I've just replaced the screen and digitiser in my wife's (original) Nexus 7. The new screen works but the digitiser is somewhat erratic - it mostly works when held in the hand, but becomes fairly unsensitive when placed on a table.
At first I thought it was a dodgy connection and holding it would put pressure on the ZIF connector on the motherboard for the digitiser. But I've discovered that if I place it on a thin table mat it is erratic, but putting my hand under the mat (so not changing the pressure on the back of the tablet) causes it to be more reliable, so I'm guessing its being affected by rf-coupling with the "holding" hand.
Anyway, I'm wondering if there's any way to recalibrate the sensitivity of the screen to see if upping the sensitivity will help?
Many thanks.
Related
Hi..
I bought a Vodafone V1605 ( HTC Tytn ) from ebay... the auction description indicated some alignment problems that could be resolved by screen re-alignment...
But when i got the package i found that the problem is worse than that... as you can see in the picture ( http://img81.imageshack.us/img81/4319/tytnscreenul8.jpg ) the top-right of the screen seems to be with problems.... I tries to draw several horizontal lines... and in the top-right part of the screen i got some waves...
I'm thinking about returning the phone... but can this be resolved by purchasing a new touch-screen ? I've seen that buying a replacing touch-screen is not very expensive....
Best regards,
A new touch screen might help. What also is a known issue is the screws at the back of the screen. Try to tighten these it helped for some guys allready.
I replaced my touch screen after i cracked it and now i can't get it to align at all.
I click anywhere on the screen and it thinks it's a click in the top left of the screen as the start menu opens up.
Haven't been able to find anyone to answer my posts for help either.
If there is dirt on the edges of the screen (between screen and cover) it can cause alignment problems as well. I had to recalibrate mine several times a day at some point as dirt would move and press different locations, biasing the digitizer. I got tired of it, dismantled the phone, took the LCD out, cleaned it as well as the inside of the case, and put it back together. No more issues so far.
kilrah said:
If there is dirt on the edges of the screen (between screen and cover) it can cause alignment problems as well. I had to recalibrate mine several times a day at some point as dirt would move and press different locations, biasing the digitizer. I got tired of it, dismantled the phone, took the LCD out, cleaned it as well as the inside of the case, and put it back together. No more issues so far.
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Had exactly the same problem (and solution) for the screen alignment problem of my Xperia X1. I removed a tiny plastic piece (most likely a leftover from production process) which stuck between the metal frame and the touch screen. After that I could easily align the touch screen and have no alignment problems anymore.
Be careful to not break the screen - I used a thin sewing needle and tweezers to remove the plastic piece.
This is my first phone with a capacitive screen, so perhaps it is a quirk of them, but I have noticed that if I am not holding the phone in such a way that I am touching the metal bezel, the screen does not recognise touches that are close to the edges of the screen. It seems that the screen requires a circuit to be made with other metal parts on the phone before recognising the touch.
For example, if I put the phone on my desk and touch the backspace key with a single finger, nothing happens. If I keep holding my finger on it, and touch the metal bezel, hey presto, the button clicks.
This reminds me of a watch a friend of mine had a long time ago, that had a capacitive "hair trigger" button that only worked for him (because it required a circuit to be made with the back face of the watch, meaning when he pressed the button it completed a circuit through his body)
Anyone else noticed this? It is slightly annoying because I have to hold the bezel when I want to use the phone..
Confirmed.
And you might very well be correct in the assumption about the circuit not closing in every part of the screen. I think it's the nature of any capacitive surface tbh. If you press in the middle of the screen then there is enough adjecent space to actually complete the circuit while on the edges there is simply not enough space around your fingertip to not close the circuit at all. That is why touching the bezel works.
But as I have been holding my little Hero in my hand while typing anything I simply didn't know this little odd thing. I have read about it though.
Yet another reason to hold your precious little Hero in your hand...
Wierd not like that on my samsung.. its all plastic tho
Mine is the same.. especially on the right hand side of the screen. If it's in a case it makes it really bad!!
Sounds like bad shileding and grounding to me
Didn't notice this until I put a screen protector on but now it's really bugging me.
On a related note (metal bezel related), I've noticed that in dim lighting the button backlight flickers. But if i touch the screen and bezel, it stops.
herman3101 said:
Didn't notice this until I put a screen protector on but now it's really bugging me.
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Same here. Could it be that the screen protector slightly touches the aluminium casing and thus grounding the screen (or creating a wrong potential)?
I noticed that when i touch (=ground) the outer aluminum frame with just one single finger then the touch screen works flawlessly.
(I'm using the offical HTC screen protector).
joemax said:
On a related note (metal bezel related), I've noticed that in dim lighting the button backlight flickers. But if i touch the screen and bezel, it stops.
