand...
Click to collapse
"...I found a button at the digitizer circuit and pressed it (tablet off)...". How do you mean? If you're referring to the reset button on the Touchscreen pcb, that usually does not turn anything off, just resets to boot the tab again. In any case, you said "tablet off", meaning it was "on" before that? How do you tell it was on then? One way to find out would be to hook it up to a tv via HDMI. If it comes on, either the lcd or the cable is the problem. I've run into a situation where the tab works (comm. thru PC) but the graphics part is dead, hence no display, in which case the only solution would be a new motherboard as graphics reside within the CPU.

I mean it was turned off before i press the button.I will try to find a cable in order to check it on TV, but if hte GPU is dead how the HDMI works?By the way,i just tried to plug the tablet to my PC, and the PC recognize the device!That probably means that the device is on,but something goes wrong with the display.

TheoKondak said:
I mean it was turned off before i press the button.I will try to find a cable in order to check it on TV, but if hte GPU is dead how the HDMI works?By the way,i just tried to plug the tablet to my PC, and the PC recognize the device!That probably means that the device is on,but something goes wrong with the display.
Click to expand...
Click to collapse
If the GPU is dead then of course there won't be any display. But how do you find out? With the HDMI connection.

[Q] Telstra One XL wont turn on after screen replacement

Hi Everyone,
I'm have a problem with my One XL. It's an Australian Telstra item. I got soaked in the rain and the phone got wet. I put it in rice for a few days to soak up the moisture, then charged it up. After this the screen backlight would intermittently fail, and i noticed if I squeezed the LHS of the phone it would sometimes make the screen go on or off. The problem got worse over the space of about an hour and eventually the screen would not come on. I opened up the case, and noticed there was a split in the ribbon cable that is part of the screen at the point that it is folded over 90deg (I'm not sure why this was never a problem before the phone got wet?)
So I stupidly got straight stuck into taking it apart to replace the screen before backing up all my stuff. I ordered a new screen of ebay and replaced the old one. Now I am having the following behaviour:
1-Press and hold power button - Phone vibrates once, then does nothing. Screen doesn't come on.
2-Plug into PC - LED flashes red for a while then goes solid red. Screen doesn't come on. Nothing pops up in "My computer"
3-Press and hold (~10sec) power after 2 - Red light goes off. Phone vibrates once every ~30 seconds. Screen doesn't come on.
4-Press and hold power after 3 - Home/Back/Apps LEDs flash 20 times, no other change.
I also tried a number of combos of power + vol -/+ with no success.
Also, I was being lazy and doing this without putting the case back on, and my power button has fallen apart. It looks like that ribbon cable is only ~$5 on ebay, so no big deal, but means I cant really do anymore troubleshooting at the moment.
So I guess the big question is, can the phone still be salvaged? I'm thinking maybe it's stuck in a boot loop with the screen also not working?
Any help is greatly appreciated.
Cheers,
Chris

The first question I have would be did you make sure you got the right screen? There are three different types of screens that came on this phone and you need to make sure you match it correctly. You can identify the type of screen by the colour of the flex cable attached.
Secondly, you should never use the power + volume up button combination, I'm not sure where you saw that information but it puts the phone into Qualcomm download mode which you definitely don't want. The only button combination that should ever be used is power + volume down.
Sent from my Evita

Hi Timmaaa,
Both screens had the same orange/brown flex cables. I did read that there were different screens, but had thought there were only two and that the other had a green flex, so I definitely didn't get that one. Are the other 2 colours close?
I'm not sure where I read the power + volume up thing as I have read a heap of different threads. What would the expected behaviour be if I had put it into that mode?
Thanks for your help.
Cheers,
Chris

The three different screens have very different colour coding on the flex cable, so matching should be a piece of cake, which I believe you've done correctly. Putting the phone into Qualcomm download mode is kinda like a bricked state, if you're getting the red charging led and the cap button lights flashing I think you're ok.
Another thing to note is that you usually need to sync your new screen when you install it. From memory I believe you need to power the phone on, remove the old screen while the phone is on, and install the new screen while the phone is on. If you didn't follow this process that might be why your display isn't working. Other than that your phone might have just suffered some fatal hardware damage due to the liquid ingress, which isn't going to be fixable.
Sent from my Evita

Thanks again Timmaaa,
I had a closer look at my old screen and it does have the small green section on the flex cable which I didn't notice the first time around. Bugger.
So i disassembled it again and swapped back to the old screen. The display still doesn't turn on, but the phone itself now stays on and the computer recognises it! I'm transferring all my photos across to my computer now, then I'll try to sync it properly and see if that helps.
Cheers,
Chris

Ok so I swapped the screens back and forth with the power on, and now it's working! Thanks Timmaaa, I would never have guessed I needed to have the phone turned on in order to swap parts, seems pretty weird. Now just got to get a new power button.
Cheers,
Chris

Awesome. Glad to be able to help.
Sent from my Evita

Samsung galaxy s6 completely dead. Will not power on or charge

Hey guys, So i was using my Samsung Galkaxy S6 one day when the screen went dead. Now it will not turn on or charge, I have tried using 3 different chargers and tried to use all of the button combinations to reset it and boot it into all the different modes. I have even tried to just let it charge for half a day but nothing. Does anyone know whats wrong with it, whether i can save it or if i'll have to get a replacement? I have emailed Samsung but they still haven't replied yet. It is running stock android not rooted and when i plug the charger in the device gets warm but will not turn on or show any signs of life
Cheers everyone x

Try POWER + VOLUME DOWN

CRiSTiANVASiLE said:
Try POWER + VOLUME DOWN
Click to expand...
Click to collapse
Like i said in my post I have tried every button combination including Volume down + Power button. Thanks for the thought though

When you plug it into the computer does the computer see it ?
If yes, then your screen may need replacing. If No there maybe a problem on your motherboard.

