White Screen on MacBook Pro 13" Late 2011 but External Video Works

I have a MacBook Pro 13” Late 2011 that no longer displays video to its LCD.  The screen is lit and white but nothing can be seen otherwise.  I've connected an external monitor and it works well.  I've taken the machine apart as I was also having problems with the WiFi reception.  I was able to determine the problem with the WiFi was that the wires had become torn where there is factory stripping near what appears to be a grounding screw.  All three of these wires were torn.

Could these three wires being separated be the cause of the video too?
LVL 1
1namylnAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

strungCommented:
Apple has an extended repair program for this problem:

http://www.apple.com/support/macbookpro-videoissues/

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
1namylnAuthor Commented:
That would be great. I purchased the item second hand. Do u have to be the original owner?  If so then how should this issue be repaired?
strungCommented:
I don't know if you have to be the original owner. I suspect not. Repair requires replacing the logic board.
Protecting & Securing Your Critical Data

Considering 93 percent of companies file for bankruptcy within 12 months of a disaster that blocked access to their data for 10 days or more, planning for the worst is just smart business. Learn how Acronis Backup integrates security at every stage

strungCommented:
If you have an Apple store nearby, I suggest you make an appointment at the Genius bar. They won't charge you to diagnose the problem.
1namylnAuthor Commented:
I use EE to diagnose and repair issues.  That said, often when I post questions about Apple products someone always says go to the Genius bar?  If I had one nearby that would be an option but the nearest is 2 hours away.

If I were going to repair myself my assumption is it would take a motherboard replacement to repair...
strungCommented:
That is correct. Probably prohibitively expensive for a machine of that age. And if Apple will repair it for free, it is worth the drive. You could phone them first. They will want a serial number.
strungCommented:
You can order a new logic board and get instructions on how to replace it here:  https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Late+2011+Logic+Board+Replacement/7658

Cost is $375 for the 2.4 GHz logic board or $850 for the 2.8 Ghz logic board.
strungCommented:
I would suggest you phone Apple first, give them your serial number, and find out if you are eligible for a free replacement.
1namylnAuthor Commented:
^^Will do.  Thank you!
serialbandCommented:
I frequently check warranty status online.  http://selfsolve.apple.com/

If the screen is white without any video, that just suggests the Backlight LEDs work and the LCD Video signal doesn't.  You could take a picture of the board to show what cables broke.

If everything else is working and you're getting external video, then it's likely not the motherboard.  The video problem listed on the link that strung provided suggests a failure in the video chip.  That would necessitate a motherboard replacement, but your description doesn't exactly match the conditions described there. You may need to replace the screen, which includes the connector, if that's what's torn.  If you have a picture of those broken cables, that would help with the diagnosis.

When you got it 2nd hand, was it from eBay?  Did the seller describe the problems with it?
strungCommented:
@serialband - checking the warranty from the serial number won't help. A 2011 is clearly out of warranty. The only question is whether the problem is covered by the recall.
serialbandCommented:
@strung - It depends on when it was purchased.  There are 3rd party vendors, and Apple's own refurbished offerings, that sell slightly older model MacBooks that still qualify for 3 year Applecare.  It's always worth checking, since it's, at most, 1 year out of warranty, and takes only a few seconds to look up to be sure.  If it were older than a year, then I wouldn't have suggested it.
1namylnAuthor Commented:
strungCommented:
That doesn't look healthy.
1namylnAuthor Commented:
Sure doesn't.  In my opinion its a design flaw.  The wires were torn at the factory stripping.  Initially it was difficult to tell as the stripped wire is concealed by a small copperish piece of tape that has a screw through it.  Very strange.  I'm not sure of its purpose.
serialbandCommented:
Those look too cleanly cut to me.  None of those are video cables.  They are antenna cables for Bluetooth, 2.4 GHz Wifi, and 5 GHz Wifi.  Bluetooth and Wifi can still work, but the range will now be very limited.  They have nothing to do with your display.  They're basically just shielded wires that connect to the bare antenna wire on the back of the LCD panel.  They're shielded near the motherboard to prevent interference to and from the motherboard.  You could just solder these cables back up and they'll work again.

Please check step 17 of the ifixit link that strung provided for the video cable. (https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Late+2011+Logic+Board+Replacement/7658)   See if it is connected properly.  Also, you may have to open up the LCD panel to see if something was cut there.  The Macbook outputs correct video through the display port, so the Video Chip is working correctly.  The motherboard is not likely the culprit.  The problem is more likely to be a broken cable or the LCD panel itself.  The backlight is a separate circuit.
1namylnAuthor Commented:
At this point I'm just going to put the device on eBay for parts.  No time to continue working on it and if this one failed this way my guess is the next could do the same.  Thanks for your efforts.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Apple Hardware

From novice to tech pro — start learning today.