Is it possible the motherboard is borken? - Xperia Z2 Q&A, Help & Troubleshooting

I dropped my phone. The screen shattered and was if fingers were touching it all at once. I got the screen replaced, no problem. But then both cameras are not working and display a blank screen. I took it into a shop and they said the cameras appear to be fine. I took it into another shop and they said the cameras are fine and that it's very rare for both cameras (let alone one) to be physically damaged from a drop. They told me to try flashing the phone. I did and it did not fix the problem. The phone detects the cameras, so how can it possibly be damaged? The technician said he checked the motherboard but possibly could be a part he didn't check.

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[Q] Thunerbolt soft keys (not working)

Hi, i have a thnderbolt and i recently replaced the LCD and digitizer. I powered it up and was working fine for a few minutes and then the soft keys stopped working and certain parts of the Digitizer. The LCD display id perfect and looks perfect. The parts of the digitzer/screen that do work, work great, its almost like its divided into zones. Ive done digitizer replacement before and i went back to check all the ribbon cables, none seem to be damaged or not connected. I dont know what to do ive tried everything i know what to do , please HELPPP!!
jbone00 said:
Hi, i have a thnderbolt and i recently replaced the LCD and digitizer. I powered it up and was working fine for a few minutes and then the soft keys stopped working and certain parts of the Digitizer. The LCD display id perfect and looks perfect. The parts of the digitzer/screen that do work, work great, its almost like its divided into zones. Ive done digitizer replacement before and i went back to check all the ribbon cables, none seem to be damaged or not connected. I dont know what to do ive tried everything i know what to do , please HELPPP!!
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Sounds to me like your replacement digitizer is defective. I would check with RepairUniverse (or where ever else you got it from) and see if you can exchange it. If that doesnt do the trick the controller on the motherboard is probably bad and you will probably end up having to do a warranty exchange with verizon if you still can.

Touch does not work on small parts of the screen

All of a sudden few small parts of my screen stopped responding to touch. When typing texts or emails, letters "T" and "G" do not work in portrait mode and "E" doesnt work in landscape. I did some research and it seems to be digitizer or moisture problem. I did not expose the phone to any moisture before it happened... I tried to do hard reset to eliminate software issues. Do you think this will be covered under warranty?
MrSlacker said:
All of a sudden few small parts of my screen stopped responding to touch. When typing texts or emails, letters "T" and "G" do not work in portrait mode and "E" doesnt work in landscape. I did some research and it seems to be digitizer or moisture problem. I did not expose the phone to any moisture before it happened... I tried to do hard reset to eliminate software issues. Do you think this will be covered under warranty?
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if it's a digitizer issue, then yes it should be. if it's a moisture issue, then it's water damage and you'll be forced to fix it yourself.
you should be able to, I recently exchange mine and it had an unlock bootloader just go to an AT&T customer center (assuming you have warranty with them) they'll swap it right up. (Back up your files, contacts, etc. Cuz they are not gonna fix it but replace it)
I just got my phone replaced for the same reason.
If there's no water damage etc., definitely get AT&T/Motorola to replace your phone for you.
I think its starting to happen to alot of people... mine went out a few weeks ago... but I'm at school and haven't had alot of time to send it in... thankfully I have an older phone with me.
best chance is you have to replace the digitizer, i tried everything i can to fix my but nothing worked, so i had to replace the screen. Motorola should follow Nokia and did some testing before selling the phone

[Q] Digitizer

This is the 2nd digitizer I've broken on this phone. I took it off and replaced it. I put it back together and the digitizer did not work. I checked the connections and even took the digitizer off. I put the old, cracked but working, digitizer on and it no longer worked. I took the phone apart again and put the new digitizer on and it still did not work. Considering the old digitizer suddenly did not work, it must have been something I did to one of the boards or connectors on the phone. Also, the speaker no longer works. Any thoughts or suggestions on where I went wrong?
I can't guess what's the problem exactly but I can give you a few tips.
dissasmeble the phone according to the vidoes you can find on the web.
when you assemble it don't attach the digitizer to the screen yet. connect the digitizer first to the phone. then put the screen in place, with the digitizer still connected but not on the screen.
in this way you can test the phone before "closing" it.

