Question about Apple MacBook Air

2 Answers

I changed my macbook screen, and the backlight now will not work. Everything else works fine, just no light. My real question is what voltage should be coming from the inverter board. I read no AC or DC voltage at the output. The computer was dropped, the screen broken. I also need to know thw input voltages on the inverter.

Posted by on

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 502 Answers

This could be a backlight issue, an inverter issue or a logic board issue. Look at the screen closely, if there is a faint image it's either a backlight issue or inverter issue. To weed out between the two you can just order on inverter, they're 20 bucks on ebay, if that doesn't work, replace the backlight. Maybe the new screen was not wrapped right when it was shipped, that can easily break the backlight bulb. make sure you connected the inverter to the white and pink wires correctly. Backlight repairs are somewhat difficult. As much as I would like to be able to tell you a quickfix that will solve backlight the problem, it's a pretty arduous repair that requires 1-2 hours for a trained person. It's feasible to do it yourself if you're tech savy, but you'll most likely have to google for guides that show you exactly how to replace the backlight step by step. I work for Mac Repair NYC and i have to fix this problem a lot, it's so easy to break the lightbulb in the process.

Posted on May 27, 2009

  • Steven Sosnin
    Steven Sosnin Nov 19, 2013

    LOL takes you 1-2 hours? its a 20 min fix for a trained tech.

  • Steven Sosnin
    Steven Sosnin Nov 19, 2013

    but yes, it is difficult so i suggest getting some practice first. just buy a cracked complete lcd for like $30-$40 on ebay and replace the ccfl bulb (DO NOT SUGGEST TO INEXPERIENCED TECHS) and replace the inverter and the inverter power cable. It could also be a logicboard issue if all else fails. Under the inverter connector on the motherboard, the connection point wears off or builds residue in which case you clean it very carefully and/or you can melt some solder to the point after cleaning it ONLY IF NECESSARY (ALSO NOT RECOMMENDED FOR INEXPERIENCED TECHS). Unless, of course, you have dough to blow on a new MB.

×

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 40 Answers

Apple doesn't provide voltage information for the Inverter Board.
If you are getting external video then check to see if there is a dim (un-backlit) image on the display to ensure it is a backlight problem. If so then the chances are good you have a failed inverter board.

Posted on Mar 01, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My pc doesnt' work


Can you hear the mac startup sound? If you hear then its booting up.

Let it finish booting. Press the Brightness keys on the keyboard "F1 and F2" does the screen backlight turns on? if not use a flashlight and shine it on the screen.if you can see your desktop then your backlight has problems.

Apr 03, 2014 | Apple MacBook Mac Notebook

1 Answer

Locked


Resetting the PRAM may do the trick:
You reset the PRAM by rebooting a Mac and then immediately hold down the Command+Option+P+R keys, you will then hear the Mac reboot sound again, signifying your PRAM has been reset. You must hit the key combination before the grey screen appears otherwise it won't work.

you've tried rebooting, you've reset the PRAM, you've done it all, but your Mac is still behaving strangely. What next? In certain circumstances, resetting your Mac's System Management Controller (SMC) can be a solution. This is sometimes necessary to restore normal lower level system functionality to your Mac.

Here's how to reset the SMC on any type of Mac (and any version of OS X) and the type of problems that it may resolve.
When & Why Reset SMC on a Mac? Some Common Hardware Reasons

Typically it's power and hardware related issues that can be helped or resolved by resetting a Mac SMC, particularly if you're having these types of problems:

* Issues with your Mac's cooling fans and fan management: fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc

* Power management and battery problems: Mac isn't turning on, sleep isn't working, random shutdowns and reboots, battery isn't charging, Mac won't wake from sleep etc

* Light problems and improper lighting management: battery indicator lights aren't working, display backlighting isn't adjusting to ambient light changes, keyboard backlights not working, etc

* Video and external displays not working: display brightness functionality not working properly, target video mode isn't working properly, external display isn't working, etc

