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Repair information, troubleshooting tips, and guides for the sixth iteration of Apple iPhone, announced on September 12, 2012. Model: A1428, A1429

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Can control brightness after screen/digitizer fix...

I bought a screen/digitizer replacement on ebay for an iPhone 5. Everything works fine besides i have no control over the brightness. auto brightness is off. its extremely dark and unusable. Is there any way to fix this. could it be just a bum digitizer? I checked all connections and de-assembled an re-assebled twice. I don't think its the sensors since it does work when auto brightness is off. please help asap !!

Answered! View the answer I have this problem too

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You need to disconnect power from devices when performing repairs. unloading the backlight circuit while under power will cause this. your phones logic board will now require some components to be replaced. you must take it to someone who can perform microscopic soldering repairs.

There is a link on my profile if you would like to find a board repairer near you :)

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So in the past week i got 3 different diagnostics done at my local repair shops. The ruling is that theres a broken pin on the motherboard and its un-solderable. So my next attempt will be to replace the motherboard. :( or sell it "as is" for parts and hope i can get around 200-300. sucks.

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Hello, i have the same issue. Can anyone show which "pin & motherboard component" should be changed?

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If you experience "no backlight after screen or display replacement" or "very dim screen after screen or display replacement" it usually means you made a mistake or the screen flat cable had an exposed contact point that resulted in damage to the back-light circuit that requires micro-soldering repair using the proper diagnostic and soldering tools, and of course proper experience.

To confirm that your screen is not itself damaged, try another known good screen on your dim phone (or the dim screen on another known good phone, but those exposed contact points may cause the same board damage to the other phone).

MOST IMPORTANT: make sure you power down the phone then disconnect the battery before performing any kind of screen swap.

If you confirm that the screen is working fine except on your phone, your local independent repair shop (not an Apple Store, they don't offer this service) may be able to repair it for you if they are experienced in micro soldering. Or they have it outsourced to a specialized micro soldering technician. You can find a list of those on a link on my profile. Most if not all of them accept mail-in repair.

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it looks like you may have a faulty backlight, either ask for a replacement, or seeif the backlight is connected properly

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how do i check that? can't find anything online

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I just installed another digitizer. still no brightness control. tested my old screen where the brightness was working, and thats not working now. what can it possibly be if its not the digitizer or backlight? please help !!

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Good luck getting a replacement motherboard very hard to get

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Hi I have the same problem I start changing the LCD Screen without turning off the phone and now the brightness slider works but not back light I can move the slider from one side to the other and if I switch to auto slider in dark room it will go to the left side like there is a lot of light. I will try with another LCD screen to see what happens any Ideas thank you

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I have a similar problem, except I can't turn down my brightness and its chewing up my battery life like no tomorrow.

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AXX XXA will be eternally grateful.
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