Droid 4 Flex Cable Replacement

Discussion in 'Droid 4 Tech Support' started by cfy7, Aug 9, 2013.

  1. cfy7

    cfy7 New Member

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    I have a Droid 4 that the touchscreen has begun to act up on. I've have in my hand a new flex cable for the phone, but upon taking the phone apart I've noticed 2 connections that have black tape around them. One is going to the front camera, and the other one goes to the screen. (at least I think it's for the screen)

    How are these connections made? Are they soldered?

    Is the flex cable even replaceable?

    Thanks!
     
  2. kmeleon

    kmeleon New Member

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    I have the same problem now: At first my touchscreen reacted only if the keyboard was retracted. After one more day it doesn't react at all anymore. I searched for a new flex ribbon cable, but wasn't sure, how the LCD is connected to this flex ribbon cable, so I didn't bought it yet. As I was determined to even kill the Droid 4 due to the malfunction, I disassembled it again, carefully pulled the black tape off and tried to analyse how the connection is established. As the flex ribbon cable seems to be broken in my Droid 4 I even pulled off the two cables from each other. It felt like some sort of adhesive tape, which is glued to another tape. 25 PCB tracks and contacts on 7mm were revealed. No soldering! If I try to put the two just separated cables together, they are not sticking together again. There is no adhesive between them. Due to the REALLY small contacts (approx. 4 contacts on 1mm) there is absoluelty NO way to connect both cables together again, unless you have very good tools (i.e. microscope etc.). So, the only solution is to buy a LCD incl. flex ribbon cable.

    Does anyone know more about this connection? I'm really curious how this connection is made...
     
  3. shanook

    shanook Member

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    Motorola Droid 4, XT894 LCD Flex Cable Ribbon

    reviving this thread. i think this is what we need. did anyone try this? i'm having this issue now also. i dont want to go in and try to replace it. i can't find any guides on what to do.
     
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