* General performance and functionality problems: abnormally sluggish behavior despite no CPU or disk usage, external ports not working, airport & bluetooth aren't showing up, external devices are not being found, etc

So now that you've concluded you need to reset your SMC (Note that the SMC is on Intel Mac's only), here's how to do it on MacBook's, MacBook Pro's, iMac's, Mac Mini's, and Mac Pro's. Notice that the reset instructions are different for MacBook and MacBook Pro's if you have an internal or detachable battery.
Reset SMC of a MacBook Air, MacBook Pro Retina, or MacBook Pro's with an internal non-removable battery

This is how to reset SMC on most modern Mac laptops:

Shutdown your MacBook Air / MacBook Pro
Connect the power adapter to your Mac
On the MacBook/Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
Release all keys and the power button at the same time
Boot your Mac as usual

Here's the key sequence to hold down:

Reset the SMC of a MacBook Air or Retina MacBook Pro

Do keep in mind that by resetting the SMC you will lose power specific settings, like the time it takes to sleep a Mac and other customizations to power settings. No big deal, but if you have made many changes to your hardware behavior you will want to adjust stuff like sleep behavior again.
Reset SMC of an iMac, Mac Pro, Mac Mini

Resetting SMC is different for non-portable Macs:

Shut down your Mac
Disconnect the power cord
Press and hold the Mac's power button for 5 seconds
Release the button
Reattach the power cables and boot the Mac as usual

Reset the SMC of a MacBook or MacBook Pro's with detachable batteries

mac reset the smc Older MacBook laptops with a removable battery can reset SMC with the following approach:

Shutdown the MacBook/Pro and remove the battery
Disconnect the power adapter, hold the Power Key for 10 seconds
Release the power key and reconnect your battery and power adapter
Turn your Mac on
Let boot as usual

Hopefully that will clear up your problems, if not it might be worth a visit to the Apple Store or a certified repair center.

Happy New Year,
Kerry

Feb 23, 2014 | Apple Air Mac Laptops

1 Answer

Macbook pro dark screen


Close the lid, attach an external monitor, reopen lid.
Your display should now show on that monitr. If it is, your display on the MacBook Pro may be bad. I would try resetting the PRAM and the SMC before going to an Apple store. The SMC controls the MacBook's power founcts (see below)

Resetting the PRAM may do the trick:
You reset the PRAM by rebooting a Mac and then immediately hold down the Command+Option+P+R keys, you will then hear the Mac reboot sound again, signifying your PRAM has been reset. You must hit the key combination before the grey screen appears otherwise it won't work.

you've tried rebooting, you've reset the PRAM, you've done it all, but your Mac is still behaving strangely. What next? In certain circumstances, resetting your Mac's System Management Controller (SMC) can be a solution. This is sometimes necessary to restore normal lower level system functionality to your Mac.

Here's how to reset the SMC on any type of Mac (and any version of OS X) and the type of problems that it may resolve.
When & Why Reset SMC on a Mac? Some Common Hardware Reasons

Typically it's power and hardware related issues that can be helped or resolved by resetting a Mac SMC, particularly if you're having these types of problems:

* Issues with your Mac's cooling fans and fan management: fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc

* Power management and battery problems: Mac isn't turning on, sleep isn't working, random shutdowns and reboots, battery isn't charging, Mac won't wake from sleep etc

* Light problems and improper lighting management: battery indicator lights aren't working, display backlighting isn't adjusting to ambient light changes, keyboard backlights not working, etc

* Video and external displays not working: display brightness functionality not working properly, target video mode isn't working properly, external display isn't working, etc

* General performance and functionality problems: abnormally sluggish behavior despite no CPU or disk usage, external ports not working, airport & bluetooth aren't showing up, external devices are not being found, etc

