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iPhone 6 Long Screw Damage = No Backlight. Case Report.

December 26, 2014

iPhone 6:
LCD connector area bottom right screw.
Normal

 

iPhone 6: Long screw damage at same screw.  This is from a phone with no backlight after screen replacement  

By now many of you have heard of several iconic problems in repair:

 

  • The iPhone 4 audio ic failure, and fragile battery connector
  • The iPhone 4S  WiFi chip and also fragile battery connector
  • The iPhone 5 classic battery replacement U3 pry damage.
  • Samsung galaxy charge port failures
  • iPad mini backlight failure
  • "U2 chip failure" where the usb/charging logic ic chip fails in the iPhone 5 as well as all other devices that use the lightning charger--iPad 4, iPad mini, iPhone 5S etc.

 

Lately, we've been hearing about the "Blue Screen of Death" in the iPhone 5S--

Known causes:

  • Bad Proximity flex
  • Unknown error during repair solved by a software restore
  • Long screw damage---where traces on the board are damaged from putting the long screw in the short screw bracket.  


Tonight, I have a warning for you.  This may not end up being an iconic problem, it may be coincidental damage.  In any event, I want to share this case with the repair community.

 

iPhone 6  No Backlight after simple screen replacement:

An iPhone 6 comes in to a shop for what seems like a straightforward screen replacement.   However, the new screen does not light up.

After component failure was ruled out, this phone found its way to my microscope.

I confirmed the phone was turning on, but showing no display--not even on an original iPhone 6 display.   This seemed to be a straightforward backlight repair.  Raise your hand if you know what component(s) should be replaced to solve a standard backlight failure in this situation?  If you said "the coil" or "the backlight ic" punch yourself in the face and read Backlight 101.

Given the history, those of you who read Backlight 101 will recognize that this will most likely be connector damage or a bad backlight filter.  I have repaired a backlight from a water damaged iPhone 6 before, so I'd already mapped the backlight filters.   

I opened the phone and found very minor damage at the edge of the LCD connector, but all the pins intact.  I believe the connector is okay.   I uncovered the backlight filters and found that they showed no signs of damage, and had continuity as normal.   
I even used my new FLIR One infrared camera to make a heat map comparing this iPhone 6 to a normal iPhone 6.  Spot temperature measurements were largely the same.  No hot spot, so therefore no short circuit.

Since the history tells us the display was working fine after the drop and before the screen change attempt, what could be the problem?
Making a connection to the recent BSOD problem on the iPhone 5S, I took a hard look inside the screw brackets.   In a normal phone, the bottom of the screw bracket is nothing but the clean black coating of the solder mask applied to all non-conductive surfaces of the board.   Sometimes you can see blue plastic along the edges of the screw bracket from the plastic coating on the shaft of the screws.

iPhone 6:

Normal LCD connector area MIDDLE SCREW

 

iPhone 6:

No backlight after screen replacement
MIDDLE SCREW--long screw damage


In this phone, I could see copper.  Copper at the bottom of a screw bracket is bad--it means that the wrong screw was tightened in the bracket until it pierced the solder mask and continued to churn into the board.   Without the schematic or an x-ray machine, I can't be sure of any relationship between screw damage and the no backlight problem in this phone.    This might just be purely coincidental.

However, with no other findings for an iPhone 6 that has sudden onset of backlight failure with intact connector and filters----this could mean that more than ever we need to watch our P's and screws when doing screen replacements.

 

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hey man,, i have same problem when i am changing iphone 6 screen ,, i am sure before do sitch off but after changing lcd can't show display ..tell me what i can do now .. i am waiting for your reply

I hace an iPhone 6 dont lightin up, how much cost the repair?

We got one of these phones a few months back, screen was out after the lcd was replaced at another shop earlier the same day. Wrong screw in the wrong hole, screw i pulled out belonged in a longer area.

Didn't want to tpuch the phone because customer wanted to take it to the apple store.

So Jessa, was the repair the same as the 5s for BSOD? Were you able to repair it?

How the heck those technicians confuse the screw placement? It proves of their incompatibility. Shame on them!

Took my iPhone 6 in for repair and now have the same problem screen very dark as if on minimum brightness looks like screw damage. Jessa what's the repair process you did? sounds like more than diy job

Hi,i guess yiu have the solution to this unending problems of iphone 6 and 6plus,thanks for the picture,but what can we do to solve this problem,i have iphone 6 with itunes problem I've reloaded and flashed but same error,any solution pls thanks in advance

Hi ,

i don't know what's the problem of my iPhone 6 but when i change my iPhone 6 changed LCD than work fine normally but then 2-3 hour show me red and blue screen and after blue and red screen fix but my iPhone 6 go to recovery mode and now i restored my iPhone 6 then iTunes show me error 9 , 40 , 21 and now so only error 40. please suggest me what's the problem of my iPhone 6 and how can i fix ?

please help me :(

@jessa: how did you do it? Did you do some tutorial?



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