Accelerometer and Proximity sensors not working

I broke my screen and replaced it and now my prox sensor and accelerometer stopped working.
I replaced the screen a couple weeks ago and the sensors were fine, but the LCD had dead spots so I ordered a new screen and put that one in and that's when the sensors stopped working. Would these sensors be affected by the screen if it was faulty? I also noticed that I scratched the Motherboard flex cable while disassembling it (I don't know if the scratch occurred during the first or second screen installation though, since I only noticed it during the second time around). Could this be the cause of the two sensors ceasing to work? The scratch is about half a cm long and is on the same side as the sim card.
Thanks
Hamburg said:
I broke my screen and replaced it and now my prox sensor and accelerometer stopped working.
I replaced the screen a couple weeks ago and the sensors were fine, but the LCD had dead spots so I ordered a new screen and put that one in and that's when the sensors stopped working. Would these sensors be affected by the screen if it was faulty? I also noticed that I scratched the Motherboard flex cable while disassembling it (I don't know if the scratch occurred during the first or second screen installation though, since I only noticed it during the second time around). Could this be the cause of the two sensors ceasing to work? The scratch is about half a cm long and is on the same side as the sim card.
Thanks
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it could be affecting the connection to these sensors from my experience of assembling / disassembling nokia 920.
boril said:
it could be affecting the connection to these sensors from my experience of assembling / disassembling nokia 920.
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Basically I'm trying to figure out which is the more likely cause. Im going to have to order a new part and I dont want to order the wrong one and waste my money. Any idea if the scratch on the flex cable or the screen would be the most likely cause? Thanks.
Hamburg said:
Basically I'm trying to figure out which is the more likely cause. Im going to have to order a new part and I dont want to order the wrong one and waste my money. Any idea if the scratch on the flex cable or the screen would be the most likely cause? Thanks.
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flex cable scratch can cause this, but so far i don't know how to change it - order replacement flex cable and then found out that it is glued / soldered to the board somehow.
I found there is 3M™ Electrically Conductive Adhesive Transfer Tape, which can be the solution for this.
Is that problem resolved?
I have a same issue.
I had the same issue. To fix it I had to do a factory reset without the SIM inside.

Line on keyboard off calibration after screen replacement.

I just got done replacing my broken screen on my LG G3. I replaced the whole front panel and just transfered the guts. Everything checked out fine after replacement until i typed my first text message. row A-L will not goto screen unless I touch nearly inbetween the middle of the row beneath it. q-p work fine as well as z-m. What really has me boggled is that the screen accepts touches there in virtually every other app/drawing. Just the keyboards aren't allowing touch in that specfic row. any suggestion?
Found a few more bad section.. Pulled the back loudspeaker back out and tried reseating the cables and still had same issue. They're sending a replacement for free.
This was my first screen replacement, but not my first time dealing with small ribbon cables. All cameras function fine, hoping it was a defect in screen and not my screen changing abilities.. Any tips for the next one would be appreciated. Would like to have a fully functioning phone again sometime. This is nearly more frustrating than the broken screen.
I am having same Issue
steber04 said:
Found a few more bad section.. Pulled the back loudspeaker back out and tried reseating the cables and still had same issue. They're sending a replacement for free.
This was my first screen replacement, but not my first time dealing with small ribbon cables. All cameras function fine, hoping it was a defect in screen and not my screen changing abilities.. Any tips for the next one would be appreciated. Would like to have a fully functioning phone again sometime. This is nearly more frustrating than the broken screen.
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Hey just curious if your issue has been resolved.... I am having same issue, but i took mine to a computer store i have been dealing with for years. about a year ago they started doing cell phone repairs as well. I had them replace my cracked screen on my LG G3 and that same row of text if off for me and there are a few other spots i have noticed are off as well .... very frustrating... Anyway the place I took it to has replaced 3 screens hoping they were getting defective parts.... they just called to tell me I can come get it but they were unable to repair the dead spots without going further into replacing boards or something.... I dont know... It is weird though cause you can get the dead spots to work sometimes by very lightly touching or just touching it in just the right spots like a calibration if off....
thomas020476 said:
Hey just curious if your issue has been resolved.... I am having same issue, but i took mine to a computer store i have been dealing with for years. about a year ago they started doing cell phone repairs as well. I had them replace my cracked screen on my LG G3 and that same row of text if off for me and there are a few other spots i have noticed are off as well .... very frustrating... Anyway the place I took it to has replaced 3 screens hoping they were getting defective parts.... they just called to tell me I can come get it but they were unable to repair the dead spots without going further into replacing boards or something.... I dont know... It is weird though cause you can get the dead spots to work sometimes by very lightly touching or just touching it in just the right spots like a calibration if off....
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A review on G3 LCD's on Amazon reports the same problem "I installed the screen and immediately my wife mentioned that it seemed to have "dead spots" when she was texting / playing games. I noticed it myself when I tried texting myself as a test. Several of the letters on the keyboard just wouldn't register very well. She went into the settings and ran the "motion sensor calibration" test under general settings>gestures. This has resolved the touch screen issues. "
I don't see how that would fix it but I guess it's worth a shot.

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