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
Related
Hi
I have a Qtek 9000 and recently I broked the display. As I had the service manual I thought I coud replace the display by myself. I bought a new LCD + touch screen on ebay and the replacing of the LCD was easy and went quite well. The lcd works fine but the touch screen don't. I cheked and clean all the contacts but couldn't make the touch screen work.
So I wrote de seller and we agree to send back de display and receive a new one that he will test bofore posting.
I placed this new display and the problem remais the same. The lcd works fine but the touch screen don't, so I think the problem could not be here.
I made a hard reset and even downgraded to the original ROM but the touch screen still not working.
Can anyone help me with this
Thanks
Have you tried the touchscreen side of things before re-asembling the casing?
I have had problems with the seal on the casing around the screen activating the touch screen permanently - so that it runs really slow (if at all) when using the keypad.
damn, did you get the touch screen to work at all?
which LCD + touch did you buy from ebay? hopefully we can avoid this seller and get something that works.
ever thought of buying the touch screen separately and putting that on?
Let us know how it goes.
whitemoo.
after disasembling/asembling device had the same ussie with touch,after a cup of hours using it.
armandoramos try to open,when UNI works,only a part of UNI with LCD(look page 21 in service manual-bottom picture,page 22 & page 23-middle picture),then try how works your touch.If it works-you just had pinch the LCD coaxial cable module.
i had a problem with my touch screen, i was lucky enough to find a second hand uni in a local market with a busted lcd but working TS.
i swopped over the TS and re-assembled my uni, one thing i did have to add was a tiny piece of foam between the ribbon cable assembly and the case, this was to push the two ribbon cable sections (TS and LCD) together, for a better connection, relying on the sticky bits alone was not enough.
hope this helps.
If anyone can offer any advise/assistance, it would be greatly appreciated!!
I have 2 AT&T branded 8525 phones. Both have issues and I assumed I could make one good working phone from them.
Phone 1 had a touchscreen issue. It is not responsive what-so-ever. I tried the credit card trick, cleaning out the edges, hard reset, soft reset, etc... nothing seems to make it respond at all. Reflashed the ROM, but of course I am stuck at the "Touch Screen to Begin" screen.
Phone 2 works just fine, but when plugging in the mini usb charger the screen starts to fade to white (with many vertical lines appearing...but eventually the screen goes to white). If you wiggle the charger, it will clear up, but then go back to the fading white screen. If you leave it long enough on the white screen, it will lock up.
So I thought I could take the known good LCD from phone 2 and put it in phone 1. Yesterday I took both phones apart to do this. I placed the good LCD in the phone that had the possibly bad LCD. Put it all back together and found the touchscreen still does not work . So perhaps the LCD was fine and it was something else. I then decided to just take the motherboard from phone 2 and put it in phone 1 along with the LCD I just replaced (effictively moving the lcd and motherboard over to a new case). Same issue... touchscreen does not work. I assume moving the parts around eliminates a loose connection of some sort. I did make sure the ribbon cables were properly aligned and secured well. I am guessing something is wrong on the motherboard.
Does anyone have an idea of what could be wrong to prevent the touchscreen from working?
Oh...moving both the motherboard and lcd with the whitescreen issue(phone 2) over to the other phone (phone 1) casing didn't change anything at all either...so I assume that is not a connection issue with the cables. I also looked closely at the mini USB connector on the motherboard to see if there was bad solder or something that was making it act up. I am guessing bad hardware in both phones, but was hoping I could somehow make one of these phones work and junk the other. Sounds like I may have to junk both as the cost of parts is probably is silly.
Thanks for any help!!
Eric
<warning>may be a long post</warning>
Ok, some history first...
I bought my Herald 1 year ago, and after 3 months of proud ownership i dropped it into the toilet. (was just changing to my swimsuit in case you are wondering)...
After that underwater experience, the only kink was that the End button stopped functioning.
Fast forward to the present day. After opening my phone with the help of the service manual i found out that the fault was with the flex cable (the cable that has the keypad buttons, and connects the screen to the phone board)
So i hopped on Ebay and ordered a new cable, along with a new housing as my old one was full of dents, and had the parts delivered today.
I opened my happy ol' Herald, removed the screen protector (this is an important bit, just stay with me) and changed the cable and housing, hoping to transform it to almost-new condition.
After doing the transplant, and hoping that everything went fine, i closed everything and booted the phone up.
The End key functionality was restored, but the Touch Screen STOPPED WORKING!!!. It was registering some very strange positions and as i lifted the pen the cursor was yanking to the right, so i tried the first obvious thing of Align Screen. Since that wasn't registering ANY positions, i reopened the phone, reseated all the cables and still nothing was happening.....
I was at the brim of despair, after 5 hours of screwing, testing, unscrewing etc... and was leaving work... and just as i was packing everything up i picked up the old dirty and worn Screen Protector and tacked it on the screen (and since it was on my office the whole time it got very very dirty).
And lo and behold, everything worked with the screen protector on!!!
So this is the story....
Now, i have a couple of questions:
1) Anyone has a logical explanation about this??
2) I'm afraid to remove the screen protector in case i lose the touch screen again, so now i have a brand-new looking phone with a screen that looks like it was run over. What do you think will happen if i remove it?? (maybe open a poll on this)
3) I also yanked the keyboard (after discovering that its held with Glue on the casing). Now i have it tucked in place but it's not glued. Anyone now what glue is safe to use to make it stick in place ??
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
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.
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Edit: I got the display to work. One of the ribbon cables wasn't seated completely. My first successful repair. Yay!!!