I recently changed the LCD screen on my HTC Desire G7 (A1818) as it was dropped. Apart from a white line on the screen the handset appeared to work fine. Now the phone won't recognise the charger (please connect charger!) and the touchscreen doesn't work. When using the USB cable HTC Sync recognises the phone and appears to communicate with it. On hard reset I get the error Touch screen: fail.
I have changed the touch screen but it hasn't made any difference.
I have a few questions:
- If the LCD screen is faulty can that stop the touchscreen from working?
- It looks like it could be the LCD board; is there anything anybody suggest to check this board?
- Could this be a software fault?
- Could the two fault be related?
Please help as it is driving me mad and costing me loads .
Related
Hello XDA ..
My G2 LCD stopped working for no reason .. It started flickering and losing colors two days ago .. and yesterday it went completely black .. I did not drop the phone or damage it anyhow ..
I opened it up and checked all connections and it looked fine .. the LED and digitizer screen work fine as well as the capacitive buttons at the bottom so I figured it is not a connection problem ..
I had Cyanegon on it for like 5 months and never had an issue .. I recently installed Virtious Sense ROM and I have been switching between the two the past week ..
My question is ,, do you think it is a software problem for example the lcd driver got messed ..?? or is it just the lcd was broken somehow
I am intending to buy a new lcd and replace the one I have now but I thought I should make sure that the one I currently have is actually broken before I replace it ..
Thank you,,
Edu
PS: if you can think of an easy way to check the functionality of the LCD let me know ..
Its rather hard for a software (even if it is firmware) to cause problems to an LCD. If you can se the backlight turning on but the screen not showing anything, i suggest you start trying out some unbricking methods.
Now, if the screen doesnt turn on AT ALL, then its possibly a hardware fault. The only way to be sure is to have an extra lcd available to connect to it. You could also try and give your lcd to someone with a Desire Z to try out your lcd on his phone and see what happens.
The "easiest" way though is to get a new one.
is the ribbon cable connecting the screen to keyboard damaged?
dumraden
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the backlight does not turn on at all .. so I guess you are right it should be a hardware issue
thanks for the suggestions
evilcuber
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yeah it is connected .. I have checked all the connections before posting
thanks for helping
same happened to my phone
Hi guys I wonder if you can help me. My friend broke his Wildfire S screen and asked me if I could fix it. I got a new glass / digitiser from eBay and replaced the screen. All look fine to me so I took it back to him.
It seems since replacing the screen the phone sometimes refuses to wake up when clicking the lock button, or when an inbound call arrives. The phone rings but there is no sign of life other than the ringing noise. If you then plug in the charger the screen will turn on and you can use the phone as normal. I've tried a factory reset on it but nothing seems to help.
I haven't replaced the LCD just the glass/digitiser, and can't think of a reason in doing so would break other functions of the phone. Can anyone help or suggest what might be the problem here? I'm a competent repairer and have replaced the screens on many Laptops, iPhone's and iPad's but this is my first encounter with a HTC.
I believe it is a stock ROM branded O2 - Details from the phone are ...
Android Version - 2.3.5
HTC Sense Version - 2.1
Software Number - 2.26.206.1
Kind Regards
Plasma
i have a similar problem,
I have replaced the digitizer but the phone doesnt start. I press the lock buttom and the phone vibrates, but the screen is black, nothing apears...
What can i do?
I would like to know...
I've no idea been trying for ages, I'd like to try a newer ROM but can't get the phone in to S-OFF.
I've done the whole HTC Dev thing and unlocked the boot loader etc, but can't find a stock rom / RUU that will flash to it.
And here's me thinking this site was going to be helpful and full of people who knew what they were talking about!
Plasma
esedust said:
i have a similar problem,
I have replaced the digitizer but the phone doesnt start. I press the lock buttom and the phone vibrates, but the screen is black, nothing apears...
What can i do?
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Click to collapse
I resolved this changing the screen lcd panel
Hello there
Im hoping that someone here can help me since im ready to seel the pho for spare parts... i've tried it all.
Heres the deal:
- The phone boots well and if i connect it through usb to the computer i can even access the folders and all.