So now that you've concluded you need to reset your SMC (Note that the SMC is on Intel Mac's only), here's how to do it on MacBook's, MacBook Pro's, iMac's, Mac Mini's, and Mac Pro's. Notice that the reset instructions are different for MacBook and MacBook Pro's if you have an internal or detachable battery.
Reset SMC of a MacBook Air, MacBook Pro Retina, or MacBook Pro's with an internal non-removable battery

This is how to reset SMC on most modern Mac laptops:

Shutdown your MacBook Air / MacBook Pro
Connect the power adapter to your Mac
On the MacBook/Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
Release all keys and the power button at the same time
Boot your Mac as usual

Here's the key sequence to hold down:

Reset the SMC of a MacBook Air or Retina MacBook Pro

Do keep in mind that by resetting the SMC you will lose power specific settings, like the time it takes to sleep a Mac and other customizations to power settings. No big deal, but if you have made many changes to your hardware behavior you will want to adjust stuff like sleep behavior again.
Reset SMC of an iMac, Mac Pro, Mac Mini

Resetting SMC is different for non-portable Macs:

Shut down your Mac
Disconnect the power cord
Press and hold the Mac's power button for 5 seconds
Release the button
Reattach the power cables and boot the Mac as usual

Reset the SMC of a MacBook or MacBook Pro's with detachable batteries

mac reset the smc Older MacBook laptops with a removable battery can reset SMC with the following approach:

Shutdown the MacBook/Pro and remove the battery
Disconnect the power adapter, hold the Power Key for 10 seconds
Release the power key and reconnect your battery and power adapter
Turn your Mac on
Let boot as usual

Hopefully that will clear up your problems, if not it might be worth a visit to the Apple Store or a certified repair center.

Happy New Year,
Kerry

Jan 12, 2014 | Apple Mac Laptops

1 Answer

Keyboard Backlit not coming on at all


Set your backlighting in
Apple menu
System Preferences
Keyboard.

otherwise try:
Resetting the SMC on any type of Mac (and any version of OS X) and the type of problems that it may resolve.
When & Why Reset SMC on a Mac? Some Common Hardware Reasons

Typically it's power and hardware related issues that can be helped or resolved by resetting a Mac SMC, particularly if you're having these types of problems:

* Issues with your Mac's cooling fans and fan management: fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc

* Power management and battery problems: Mac isn't turning on, sleep isn't working, random shutdowns and reboots, battery isn't charging, Mac won't wake from sleep etc

* Light problems and improper lighting management: battery indicator lights aren't working, display backlighting isn't adjusting to ambient light changes, keyboard backlights not working, etc

* Video and external displays not working: display brightness functionality not working properly, target video mode isn't working properly, external display isn't working, etc

* General performance and functionality problems: abnormally sluggish behavior despite no CPU or disk usage, external ports not working, airport & bluetooth aren't showing up, external devices are not being found, etc

So now that you've concluded you need to reset your SMC (Note that the SMC is on Intel Mac's only), here's how to do it on MacBook's, MacBook Pro's, iMac's, Mac Mini's, and Mac Pro's. Notice that the reset instructions are different for MacBook and MacBook Pro's if you have an internal or detachable battery.
Reset SMC of a MacBook Air, MacBook Pro Retina, or MacBook Pro's with an internal non-removable battery

This is how to reset SMC on most modern Mac laptops:

Shutdown your MacBook Air / MacBook Pro
Connect the power adapter to your Mac
On the MacBook/Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
Release all keys and the power button at the same time
Boot your Mac as usual

Here's the key sequence to hold down:

Reset the SMC of a MacBook Air or Retina MacBook Pro

Do keep in mind that by resetting the SMC you will lose power specific settings, like the time it takes to sleep a Mac and other customizations to power settings. No big deal, but if you have made many changes to your hardware behavior you will want to adjust stuff like sleep behavior again.
Reset SMC of an iMac, Mac Pro, Mac Mini

Resetting SMC is different for non-portable Macs:

Shut down your Mac
Disconnect the power cord
Press and hold the Mac's power button for 5 seconds
Release the button
Reattach the power cables and boot the Mac as usual

Reset the SMC of a MacBook or MacBook Pro's with detachable batteries

mac reset the smc Older MacBook laptops with a removable battery can reset SMC with the following approach:

Shutdown the MacBook/Pro and remove the battery
Disconnect the power adapter, hold the Power Key for 10 seconds
Release the power key and reconnect your battery and power adapter
Turn your Mac on
Let boot as usual

Hopefully that will clear up your problems, if not it might be worth a visit to the Apple Store or a certified repair center.