Cosmic Blue said:
When you plug it into the computer does the computer see it ?
If yes, then your screen may need replacing. If No there maybe a problem on your motherboard.
Click to expand...
Click to collapse
The computer does not recognise it either. What you said about the motherboard must be the problem then. Do you have any idea how the motherboard could have been damaged and whether it was a hardware failure or my fault?

Easy on the MB replacement! They're the most expensive thing on the phone. Try the USB port/daughter board 1st. About $6 on eBay. After that if no joy- have to swap in a power amplifier. Here's a link how to
https://www.youtube.com/watch?v=x__8r-UiCSo&feature=youtube_gdata_player
Not fun but might be necessary. I'll bet it's not your MB.

[Completed] HTC Desire 826 Screen Blackout

My friend got his new HTC Desire 826 in July 2015. He is having issue with his phone, the screen totally blackouts. He doesn't want to repair the phone because it has no more warranty and will cost much to repair. He asked my help to recover any data possible from his phone.
This was the info I got from him: The phone would restart itself once in a while in the recent few months of use (almost the time that the warranty ended). The screen would black out sometimes, a physical hit on the phone helped to recover it. At the last few moments before the screen totally blackout, the screen showed the mirror image of what it's suppose to show (he had to put it in front of a mirror to read the message). And then it just died and never come alive again. He can't remember whether he set the phone to silent mode.
What I did: Removed and put in the battery, pressing power button gives me a short vibration (I assume that means it can be turned on). Dissemble and reassembled the boards, flex cables etc. No burn mark or broken connection seen. Connect to TV using MHL cable, no signal detected. Soft reset by pressing POWER + VOLUME UP button, it vibrated and screen was still black. Since then, charging after turn on doesn't shows red light below the front camera. The metal cover above the motherboard was usually very hot whenever the phone is on. I'm working like I'm blind, omg >_<.
What's wrong with the phone? What should I do? Possible to repair? Some questions I'd like to ask.
1) Using MHL, does the phone screen need to be working then the TV will show what's on the phone screen?
2) Is there anyway I can connect the phone to other external screen and control externally?
3) I'm hesitant to repair the phone, the heating up of the motherboard scares me that the phone won't last long even after repair. Anyone has this phone and how do u go about this heating issue?

Hi
Try asking in the link below as we dont have a forum for your friends device
http://forum.xda-developers.com/android/help
Good luck

Unresponsive / Dead Phone - Any ideas?

So i recently picked up an XT1254 for a great deal. The phone is pristine, not a scratch on it. It looks brand new. It is totally unresponsive. If I plug it in the light on my charger turns from blue to green, telling me it's fast charging. But nothing from the phones LED. Also if I place it on a charging pad, color changes as well. I tried both options over night and still nothing. The phone does get warm (usual amount), leading me to believe it is charging the battery.
Holding the power button - nothing (no vibration, no moto logo, no LED responce)
Holding power + vol down - nothing ( = )
USB to PC - phone is not detected at all (I have ADB and current moto drivers installed)
I opened it up, and everything seems to be in order. No loose connections, no water damage. I checked the battery, and it reads roughly 2.5 volts across each pair of pins. Should it be reading 3.7-4 volts across each pair?
I unfortunately don't have another phone to check the MB, battery and LCD against.
I don't have a SIM installed in it, but I doubt it makes a difference?
Any ideas or advice would be greatly appreciated! Thanks-

alexacm said:
I checked the battery, and it reads roughly 2.5 volts across each pair of pins. Should it be reading 3.7-4 volts across each pair?
Click to expand...
Click to collapse
Quite low for li-ion/-poly, I don't think it ever sees 3v or under in normal circumstances. It might be well into "damaging the battery" territory at this point, and it should certainly be higher after charging it for a while...might be a goner.
Have you tried removing the battery completely and running it off the USB cord? I would expect it to, if nothing else, bring the screen up complaining of a bad/missing battery. That said, I've never tried unplugging mine to see what happens, so no real idea.
I would suggest trying to fabricate a factory cable (which would provide power directly, ignoring battery status), but I don't know if post-OMAP Motorolas are physically configured to use them. If they aren't, it'll do nothing at best and burn up traces at worst : \
Also, holding Vol - while plugging it in should bring the boot menu up, regardless of available battery charge (therefore serving as a quick test to see if the power button is the problem). But that might go out the window as well if the battery is deader than a doornail.
alexacm said:
I don't have a SIM installed in it, but I doubt it makes a difference?
Click to expand...
Click to collapse
It doesn't. When I fresh-install a ROM, I remove my SIM card to make sure none of my data gets used before I can turn various unwanted syncs/auto-updates off. The phone doesn't care at all, and nowadays Google isn't too whiny about a missing SIM either.

Hello guys.
Sorry for reviving an old thread, but I have similar problem with my Droid Turbo. During the replacement of the battery and speaker, I noticed oxidized resistors near the proximity sensor (which wasn't working since the purchase of the phone second-hand). I have cleaned the oxidized residue with ethanol and assembled the phone. After pressing the power button, the touch buttons light up and phone was vibrating every 20s but the screen was blank. So I disassembled it again to check all the connections but everything was fine. Since then, the phone won't even vibrate, just heats up a lot after holding power button. I have tried both batteries, speakers and also powering the phone without battery (only power cord connected). Both batteries are shoving around 3.8V.
Do you please have any suggestions how to fix the phone? Or should I assume that the motherboard died?
Thanks