[Q] Nexus 7 will not boot after new digitizer - Nexus 7 Q&A, Help & Troubleshooting

Hi all,
I sucessfully changed my cracked digitizer on my Nexus 7 gen 1. Followed the procedure in youtube and heated my screens and used guitar wire to remove the cracked digitizer-looked good.. Cleaned up the glue on the LCD and and taped the LCD to the digitizer. I did not glue the LCD to the digitizer. Reasembled everything and booted.
I booted and everything booted correctly. Except for starting. I had to drag the lock icon over to the right to open the tablet. Swiping did not work.
The digitizer does not work with swipes. I had to touch several times to even get a response. I could touch a icon app to start it but could not turn pages if I needed to. I thought the digitizer electronics was defective, so I bought a used motherboard(suposely 100% tested).
When the new motherboard came, I rassembled everything.
I powered up the new motherboard. Half of the screen had sigguily lines and I could see the boot up icons coming up on the other half. Thinking I did something wrong, I pulled the battery connector. Rechecked all of the connections, and pushed the start button. Nothing happened. No light of any kind.
I reinstalled my original motherboard and same thing, no boot up at all. The only difference is that with my original motherboard, I heard a "bonk" sound from the speaker 3 seconds after I push the start button, but nothing on the screen.
Any suggestions from anybody? Maybe bad LCD connector. If the connector is bad, would that prevent booting?
Anybody seen this before?
Help!!!!!!
Steve

Leave it charging for half hour and press power button for 10 to 15 seconds and it will boot

Hi all,
I think I found the answer already.
My LCD flat cable is broken. Using a ohmmeter, I found most of the flat gold traces have a break in them. Probably from my dis-assembly of the
and assembly of the LCD too many times. i am ordering two LCD cables from a China distributor.
I hope it fixes the problem, I have not received the cables yet.
But the question remains. Does having a bad LCD cable prevent or stop the Nexus 7 from booting?
Steve

Related

X1 Ribbon cable - what happens and a fix I came up with!

