Develop Bugs

Replaced desire AMOLED screen - Still blank

After dropping my desire the screen had an obvious crack (no crack in the glass/digitiser) and displayed crazy colours from the crack, spreading across the screen over the course of the day until finally going completely blank.
Bought a new screen on ebay, same part number, same samsung AMOLED. Replaced today and the phone exhibits exactly the same behaviour. Switches on, digitiser works to the extent I can unlock and lock the phone, but screen is constant black. After a few switch on/offs the screen showed two green lines at the top and about half way down upon unlocking, that went away after another lock and unlock.
Pretty confident that the disassemble/assemble went ok and I didnt stress any flex connectors or similar... so have no idea what could still be wrong....
As I say, phone boots and can unlock/lock (makes the right noises etc) and is recognised by computer when plugged in.
Could using the phone until the screen completely stopped working have broken the controller or something?
Any input greatly appreciated.....
EDIT:
Just switched it on again, green line at top from keyboard lighting point, then the whole screen went blue on unlock. :S
This sound like a dying something, or maybe just bad contacts? Find it strange that unlocking has an effect....

Might be a bad connection or little shortcut?
Here is an official video on how to assemble and disassemble the device, http://forum.xda-developers.com/showthread.php?t=768535. Don't know if that helps but you can check if you did something wrong in the progress.

"..Bought a new screen on ebay.." Do not buy Chinese, buy the original.

ronijs19 said:
"..Bought a new screen on ebay.." Do not buy Chinese, buy the original.
Click to expand...
Click to collapse
Seeing as the part was shipped from my country and had the exact same markings and serial numbers as the part I removed, I dont think this is the issue.
Thanks for the video, will disassemble and clean all contacts later today.
Was mainly posting to see if people had heard of/experienced the same issue, trying to ascertain whether it could be a faulty replacement or if its possible to break the hardware that runs the screen.

A good fake can be hard to tell apart from an OEM part...

So the consensus is that its a fake replacement? Really? The screen seems identical in all markings and connectors, my only conclusion can be it came from the same factory. What market would there be in producing defective replicas of mobile phone components?
Anyway I have sent the screen back to the seller for a replacement.
Any response to my other questions? Is it possible to damage the hardware that drives the screen by using the phone with a dying screen to the point of blank display?
Reading through another thread: http://forum.xda-developers.com/showthread.php?t=933866
Post #6 suggests the rom on the phone could have an effect, is this the case?
Thanks for any input.

Rom couldn't be the issue if you've installed the exact same screen.
My guess would be a loose connector.
Sent from my HTC Desire using XDA Premium App

My desire lives!
Replacement screen worked just fine....
Thanks for everyones responses!

Can you post the link to the seller on ebay, from whom you bought the display?

[Q] HW0002 Touchscreen Problems.

Recently my EVO has stopped responding to touch inputs. It will wake with the power button but sometimes the touchscreen will not respond. Sometime I'll be able to launch an application and then it will stop. Sometimes it will work fine for minutes/hours and then the problem will surface. I've tried multiple ROMs and it doesn't seem to matter what software (AOSP or Sense) the phone is running.
Any ideas?

Sounds like it may be a hardware problem and not a software one. Have you had any problems with the LCD or digitizer?

Tripp-phpBB said:
Sounds like it may be a hardware problem and not a software one. Have you had any problems with the LCD or digitizer?
Click to expand...
Click to collapse
well if its not responding then it is the digitizer. but before you dump a bunch of money into a new digitizer or new phone let me ask u this.
does it only not work while plugged in and charging? because that is kinda a common problem. as long as it works when not plugged in then ur fine.

I haven't specifically tested it to see whether or not being plugged in affects the problem but another symptom is that when it goes on the fritz you can be hitting the back or home area at the bottom and it will register the touch somewhere near the top of the screen.
Does that narrow the possibilities?

Definitely sounds like a screen/digitizer issue.
If you have the protection plan from Sprint, you can take to a repair center and they will replace for you. No charge.

Thanks for the help. My local Sprint store will replace it for $35. So we'll see if that's the issue.
Gotta flash over to stock ROM so they'll work on it though.
EDIT:
Spoke to soon. Technician at the Sprint store won't work on it. They're trying to claim there is water damage when there is none. I guess I'll have to do it myself.

Black screen after display unit replacement

Hi,
My HOX touchscreen was broken, the touch and everything was still working. I ordered a replacement lcd display Unit and replaced the complete display and touch. After replacement the screen is completely black but the phone still works. The touch buttons on the bottom still work and i can use the volume buttons. I replaced the lcd display unit very carefully and i am sure nothing is broken etc. So the touch is working but the screen is black. I tried 2 display units and both show me a black screen.
Does anyone know how to solve this problem? Did i forget to do something during the replacement?
Please, i need some help with this issue.

I`ve got the same problem. Have you found a solution?

