[Q] Digitizer not working after reassembly

Ening · May 14, 2014

Hi everyone.
So i tried to replace the cracked screen in a Moto G (I just replaced the display+digitizer+glass module). After the reassembly everything worked except for the digitizer (it worked before when i tested it). I tried to reconnect the digitizer connector (the tiny one which connects the digitizer controller to the display connector ) multiple times, but nothing worked. Has anyone faced a similar problem before?

agnobi · May 19, 2014

Ening said:
Hi everyone.
So i tried to replace the cracked screen in a Moto G (I just replaced the display+digitizer+glass module). After the reassembly everything worked except for the digitizer (it worked before when i tested it). I tried to reconnect the digitizer connector (the tiny one which connects the digitizer controller to the display connector ) multiple times, but nothing worked. Has anyone faced a similar problem before?

Hi, I have exactly the same problem.

In my case, it's my second screen, so I've already eliminated the screen+digitizer and the cable connector like the origin of the problem.

Has anyone any idea?

Thanks!

PS: Ening, did you get to solve your issue?

Ening · May 19, 2014

much sad

agnobi said:
Hi, I have exactly the same problem.

In my case, it's my second screen, so I've already eliminated the screen+digitizer and the cable connector like the origin of the problem.

Has anyone any idea?

Thanks!

PS: Ening, did you get to solve your issue?

Bad news. My digitizer cable is damaged. On both original phone and the donor. I was not careful enough: the closer inspection showed it. I am going to order another screen or a donor phone (like a used verizon one or something) and try it again.

So the thing is that the video on etradesupply shows it wrong. You have to unstick the tape covering the digitizer cable connector, then unsnap the clicky thing, and only after that should you unplug the screen master cable (the one that goes into your PCB). Otherwise, it is very easy to damage the touchscreen controller cable (the digitizer one).

I really hope you have a different problem and there is still hope for your phone :crying:

agnobi · May 20, 2014

Ening said:
Bad news. My digitizer cable is damaged. On both original phone and the donor. I was not careful enough: the closer inspection showed it. I am going to order another screen or a donor phone (like a used verizon one or something) and try it again.

So the thing is that the video on etradesupply shows it wrong. You have to unstick the tape covering the digitizer cable connector, then unsnap the clicky thing, and only after that should you unplug the screen master cable (the one that goes into your PCB). Otherwise, it is very easy to damage the touchscreen controller cable (the digitizer one).

I really hope you have a different problem and there is still hope for your phone :crying:

Hi Ening,

How do you check the veracity of the cable connector failure? I think I have the same problem than you, but I haven't a way to check it 100%, because I haven't anyone who can lend other screen to me, and the original screen it's now completely destroyed.

I suppose that I will have to send back the screen to the seller and ask for another.

Thanks anyway!

Ening · May 20, 2014

agnobi said:
Hi Ening,

How do you check the veracity of the cable connector failure? I think I have the same problem than you, but I haven't a way to check it 100%, because I haven't anyone who can lend other screen to me, and the original screen it's now completely destroyed.

I suppose that I will have to send back the screen to the seller and ask for another.

Thanks anyway!

Hi, i gave the phones to a guy in a repair shop and he looked at it through a magnifying glass

denseye · Jul 3, 2014

agnobi, I have exactly the same problem, but tested several digitizers and same problem

see my post here : http://xdaforums.com/moto-g/help/black-screen-backlight-ok-screen-t2803431

did you solve your problem ?

kyle77680 · Jul 3, 2014

Me too

The new digitizer doesn't work and now the 'old' digitizer dosn't work anymore

Everyone has found an solution ?

liveroy · Jul 3, 2014

kyle77680 said:
Me too
The new digitizer doesn't work and now the 'old' digitizer dosn't work anymore
Everyone has found an solution ?

The flex cable part that connects the controller to the rest of the cable is very thin and easy to damage, you've to be very careful or you're gonna screw it (like the OP did).
ofcourse there is a slight possibility that it came defective, but you should have checked it right when it arrived. So far I haven't seen any incomparable ones, but who knows.....

denseye · Jul 3, 2014

liveroy said:
The flex cable part that connects the controller to the rest of the cable is very thin and easy to damage, you've to be very careful or you're gonna screw it (like the OP did).
ofcourse there is a slight possibility that it came defective, but you should have checked it right when it arrived. So far I haven't seen any incomparable ones, but who knows.....