Hi, I come on here quite a lot for information as it's an amazing resource! This time however, I'm attempting to give something back!
I experienced the "black screen on slide out" on Monday. Phone completely screwed. I've also had a few droppages and had it apart once before so there's no way warranty is gonna help!
I stripped it down and soon discovered what it is that actually fails on the ribbon. The coating had worn through due to rubbing on something during the slide out / in process. it had been playing up for a while, probably due to shorting out on the metal case, but now the tracks (aluminium?) had worn right down.....
In pic 1 i've circled the worn area. The shiny section is where i'd tried taping over it to prevent shorting, before i realised the tracks were gone.
Got an almost new one off ebay for 15 quid and, realising it was going to happen again, came up with a solution that, so far, looks like it will work....
A while back I bought some "anti rattle felt" for my car's dashboard - really thin and strong self adhesive felt to prevent squeaking joins between dash sections. I cut a piece of this and stuck it to the new ribbon. Once this stuff is on it's well stuck, by the way!
See pic 2 for the modded ribbon cable.
On reassembly everything is working just fine so far! Here's hoping that it lasts longer than 6 months this time!
Just need a new casing now as mine is decidedly second hand!
Hope this turns out to be of use to someone!
cool story bro
when i took apart my xperia to replace the housing this seemed like a really weak point in the device. glad to see someone who has had the problem has been able to fix it
Why does the screen go black?
Hi,
When the coating wears off the ribbon cable it exposes the tracks in it. when you slide the keyboard out the exposed tracks short out on the metal casing and the screen loses it's input signal.
thats whats happened on mine at least and i presume quite a few others?
HTH!
Update:
That's interesting: My phone was also losing signal with the keyboard out, and occasionally while closed up as well. It would just randomly drop to "no signal" for a few seconds.
It hasn't done it since replacing the ribbon cable.....could be coincidental of course.
I'm having the same problem
It just started a week ago and I got the phone in January off of ebay. I'm new to opening up the phone so could anyone help me find the correct tools or have a link to a site with pictured instructions?
I noticed that the sliding mechanism started to go loose about 4-5 months ago but didn't expect the screen not respond in landscape mode. I have yet to see the other symptoms you all are referring to. I would like to fix this before it get worse.
In mine case it went totaly black after one week of this problem... You have all the instruction on youtube, there is where i looked. For tools you can be inovative, but the exactly right ones come with housings from ebay, it is only 15EUR, and i bet you have some cracks so it wouldn't hurt replacing. That is what i did, along with ordering new sliding mechanizm, and new ribbon cable.
I am open for ideas to prevent my ribbon cable from being cut at it weakest point again.
I'm assuming my flex ribbon went bad yesterday, since sliding the keypad out causes my screen to shut off.
Already ordered a cable off ebay and will attempt to replace it myself :O
Replaced my flex ribbon cable with one I bought on eBay. The screen doesn't turn on at all now, which leads me to believe the cable I was sent is defective. Put the old one back in and it works okay, less landscape mode. ughhh what a pain.
great tips! my input is I bought a case off of ebay that was ~60$ and everything actually fit fine for me...so I wouldn't discount every seller but you do get what you pay for, the 15$ cases are probablly the ones that will give you problems
I working in a mobilephone repair center if anyone need help drop me a priv... i able to get 2nd hand or even brand new components
Replaced the flex ribbon cable -
I got my flex ribbon cable a few weeks ago and took it to my local repair shop. They replaced it but the LCD screen/optical joystick receives no power. The touchscreen and everything else on the phone works just fine now. I thought it was a defective item so it was exchanged with a new one.
Got the repair shop to replace it again and the outcome still remains the same as the first.
Theres no light coming from the screen nor the side illumination.
I just told the repair shop to just place the original back in for the mean time.
Before the repairs, there would be a flicker of white light and random illuminations. Now there's no lights at all except the power botton.
Could it be defective a batch that the seller was sending out? or the repair shop's mistake and is playing dumb so they do not have to admint fault?
Hopefully there's an easy fix to this problem.
-Also I did inspect the ribbon before and after the repair. looks new as the OEm
Can anybody help me out with this new problem after replacing the cable -
perhaps you should try a hard reset. Ive had problems in the past where the optical joystick and the illuminators did not work, and that worked for me.
On the other hand, the top illuminators are on the same piece of hardware as the flex cable that was replaced, so a faulty flex cable is possible. The bottom illuminators are on the circuit board that the optical joystick attaches to, separate but connected to the flex cable.
Ive recently replaced my flex cable and touchscreen. The experience i had with the faulty touch screen was that it appeared to receive no power, but was in fact displaying a dark backlit illumination that could only be seen in the dark. At the same time however, the screen did not display anything. I'm not sure if this is similar to your experience, but if so then your touchscreen would need to be replaced.
ive done all repairs on the xperia myself, and one thing ive discovered is if something doesnt work right after a repair, simply disassembling it and reassembling it to make sure all the connections are properly done has worked for me in the past.
"Before the repairs, there would be a flicker of white light and random illuminations. Now there's no lights at all except the power button."
Now when you say the power button, do you mean that a red light appears under it?
I dont know if i can come to a conclusion or that i can help (or have helped) you come to a conclusion, but i can only assure you that the xperia acts out in strange and weird ways.
Good Luck!
Tags
Dismantle / Disassemble Sony Ericson Xperia X1
http://www.ifixit.com/Teardown/Sony-Ericsson-XPERIA-X1/788/1
http://www.formymobile.co.uk/xperiadisassembly.php
http://www.youtube.com/watch?v=AWDurQrRt-Y (REAR)
http://www.youtube.com/watch?v=iyGUbxFqvyc&feature=related (FRONT)
http://www.youtube.com/watch?v=elgC8hwHfYQ&feature=related
For info.
Mike
Thanks for the links. I've tried the hardreset and restoring the original rom but the issue is still there. It's really bugging me that everything works but the LCD screen. I'm currently using MyMobiler to use my phone. The touch screen works fine and so does the soft keys. Just no power for the lights. I might just give up and wait for another phone that catches my eye and then tinker with the xperia myself. but if anyone got a solution or want me to test something then I'll give it a try.
My warranty is no longer affective so I'll use my phone as a tester to help others with any problems.
TRIONDAVE, how's your Xperia running now with the cable mod that you did? Its been 6 months since you created the thread. I hope you're still around.
My Xperia X1 works nearly fine, except for the keyboard issues, so I'm thinking of opening it up. If your Ribbon mod helped I might just do it too once I've got it opened. Mine has a MOUNTain of cracks though, and the battery compartment itself is cracked on both side enough to make the compartment CURVED. Hence the Battery cover doesn't sit well.
I'm looking around for broken Xperias which I might be able to use to change the internal cracked casing. Lets see.
DatDereX1 said:
cool story bro
Click to expand...
Click to collapse
My thoughts exactly.
Hello guys, I am in need of real help over here!
Its just that Ive replaced my ribbon cable, the old one got screwd up.
However I got done for 10 minutes ago, tried to start up the phone.. without success :,(
The ribbon cable doesnt have anything to do with the start up, only the screen am I correct? Cause I cannot even start my phone..
Ive connected the charger, but when I remove the battery it shows a red light, meaning no battery, correct?
So what may the problem be exactly? Maybe the battery is all dead, or?
PLEASE HELP!
for the people with ribbon failures how long have you had the phone before it occurred ? im just interested on the cables lifespan.
mine is fine so far but i have noticed the slider is flimsy and rocks left and right.

