The third most common repair for us has been the iPhone 6S no backlight repair. What usually happens is that the customer decides to replace their own screen, forgets or decides not to disconnect the battery, and then as soon as the lcd/digitizer connector shorts itself across the pins, they see a puff of smoke from the logic board.
To confirm that the backlight is no longer working, disconnect the battery, reconnect it, then plug in a USB lightning cable. Immediately shine a bright light on the center the screen and you should be able to see a faint apple logo. That will confirm that there is a problem with the backlight system.
Why does the backlight blow so often? Well, the short story is that the screen is supplied a constant power even when it’s off because the touch IC chip is built directly onto the screen. Watch the video for more details:
On the iPhone 6 and 6+ and prior series iphones, when the screen is off, there is no power going to the screen. For the iPhone 6S and 6S Plus, the power is constant, regardless of whether the screen is on or off.
To fix the problem, the backlight filter (FL4211) needs to be replaced. This is the main power line that handles the 3.8V power to the screen.
You’ll need either a hot air rework station or some microtweezers. I don’t think a regular soldering iron will be small enough to do the job. Here’s a video of us repairing the burned out and broken filter:
If you can’t or don’t want to repair it, then let us do it for you! Fill out the quote request form and we’ll get right back to you. Usually backlight filter repairs are done within 24 hours after receiving the device.
I do some phone repairs buying and selling. I have 2 iphone 6 models with the no service searching issue and another iphone 6 with a blank screen after i did a battery change. Trying to get an estimate. Where are you located.
We don’t repair this problem.
Hey i got a iphone 6s who the backlight dont work after a screen change how mutch will it cost to fix this?
Please see for the price list here: https://www.microsoldering.com/request-a-quote/
I have an iPhone 6s with a backlight problem. The screen turns on with no light (I can barely see whats on the screen with bright light shined on it) but everything else still works on the phone. The touch screen works, apps work, it’s just the screen that’s really dim is what the problem is. Is this a filter that blew or is it the entire system?
99% of the time, it’s just the filter.
I replaced lcd of Iphone6s after installing new one half backlight on LCD took off and attach broken Lcd which was before one it but light was half on screen
I tested filters were good
Which part is the damaged
Please guide me
I just had a replacement screen put on my daughter’s iphone 6s. It worked fine for several hours. Having a low battery she placed it on the charger and left it for 30mins or so. When she came back, it was dark and we could barely see the Apple logo. When I took it back to the store I had it repaired at, they totally blew me off like she had to had dropped it again. Is it possible they actually did this by mistake and didn’t want to admit it? Or is it possible for it to go out for no reason?
It’s possible that it went out for no reason. Or it could possibly be the screen. Sometimes it’s even the charger that you use.
Hi,
I have an iphone 6s. sometime the lcd turns on other time its a black screen but you can still hear the sound turning on and off. Please advise.
Regards.
You’ll need to send it in.
Hi there. Where can find this backlight filter FL4211? I tried find 240-ohm 350ma filter from iPhone 6 donor board but I didn’t find any. Is there some filter in previous iPhone e that can be used?
i got that same problem eveyrhting works but you have to put a flashlight to see eveerything..filter you said? how much would that cost?? email me please cjconcepcion2017@icloud.com
Please see prices here: https://www.microsoldering.com/request-a-quote/
Hi
I have a backlight issue after a screen replacement. Mine is slightly different though. If the battery runs out on the phone and I press the power button the screen lights up with the ‘connect charger’ symbol. If I plug it in the battery symbol shows up fine, the screen looks perfect. Once the phone turns itself on the screen goes black. If i hit the power button the screen will flicker on for half a second then go black again. This is the only time it will flicker on and to recreate the effect I have to wait till the battery is dead again.
This is still clearly a backlight issue but with different symptoms. What would be your suggestion?
I have ordered an FL4211 filter anyway and plan to replace it using my SMD rework station but do you think it could be another issue?
check diode mode for the top six pins starting from the left and the three backlight pins to find your fault.
Thank you very much. Hugely appreciate the tip. Just to confirm, you’re referring to the pins on J4200?
Ok i have a qwestion sorry my englis is not my main
I have a blown fuse the uper 1 but the contact is also blown so i cant jump it and i wuld lime to k ow where can i jum it elswhere
Why is it called “no backlight” ? i have same issue but flashlight on the back is working. Only no screen. I unplugged first battery cable, and then screen cables but when i try to reconnect, i felt burn smoke for a second. After that i have this issue. Itunes recognize and i have sounds from phone, but no screen. So this is “no backlight” issue and need to reopair mainboard? Screen replacement won’t work?
Would I be able to send in my phone to have it repaired? The backlight is fried and if so how much would it cost
i have a iPhone 6s no display and no backlight the backlight filter seems to be good diode seems to be good and replaced the chestnut but number 3 pin on j4200 still reads open line and i do not have zxw because i have a mac computer so i can not trace where the power comes from i will be getting zxw as soon as i can get a windows lab top