Sixth iteration of Apple iPhone, announced on September 12, 2012. Repair of this device is similar to the previous models, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Black or White.

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Replaced Screen now working but very Dim any ideas please?

Hi All can you help please I've looked at related questions but cant see any answered. I replaced a Screen/lcd on my iPhone 5 but its now very dim, could I have damaged anything? I was very careful. I have cleaned connections and re connected several times but no different. I have also tried another screen still no use please can anyone help me thank you. I repair phones for Charity in the UK but this ones mine HUH!!!

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Try 1# All u need to do change back light from u old screen ! To the new lcd

Try 2# May be back light in u logic board

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Backlight circuit troubleshooting needed. The cheap screens have an exposed backlight solder joint on the flex. Closing up the phone can short the backlight circuit to ground. It blows a backlight filter/fuse and this is usually the extent of it. REPAIRABLE--find the dead filter and replace it. The backlight circuit is pretty straightforward. Feel free to contact me if you need a mail-in board level repair like this to get your screen replacement back on track.

Jessa

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That's why I stock my own screens, although they cost me more than what the local resellers would sell me theirs by the piece...

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Jessabethany- can you fix this for me? How much?

Thank you

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yes of course--click my picture to find your way to my mail-in repair business: iPad Rehab.

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Is there anyway we can get in contact i have a similar problem if so email me sabrinapolycarpe@gmail.com

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How much would it cost to repair dead filter and replace if I mailed my phone to you??

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Are the LCD units you are using apple original or 3rd party replacements? as if they are replacements, they may not be good quality replacements. i'm assuming you've ensured the display settings are set to full brightness as well...

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All screens are third party replacements--Apple does not allow original screens to be available as replacement parts

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Slightly delayed reply, sorry jessabethany. i've not been on in a while. But that isn't true. The screens are available, just not as readily available as replacements.

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You can get high-quality replacement screens not made by Apple. The Apple marketing and hype machine is second to none! Gorilla glass and many other high quality parts are available outside of OEM.

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You can also get original screens. Apple offer repairs for cracked iPhone digitizers, so there are plenty being manufactured. You just need to know where to go. Because there are so many high quality replacements available on the market, its hard to weed through to get the original ones, but they are available, because thats all we source.

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Uh-Oh. Sounds like the cheap aftermarket screens might damage something in the iPhone circuitry. I have the same issue - put on a new 'cheap' screen and the phone worked really great for about 2 weeks. All of the sudden today, I have almost no brightness, and no response to brightness slider controls. I suppose it is possible that the new screen (back-light) has actually burned out the driver in whichever chip is responsible for back-light control, which may be a fatal failure. The phone is not very usable as is, except in pitch darkness.

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I did just update to iOS 7.0.6 yesterday, don't suppose that could have anything to do with it???

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I have researched this problem and found that it does indeed indicate that some hardware components may be bad. The following solution seems to be effective in most cases, but it requires very fine soldering skills:

http://www.cyberdocllc.us/shop/iphone-5-...

They sell the components mentioned as a kit on their website which consists of the coil, an 'IC' (really this is just a diode), and 3 'filters' (capacitors). They have an excruciatingly detailed video showing how to change these parts, but the right soldering equipment is essential. They also list this kit on Ebay - search for "iPhone 5 backlight coil".

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What they do not discuss is the actual backlight IC, which is an LM3534TMX backlight controller from Texas Instruments. I am looking for a source for these in low quantities, but I suspect most problems can be solved without changing that chip.

I hope this helps all of you suffering from this problem (and me too)! I'll let you know the outcome for me once I get the parts.

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Ah-Ha. Here is a link for the backlight controller integrated circuit:

http://www.parts4repair.com/12pin-lcd-ba...

Please vote 1 for me if this helps you!

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No!!!!! This is going to be a simple backlight filter. The cheap screens blow this filter all the time. DONT mess with the backlight ic chip (not the diode or coil either)

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This "MAYBE" a software issue and it's sort of a filter over your screen that won't permit full brightness, usually after installing iOS updates.

Here's how to fix it.

Go to Settings > General > Accessibility > Zoom > and DISABLE Zoom. Brightness returns.

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The issue may simply be caused by the light sensor. You can diagnose this by comparing the brightness of the Apple logo screen at startup and the lock screen.

If the Apple logo screen has a normal brightness compared to a dim lock screen then the issue is the light sensor.

To fix you simply need to remove and correctly seat the camera, speaker, and light sensor.

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Kevin will be eternally grateful.
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