- I can take photos (i her the sound of the shutter and all and see the piics taken in the folder when connected to the computer) and screnshots
- I managed to restore the phone back to original settings and even update software with sony official soft.
- Inicialy i bought the phone as faulty to try and fix it since the buyer informed me there was no water damage ( and i can confirm this because the "stickers" only show white). He informed that the phone just stoped showing image on screen.
- I thought it was a problem with the LCd so i bought a new one and replace it. The problem persists. Everything works but the screen.
Any toughts on this one? Could the motherboard be faulty in only one place (image, proximity sensor, etc)?
Thanks for you time
Regards
Try the service manuals...
edinacio said:
Hello there
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I have fully same faulty 2nd "spare parts" phone.
All works except screen, all as you described.
I checked, in my case problem definitely in screen because if connect main board to really working LCD panel = screen ok.
And vice versa: if connect normal main board to this probably faulty screen = black screen.
Maybe here broken flexible connector.
Also nothing interesting related to this case in service documents.
Hello,
I have a huge problem with my Desire 820. The screen is broken but phone is still working. Screen is completely black. Unfortunatelly I restarted it so I can find out whether it is on or off only by the vibration when phone is starting. Question is if there is any possibility to retrieve my photos? When I connected the phone to my laptop it can't see it...
Hi,
Had my phone a couple of years, no problems, but recently cracked the screen.
Bought three replacement screens and fitted them in phone:
* 1st one touchscreen digitiser worked perfectly all the time but LCD was broken (had lines/artifacts on it) - sent it back.
* 2nd one, same supplier as first, LCD worked, but digitiser works intermittently - it always works immediately after phone reboot, but after the screen locks for the first time, it then has a problem where it registers an input when I'm not giving any, so the screen goes haywire and I can't even enter my pin or restart phone (Have to use red button in sim card bay). Occasionally and randomly when I try it, it sometimes works so I can enter my pin, and then use the phone until the next time the screen locks....but basically phone is rendered unusable, because this is totally random. Sent this one back too.
* 3rd one bought from a different supplier - AFAIK this one is a genuine Sony part (it at least has the Sony logo on it), but have the same digitiser problem as the second. Time has passed to send this back.
Due to the above description I am sure it is not a problem with the phone (1st one digitser worked perfectly & original cracked screen digitser worked for half the screen where it wasn't cracked). I'm also sure it's a software issue, since it works everytime following a phone reset but before the screen is locked. Behaviour seems to be the same at different temperatures. Also inspected the flex connector and ribbon components under microscope at work, and saw no problems.
One think I noticed is that all 3 screens I bought have no insualting backing on the back of the LCD, so the metal back touches the metal shield below - I did not see any screens to buy with the insulating backing - I wondered if this could be affecting the EMC behaviour of the screen (some capacitivie coupling with the digitiser or some type of grounding issue) - but then why would the digitiser of 1st screen work ok, and work for >1hour following a reset but then not after a screen lock?
Tried turning glove mode on/off - no difference in behaviour. Tried using screen while it is not fitted in phone housing (not touching metal shield), same behaviour.
I saw a couple of threads from a while back, but don't know if they are up to date, or if a solution to this problem is now known:
https://forum.xda-developers.com/showthread.php?t=2691849
This one gives a solution, but then says at the top of the thread DON'T TRY THIS FIX, IT IS A HARDWARE ISSUE NOT SOFTWARE.....so I'm worried to try it.
https://forum.xda-developers.com/showthread.php?t=2662457
This one is to adjust the touchscreen sensitivity, but even though I have root access, I get an error message relating to the mount commandwhen trying to copy the edited idc file back to the system\usr\idc directory, "operation not permitted'.
Does anyone know a reliable fix that works? Or how I can get write access to idc folder to try editing the clearpad file? I don't have an SD card for my phone, but not sure it is essential for these methods?
Thanks
Nabla_x said:
Hi,
Does anyone know a reliable fix that works? Or how I can get write access to idc folder to try editing the clearpad file? I don't have an SD card for my phone, but not sure it is essential for these methods?
Thanks
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Assuming you're on LP 5.1... System rw access is disabled by default, even with root. Flashing dual recovery by NUT is easiest way to get it. Then you should be able to move files in boot or in recovery.