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
Related
OK, so a couple weeks ago i wake up after a hazy night to find my screen cracked on my wizard. replacement touch screen finally comes in today, phone comes apart fine, getting the old touch matrix off was semi-difficult but i got it off without ruining the LCD and put the new touch matrix on.
package everything up and no touch.
the ribbon cable from the old touch matrix was a bit of a pain to get off of the LCD module, 2 traces came off fine but 2 left a copper residue, i managed to get off one. regardless, i busted out the multimeter and did a continuity test and the points are all good.
just wondering if anyone has any experience in getting this working? i'm going to try to open it up again and get off the rest of that copper residue, but considering the ribbon cable to the LCD works fine, i'm guessing it must be where the touch matrix connects to the LCD.
it seems HTC only puts a piece of tape over the ribbon connector to make the connections to the LCD. am i wrong? any input is much appreciated. thanks!
hi, i have dissasemblied my hd2 and taken out all the things it has as it says on the youtube video. my problem is tha i can disasembly the screen so i can see the cable which connects screen to motherboard. It must have been unpluged from the previous unsuccessful disassembly i did.
Please help!! the phone works except of the touch screen
To disassemble the screen and the mother board, you need to heat at 60°c with a heater gun and after that, it's possible to put very carefully a knife or something else between the screen and the motherbord all around the longer sides. I do this, it's not so difficult.
The bigger problem is to disassemble touch scren & LCD.
I think it's better to buy a complette assembly module replacement.
Be carefull also that if you choose to replace Touchscreen alone, there two type :
One is with soldered cable, the other not. Soldering cable is very difficult and source of problem.
I'm curently waiting for new LCD module + touchscreen, I hope my HD2 will work again...
Yesterdag I repaired a HD2 from a client.
His HD2 was one month before repaired by HTC because the motherboard was getting to hot and begun a rebootcycle. So HTC replaced the motherboard (i think)
One week ago, my client sat on the side of his HD2 and the LCD cracked (not the glass). No warranty anymore via HTC so he came to me.
So I was going to open the HD2 and I saw many faults during earlier repair (see the attachment).
I replaced the whole LCM, (i've done this repair for like a million times) and tested the LCM and it was working fine.
But when I placed the housing back, the backlight of the screen stops working after pressing to hard on the housing. I think some connections on the motherboard ain't working right. Maybe a short circuit?
Anybody knows what this problem can be?
Again, without the housing, the LCM module is working fine, no backlight problems.
Attachment (very important!):
See the bad report about earlier HTC repairment here:
http://www.touchfix.nl/reparaties/Reparatie HD2 HT033NW05788 27-02-2011.pdf
Nobody that has this problem before?
I'd say check for any loose connections 1st. If the housing itself is causing the backlight function to stop, it could be something more internal with the LCD/digitizer.
I'd say the digitizer must be replaced as a (whole unit together -LCD and digitizer together) as it looks to be damaged based on your point that the back-light does not work or stops functioning when pressure is applied.
By the way how did you repair those brass clips that were bent? Can one find replacements?
Look forward to your reply..
Good luck
xlr8me said:
I'd say check for any loose connections 1st. If the housing itself is causing the backlight function to stop, it could be something more internal with the LCD/digitizer.
I'd say the digitizer must be replaced as a (whole unit together -LCD and digitizer together) as it looks to be damaged based on your point that the back-light does not work or stops functioning when pressure is applied.
By the way how did you repair those brass clips that were bent? Can one find replacements?
Look forward to your reply..
Good luck
Click to expand...
Click to collapse
Yes I replaced the whole LCD and digitizer, its called the LCM (see my first post).
But a strange thing is, that if I press on the battery cover (with some pressure)
it will turn sometimes on..
Any ideas?
Hey guys,
I have a problem. A week ago I dropped my hd2 and the screen was smashed. I took it to the service and they replaced the digitizer. Now, as it turned out the lcd displays badly and the say it has to also be replaced. I know that after the drop the lcd worked fine. Now it looks like this: http://img857.imageshack.us/i/imag0001u.jpg
My question is - is this broken lcd? it has to be removed? or can I do something with it? is it the fault and they've done something wrong?
Thanks for answers.
Read this post by XDA member Facdemol, this post will help you answer your question.
emjakmaciej said:
Hey guys,
I have a problem. A week ago I dropped my hd2 and the screen was smashed. I took it to the service and they replaced the digitizer. Now, as it turned out the lcd displays badly and the say it has to also be replaced. I know that after the drop the lcd worked fine. Now it looks like this: http://img857.imageshack.us/i/imag0001u.jpg
My question is - is this broken lcd? it has to be removed? or can I do something with it? is it the fault and they've done something wrong?
Thanks for answers.
Click to expand...
Click to collapse
Unless they just haven't connected the LCD properly (very unlikely), there's definitely a problem with it... I'm afraid I think it'll have to be replaced.
in turkey if there is a digitizer problem they change the whole screen.
Under the TMOUS warranty they will replace your phone if an issue comes up like that because it's usually just an unlucky roll of the dice if your LCD does that.
because your problem seems to occur after a mechanical shock, i would suspect 2 scenarios.
1. You have a bad connection between the display flex connector and phone's motherboad. This can either be caused by motherboard display connector failure, some small pins on that connector got busted when the phone was either dropped or once the digitizer was changed. I give pretty small chances for this to have happened.
2. If you see a phone lcd stripped down of it's housing, you will notice that on the bottom part of it (or lateral one on some displays) you can see a flex cable coming from the display's glass-like surface to the back of it. It sits pretty tight around one edge of the screen. It connects the TFT matrix to the processing part (column&row controllers) on the back of the display (or on the flex cable/phone motherboard .. ). If a phone is hit from one side, the case and display housing can press hard on this flex cable and break it, or puncture it. In this case, some of the signals needed to drive some specific areas of the tft matrix aren't getting to the matrix itself so you see some lines on the screen (plus color rendering errors). Sometimes, improper manipulation of the screen when assembling back the phone can also cause the problem.
I give more chances to this scenario.
If number 1 could be fixed by a simple phone disassemble and connector checking, number 2 will indeed require a new display as there isn't any way to service that broken flex cable.
My previous posts about display problems tried to focus on "naturally occurring" problems, not ones induced by electric/mechanical shocks. So in this case, my above scenarios will be more suited as likely suspects for your problem.
I have a T-Mobile HD2. A few months ago, the digitizer got a little crack but touch was working fine, so I order a new digitizer and replaced it. No matter what I did, the touch wouldn't work with the new digitizer (I know about front buttons putting pressure on digitizer ribbon cable which sometimes results in touch not working).
I thought problem might be the LCD connection slot for digitizer, so I order a new LCD too. But even with new LCD and new digitizer still touch doesn't respond! What am I doing wrong?
This problem is still baffling me. Right now, I have 2 sets of digitizers and LCDs (old ones and new ones I purchased) and no matter what combination of them I use, digitizer is not responding.
I have to say the old digitizer used to work fine before I opened up this phone, it was just it had a little chip/crack in the edge so I wanted to replace it just to make it nicer. But now digitizer won't work at all!
Is there supposed to be an insulating layer between digitizer and LCD? What wrong did I do by opening up this phone? I was very careful. The only thing I am not putting back for now is the front keys and its flex cable. Other than that, all what I took apart before, I have put back!