[Q] No display after replacing the digitizer

Hi all,
My screen digitizer was in a bad shape, so after doing some research I ordered one off ebay and got it today. I used the guide on http://www.pdacenter.ru/razborka/htc_tattoo/ to disassemble my phone, managed to successfully replace the digitizer and put everything back again. But whenever I turn the device on now, the only thing I get is the backlight of the LCD and nothing else, no boot animation etc and it hangs like that forever. What could cause the problem? I'm really desperately in need of help. I checked the connections of the LCD more than one time and they look in place.
Thanks a lot in advance.
If you have getting only backlight, this means that you have properly connected ONLY power source of your LCD. Pins for video input are not properly connected. Call from another number yours after 3-5min and if phone rings problem is only in LCD. Try to clean pins with Ethanol 96% and dry it with a dry cloth. Then put all back and check. This sounds stupid but it helps, clean pins with !eraser for paper! people do that with pins on PCI cards.
Good luck, if you fail go to service they will do that for 5 min and 5$.

[Q] No picture on screen after replacing digitizer?

After I replaced the crashed screen glass and digitizer on my sisters HD2 it doesn't work properly. The phone starts only if it's connected to a power source and when it starts the screen backlight is turned on but no picture appears.
I've replaced the screen glass once before on my HTC TytnII and then everything went fine but now something got wrong. Does someone know what it might be?
I've tried to disassemble it and assemble it again but it's no difference.
Get the LCD and digitizer together and then assemble with the HD2.
Looks like the 2 are not correctly stuck together and this is a cumbersome process requiring the use of an oven.
So the two must stick together to display any picture? It sounds strange to me but I've used some glue that I bought on the same place I bought the digitizer so it should be ok.
Check the LCD clip on the main board, as well as the flex cable. If both are fine, your LCD is dead and needs to be replaced. The digitizer does not need to be taped or glued onto the LCD for it to work. When reattaching the LCD, be EXTRA careful of the clip, thats the first part any of my techs damage when they first work on this phone.
Sent from my HD2 using xda premium

Touch screen unresponsive -> Inserted new LCD+digitizer -> touch screen unresponsive

Touch screen unresponsive -> Inserted new LCD+digitizer -> touch screen unresponsive
My friend's Galaxy S4 i9505 had a crack in the glass and he asked me if I could fix it, so I carefully separated the glass from the LCD and glued a new glass on it using Loca UV glue. At first glance the result was absolutely great, but when I powerd on the phone again, the touchscreen suddenly was unresponsive. After re-checking al connections over again and resetting the phone back to factory defaults, the touchscreen was still unresponsive.
We decided to order a new LCD + digitizer unit from a Chinese Ebay seller with 99% positive feedback. After about a week and a half it arrived and I moved over parts on to the new screen and installed it very carefully. After checking all connectios and booting up the phone I unfortunatly noted that the touchscreen was still not functioning.
Now I really don't know what to do anymore, since the new LCD's touchscreen (digitizer) can actually be a D.O.A. what I would find bad coincedence or there is some sort of problem with the phone's mainboard wich would be bad luck.
What do you guys think? I am really not sure now. I will probably contact the seller of the LCD and try if I can return it and he will send me a new unit (No money back guarantee :crying: )
Maybe there are some other options left? Any ideas, please?
EDIT: Problem solved. Repairguy discovered that a small chip on the mainbord was damaged. He replaced the chip and now the phone works like a charm.
I had a similar problem after replacing my entire front assembly housing (preassembled glass, digitizer, LCD, frame). After I got everything transferred over from the old one (vibration motor, front camera, earpiece, headphone, motherboard, antenna micro-coax cable, lower bezel control ribbon), hooked everything up, screwed rear housing back on, reinserted SIM card & SD card, reattached back battery cover, powered it back on-- then to my horror, there was ZERO touch input response on the touchscreen. Panicking for a few minutes, started planning on moving everything back to an old Android (S3) phone, then thought to try a reset first-- I pressed the up volume & power buttons, got into recovery mode, then selected "wipe cache partition", then selected "reboot". After it restarted (and holding my breath), VOILA it worked! Touch input was restored, Hallelujah!
Just commenting here so I remember where this thread is.....lol
I'm going to be replacing the screen on my son's S4 when he's saved up enough money to buy the replacement screen......
Does anybody know if (in general) ebay purchased screens are reliable?......
http://i.imgur.com/rVnFwJM.jpg

D800 Replacement Display Doesn't Turn On

This is my first attempt at a hardware repair. I ordered a replacement display with frame for my d800 that broke 5 yrs ago. I was not aware of a method to bench test the new display before reassembling the device until afterwards so it was not tested before hand by myself.
I feel like I reassembled the phone decently, but the display wont power on just a black screen. The device does boot as it seems to go into android since I get system and volume sounds.
<deleted paragraphs>
Edit: I got the display to work. One of the ribbon cables wasn't seated completely. My first successful repair. Yay!!!

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