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Hmm definatly bad grounding issue. Its either some pretty poor design or a defect.
i confrim, using hero without touch the metal edge result in less responsivity and difficult on multitouch operation
hope new firmware can solve this, too many errors using it like a normal keyboard on a table!
Hey im panicing so bad rite now. I just broke my htc's LCD screen ! Mad sad from this disaster . Dont got much money so can someone please tell me whats the cheapest or best way to replace or fix it ? I really need help because im freaking out!
The repair choices
There are basically two choices. Doing it yourself or having it repaired.
In either case the most straight forward is to replace the screen and digitizer as one unit. I expect you can still see things on the screen yet its cracked from one corner. Its the digitizer on the top that usually suffers but its hard to replace by itself. There is a YouTube video showing how to do this (search on Replace Touch Screen on HTC HD2 on YouTube).
If you are game to do it yourself (an electronics tech would be able to do it fairly well, though it is still fairly difficult) then you can buy a complete screen and digitizer off ebay (around $100). Getting the unit out of the case is tricky as its held in with 4xT5 Torx screws (easy bit) and lock notches around the case (tricky part). I found thin stiff plastic bits slotted in between the module and the case works well at releasing the locking notches. Then press out at the top of the battery area, while pulling the top edge of the plastic case out and down with your finger nails. One side at a time. Don't forget to remove the SIM card and SD card as these will hold the module in place if not removed.
The double sided tapes used to hold the screen in place are a problem, but warming them up with a carefully applied heat gun does release them. I would add that there is no need to unscrew any of the electronics boards as the screen can be replaced without doing this. Releasing the screen ribbon cable connector is done by flipping up the black locking section on the ribbon socket. Slide in the new cable, lock it down, then curl it around as you slide it backward under the metal case so that the curl in the cable occurs in that small space under the metal rather than being folded over sharply, which can fracture the ribbon cable "wires" rendering the screen dead.
Press the screen back down onto the tape (hopefully the tape has remained slick enough as its all that holds the screen in place). Be careful to align the edges and top and bottom correctly, otherwise your buttons won't work and the screen will not sit in the case properly. You can test the buttons as you align to feel for the slight click. Be sure to test all four as alignment left to right is just as critical for full function as up and down. You should also watch to be sure the light sensor little plastic bit (its a small clear cube of plastic) doesn't fall out and disappear while you are doing the screen swap and it stays in place during reassembly.
Then press it home into the plastic case. I remove the volume button (if it hasn't fallen out already) as it tends to push the volume button pads out of alignment (they are only held in with yellow tape (be careful not to loose them). Then with it all snapped in place pull out at the volume button section and slot the button back in place. Orientation is fairly obvious with the button points lower down and the joining bar going behind the case plastic to lock it in place (all with the screen facing upward). You may find the volume button only works if you press down on the screen slightly. This movement will be taken up when you screw the 4 torx screws back in.
Finish by powering up (with fingers crossed) and test. Hopefully all working.
Alternatively, if thats put you off doing it yourself, get it repaired by a service agent (around $300). Then it comes back all done with a small warranty. Most of the phone providers will be able to direct you to a good independent service agent.
I recently broke my 1 month old S5 LCD. Outer screen is just fine, but the LCD has paper thin glass, and it unfortunately met it's demise after a misplaced toss. I ordered a new LCD digitizer assembly and screen adhesive, then disassembled my broken phone. When I disassembled it there was either adhesive, or gasket material that was on top of the plastic flaps that go around the back and recent buttons (I assume adhesive), and also around the home button which I assume is important for functionality, and for water resistance. To make a long story short I assumed that this material would be provided with the screen adhesive so I removed the material from the back and recent buttons (it was already slightly damaged on one, and almost all peeled off of the other. I left the home button material because it seemed weak and I didn't want to break it. Also, some of this material had been peeled off/torn off surrounding the home button. After reassembling without the adhesive/gasket in these areas my phone now presses back or recent at random and it makes the phone almost impossible to use because it will exit out of programs or just start doing crazy stuff all on it's own.
My question is, is there somewhere that sells the adhesive/gasket for these three locations, if so where, and if not are there any suggestions of an alternative to the stock material. I am wondering if anyone has had some experience with this issue could chime it. I greatly appreciate any help.
Sincerely,
Dustin
So my digitizer/LCD has developed an intermittent dead row about 1/3" tall, if I apply pressure as I touch it then it works. Sometimes it just works normally. So this got me thinking, since there is a grid of capacitive lines that basically just conduct with pressure, and that these traces go off the edge of the LCD to join together in some sort of microcontroller, there might be a small circuit trace on the edge of the screen that could be fixed with heat and pressure. Has anyone tried this?
My plan is to remove the LCD and frame, then remove the battery. I will then get it very hot with a heat gun then place a stack of books on the screen to clamp the traces into position.
I have problem only part of the screen, pressing does not come back to work. I believe that there is no hardware problem, just software ... but I do not know how to solve .... I wish I could help you!