XtR3m3R said:
I`ve got the same problem. Have you found a solution?
Click to expand...
Click to collapse
Yes, it seems that the display units from HOX are not all the same. You have to check with display flex you have and compare it with the one you have new. I tried an other display unit and it worked for me.
Now i have the same problem for my friends HTC One X. Were looking now for the right display unit..

Sam1991 said:
Yes, it seems that the display units from HOX are not all the same. You have to check with display flex you have and compare it with the one you have new. I tried an other display unit and it worked for me.
Now i have the same problem for my friends HTC One X. Were looking now for the right display unit..
Click to expand...
Click to collapse
I got both types of screen and none worked
help :crying:

Sam1991 said:
Hi,
My HOX touchscreen was broken, the touch and everything was still working. I ordered a replacement lcd display Unit and replaced the complete display and touch. After replacement the screen is completely black but the phone still works. The touch buttons on the bottom still work and i can use the volume buttons. I replaced the lcd display unit very carefully and i am sure nothing is broken etc. So the touch is working but the screen is black. I tried 2 display units and both show me a black screen.
Does anyone know how to solve this problem? Did i forget to do something during the replacement?
Please, i need some help with this issue.
Click to expand...
Click to collapse
Ive swapped a few screens over on the one x and x+, I find the screens don't show anything until the phone is soft reset by holding down the power and volume up button for around 10 seconds (until the lights flash several times and then the phone vibrates before booting).
I have also found that the motherboards do accept displays manufactured by different companies (sharp, sony, AUO.. etc) the soft reset is a required step. If an identical lcd is used there is no need to reset.
Hope this helps!

Weird touch screen.

Its been some days, I'm experiencing this weird touch screen problem.
My DZ touch screen doesn't respond properly.
For example:
If i see an image and slide just one finger up and down then it would zoom in and out. And then the whole screen becomes unresponsive.
It seems as if, its touched by itself. Even the softkeys would go numb. Only the haptic feedback of my search button works at that moment.
But the trackpad works perfectly.
But, If i lock and unlock the screen using power buttons, it would work properly for some few moment and then again the problem repeats.
At present I'm repeating this process of locking and unlocking screen to use my phone.
One even worst weird thing is that, if the device is connected to a charger and kept on the table or floor. This problem doesn't occur.
I have done system format, restored my nandroids and even changed Roms. The problem still exists.
Please note, i don't use any Casing or covers that would press the device hard for malfunctioning of screen. I have even removed and replaced my screen guard.
I'm sure, its not a software issue.
And even i dont think its a strip issue, because i dont use my physical keyboard always.
Can anyone say what hardware issue it might be..?
Or what i need to do? I'm really out of options.
Do i have to replace my whole screen or the digitizer..?
Thanks...

Thats no fun,
As you stated it's more than likely a hardware fault, the two most likely culprits would be the digitizer or the main flex cable
Which would be this and this
both relatively easy to replace depending on your experience
in 4.x and up ROMs check the developers setting to show touch or use apps like
z device test
or
yet another multitouch test
these wont help you fix the issue but may show you where the bad points are on the screen
best of luck

I know the problematic spot. Its near Search softkey. Even Yet another multi-touch test would stuck at that spot....
As you can see in the image, that i'm not holding anywhere, still it shows that somewhere around Search softkey its touched by itself.
In second image, If i move my fingers around, it would show the other touch responds, but if i slide near search, it would go and stuck there itself.
So, i guess i would first go with the flex cable.

In actuality I'm leaning toward the digitizer in your case, but its possible to be either.
And if you have a spare phone it may be worth disassembling even without buying anything. On a G1 I once fixed a similar issue just taking out the digitizer and cleaning the contacts on the ribbon and the edges of it as well, when I put it back it worked like new. I think some dust may have gotten into the edges but it may be worth a shot before buying anything... But could make matters worse so if you don't have a spare, buy parts first
Best of luck
Sent from my Nexus 7 using XDA Premium 4 mobile app

I guess i should try disassembling and clean it first. If it still persists then i would go for digitizer.
And thanks for giving a hope.
Thanks...

[Q] Screen Replacement Issue. Advice needed please

Hi there,
I have my friends HTC 8S which needed a screen replacement. Which I volunteered to fix as I have previously successfully replaced the screen on my old HTC One X. However, after following all the steps that I researched, an issue arose where I would part assemble the phone (all cables on the motherboard connected, battery connected) to check if the screen would work and there was nothing, I tried a soft reset to see if that would work, which it didn't. I assembled the phone fully to see if it was maybe a loose connection so if I button it all up tight then the connection will be made but that failed also, I even tried the old screen again, that wouldn't work either! So a faulty screen & digitiser is out of the question.
I was very careful when replacing the screen & to my knowledge I have broken nothing. The phone does receive calls, the buttons do work including the light sensors for the home screen etc.
So I'm pretty stuck & feeling bad as my friend is without a phone. So any help or advice will be welcome
Thanks