I think there is something else.
On my side, the 3 digitizers (old one + 2 new) give me same result.
The I think the problem should be on the mainboard or a hardware/software blocking ... or maybe something we didn't re-assemble well

and little question : what is the role of this part (see my photo) ???

liveroy · Jul 3, 2014

denseye said:
I think there is something else.
On my side, the 3 digitizers (old one + 2 new) give me same result.
The I think the problem should be on the mainboard or a hardware/software blocking ... or maybe something we didn't re-assemble well

and little question : what is the role of this part (see my photo) ???

Probably the last :>
That thin metal plate makes connections on the back of the PCB (its mounted right between the display and the PCB) and I think it connects to mass.I got no idea what it's role is (prolly its a fitting or some sort of heatspreader).I've assembled one phone without it and it worked just fine, but I've put it back afterwards, just for the sake of being complete

kyle77680 · Jul 3, 2014

and your digitizer works fine ?

I think also that the issue comes from the connection PCB-patch or as you said software digitizer blocking.

So I 'll try to flash a retail rom to see it .... ...... The digitizer still not working

liveroy · Jul 3, 2014

kyle77680 said:
and your digitizer works fine ?

I think also that the issue comes from the connection PCB-patch or as you said software digitizer blocking.

So I 'll try to flash a retail rom to see it .... ...... The digitizer still not working

I've replaced 9 digitizers on 9 different moto g's.None of em had any kind of these problems.This leads me to the conclusion that you've done something wrong.
The worst I had is 1 dead pixel on one of the new displays ( I'm using digitizer+display+frame assembly ).

denseye · Jul 3, 2014

liveroy said:
I've replaced 9 digitizers on 9 different moto g's.None of em had any kind of these problems.This leads me to the conclusion that you've done something wrong.
The worst I had is 1 dead pixel on one of the new displays ( I'm using digitizer+display+frame assembly ).

very interesting your experience ...

the strange thing is that we are several persons to have the same problem and the same symptoms ...:silly:

kyle77680 · Jul 3, 2014

I've unsnapped the connector as they said in the video of etradesupply...
Maybe I've forgotten something.... you have followed this video ?

Edit :My screens are working except for the digitizer.

denseye · Jul 3, 2014

kyle77680 said:
I've unsnapped the connector as they said in the video of etradesupply...
Maybe I've forgotten something.... you have followed this video ?

I've followed this same video...
I don't see what I could have done wrong

liveroy : you never expected that black screen problem ?

---------- Post added at 04:25 PM ---------- Previous post was at 04:23 PM ----------

kyle77680 said:
and your digitizer works fine ?

I think also that the issue comes from the connection PCB-patch or as you said software digitizer blocking.

So I 'll try to flash a retail rom to see it .... ...... The digitizer still not working

I've also reflashed a stock ROM ... no change

so it's not software/firmware related ...

so it's hardware

liveroy · Jul 3, 2014

Never, all worked the first time and afaik they are still working fine.Gotta mention that the ones I`ve used are chinise ones, but look and feel like the original, even the glass feels like gorilla glass 3, altough I don't believe that's the case :>

Clarkiieh · Jul 3, 2014

I have a huge scratch down my screen and the local mobile repairing guy quoted £55 to replace.. I thought this was a bit steep.. I expect him to use real gorrila glass 3 @ that price

Sent from my XT1032 using XDA Free mobile app

kyle77680 · Jul 3, 2014

finally I've just fix my digitizer

It was 1 or 2 pin twisted on the right so there wasn't a contact between the PCB and the patch....

denseye I think your black screen can be fixed, you may see the pin on the left...." Bon courage " PM me if you have questions....

I've got now my earpiece which crackle but I thinks I'll not try to fix it....

Good night

denseye · Jul 4, 2014

You mean a pin on the pcb connector where thé LCD câble goes? (Français???)

kyle77680 · Jul 4, 2014

A pin means a spindle which links the patch(LCD câble) to the PCB.There are many pins which compose thé connector.

(Yeah I'm french

and i've sent you a MP.... "Dur dur le correcteur ortho ...")

[Q] Digitizer not working after reassembly

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