Chosen Solution
OK folks. I asked a similar question and received the usual, “you did not do it right” responses. Here is the issue. When you replace the LCM on an iPhone 8, you lose the True Tone and auto-brightness features. Anyone else know about this or how to fix it?
iOS 12 solves this problem for the ALS (Ambient Light Sensor) auto-brightness (and probably true-tone as well) not working. iOS 11 is currently the latest public release so there is no fix for it software wise yet as iOS 12 is currently in beta. What causes this is that the little display chip on the screen is paired to the logic board via ID. Each screen has a different ID and if that does not match the ALS / True tone will not work. So what would need to be done is the display chip information must be copied from the original screen onto the replacement screen (original or aftermarket doesn’t matter) then it will work fine. Here is a link to what the product looks like: https://www.rewatechnology.com/alsambien… I wouldn’t buy it myself as it’s like a one-off thing.
Hello Shawn, It is very likely that the part you installed includes an aftermarket LCD, meaning the display element is from a different factory than your original display. Aftermarkets will typically have different color characteristics than the original. Inexpensive aftermarkets will never be very close. Some very expensive aftermarket parts are nearly identical to the original screen. Unfortunately only the Apple Store part, calibrated by Apple’s own equipment will be 100% accurate. As to the brightness issue, your ambient light sensor may be misaligned or the glass in front of the sensor be too transparent or too opaque. I recommend taking out the new screen assembly and comparing the old and new parts. The “hole” in front of sensor needs to match. If the glass color does not match, how you adjust the shading will be up to your own level of creativity. Adding successive layers of transperant tape to the glass may be a good start.
I believe that with the latest iOS 11 updates it is no longer possible to replace the screen, as auto-brightness and true tone will be disabled. I also heard that face-ID sometimes gets disabled.
hi guys all you have to do is , take that beautifull iphone 8 or 8 plus thats currently suffering from no true tone display feature in setting connect it to your computer or macbook put the iphone in itunes download mode im sure you know what i mean and click restore ios on your computer that has itunes oh yeah back your $@$* up first the once you restore the OS when setting up the phone you will even see the true tone display option as you set it up make sure before doing all of this you backup all the kaka on your phone and remove find my iphone and sign out then boom it will work like wonder bread
You must transfer eeprom off original screen from the phone to replacement screen which accepts the data. After market with copied IC will not take that data.
when You replace your screen you WILL lose the True Tone feature, it doesn’t matter if you use an Apple original display as a replacement… the original screen is the only screen with True Tone. I don’t know why your auto brightness doesn’t work, it should. Maybe you used a replacement camera assembly? I have a replacement oem Apple screen installed on my iPhone 8 and I do not have True Tone :(
How do you add eeprom?
There are two ways to really do this. You can either pay apple $600 to fix it. Or let’s say you are starting a repair company for iPhones. Then you could buy something like JC1000s or similar and use an application such as 3uTools to find the original screen’s serial number. Then you can burn it to your new screen with the JC Tutorial Video Here: https://bit.ly/jcifixit
I changed my ear speaker flex cable on my XS. I didn’t change my screen as it is still in new condition. The ear speaker cable was causing the “boot loop” mode, specifically the Illuminator sensor. New cable allowed the phone to power on however no True Tone or auto brightness now. Face ID obviously doesn’t work but that is already known. So copying the screen code won’t work because this is the screen that came from my phone originally. Seems like the new cable isn’t paired with the ambient light sensor either.