Happy New Year,
Kerry

Jul 08, 2012 | Apple MacBook Air

1 Answer

Cable to Display from motherboard has change and i get a now backlight image on screen, the book goes fine on micro dvi to dvi and i gor the camera working too. What is the problem ? the screen the...


If you can see the LED back lights then the screen is at fault. If you have a logo permanently etched onto the screen then this is also going to need a new display.
(Have a Google around for screen burn-in) If the fault is temperamental try moving the display back and forth, if you have issues then this means it is the cable running from the motherboard to the display.

Mar 01, 2011 | Apple MacBook Air

1 Answer

MacBook 13" starts but screen is barely visible. Tried System Preferences - already on brightest setting. Works fine otherwise. Any ideas? Capt. Dave


could be your inverter board, whitch controls the backlight. I could very well be the backlight as well, but that is less likely. Inverter boards are not all too expensive, and if you are knoledgable with laptops, i would say doit yourself, but if you have any doubts, take it to apple, sur it will cost more, but it is the safet bet.

Jan 16, 2010 | Apple MacBook 13"White /2.0Ghz Intel Core2...

2 Answers

Macbook Pro Dimmed but see the image clearly


Here is a photo. It is the white circled part.
ibook-backlight-fuse-link_w0qqitemz350223168231qqcmdzviewitemqqimsxz20090708.jpg

Jul 10, 2009 | Apple MacBook Mac Notebook

1 Answer

Macbook chip shim


Hello,
Thias can also come from a dead hard drive, or a dead backlight (screen).
The best test would be to plug an external monitor to see if something shows up. If yes, that would mean that the backlight doesn't work anymore. If not, then you have an other hardware problem (motherboard, hard drive).
You can check if the hard disk is the problem by removing it. You should then see a flashing question mark and the screen on.
Keep in touch ;)

Jun 25, 2009 | Apple MacBook Pro Notebook

2 Answers

Screen is dark or dead on my 17" Macbook Pro


This could be a backlight issue, a board issue or an inverter issue. Look at the screen closely, if there is a faint image it's either a backlight issue or inverter issue. To weed out between the two you can just order on inverter, they're 20 bucks on ebay, if that doesn't work, replace the backlight. Backlight repairs are somewhat difficult. As much as I would like to be able to tell you a quickfix that will solve backlight the problem, you'll most likely have to google for guides that show you exactly how to replace the backlight or bring it in for repairs.I work for Mac Repair NYC and i have to fix this problem a lot.

May 21, 2009 | Apple MacBook Pro Notebook

2 Answers

MacBook screen dims


first there could be many meanings of dims with a laptop screen one is backlight has turned off and it is difficult to see.  if that is the case use you brightness key to check if it is up, if it is more likely your inverter has gone up and in worse cases the screen. it may also start bright then change dim while loading
there is also the feature on mac to automatically dim the screen a little when unused for a set time.  to change this go to system preferences, go to energy saver, click show details, then move to options, and uncheck the the box that says "Automatically reduce the brightness of the display before display sleep".
i hope this is what you are talking about.

Mar 14, 2009 | Apple MacBook Mac Notebook

Not finding what you are looking for?
Apple MacBook Air Logo

847 people viewed this question

Ask a Question

Usually answered in minutes!

Top Apple Mac Laptops Experts

Louise Nadon

Level 1 Expert

3 Answers

Zarek

Level 1 Expert

6 Answers

Are you an Apple Mac Laptop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...