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

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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i face the same problem but i don't put any screw i don't know why how to come this problem

I need help fixing my backlight on my iPhone 6

Hello Jessa,

I have a board that I am working on witch has FL2179 ripped off and I replaced it with another one then I noticed the 3 screws had this issue were I could see the copper in them
I did manage to remove My First ever Screw thingamajig from the board and then another one but here is my question.
This phone for the most part still works other then the touch will not work.
I will be trying to change the touch IC chip on a donner to test and see if I got what it takes to do it but can a screw damage also create a "no touch" issue.

by the way keep up the great work we are looking upon you to get great advices.

What is the cost for this repair?

I am almost positive I committed the the "long screw damage" Tested multiple screens on the device. No luck.

Jessa, I'm lost here. My backlight problem came in as no previous repair. I changed diode, filters, IC & coil (kit). No middle screw damage. Everything seems fine tested around by ZXW. Still no BL. This is like the 3 one I've had this problem with. Changed everything & checked everything. It seems pretty simple and straight forward, yet what else could it be? Several I've done even by jumping, or changing components. Any ideas, or another thing to look at?

thnx very useful

We got a phone, customer said another shop did a repair and blammed the backlight on water damage. (we didn't see any water damage) Ordered a filter, etc like for the 5s and saw it looks like they put the wrong screw in. What is the cost of fixing this and the turn around.
Thanks
Phil

long screw can also damage other parts of iPhone 6 / 6S , however it is possible to fix these....we do fix it in Sweden.

Hi,
How much do you charge to do this repair, can you share the repair guide?

we are interested ,
Regards,
Peter



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