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Reload this Page iPhone 6S No backlight
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Old 10-19-2017, 20:35   #1 (permalink)
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iPhone 6S No backlight

Hi

I have an iPhone 6S (water damage, no signs of corrosion, but indicator is red) with a backlight problem.

I checked:
FL4211; FL4212; FL4213, all OK
Diode D4020 replaced (with iPhone 5 one, but seems to be similar?)

Without screen I measure about 3.5V on FL4211 and at one side of the diode (towards U4020)

I am not getting any voltage at FL4212, is U4020 defective? Or is there an other problem?

During the measurements, no screen was attached.
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Old 10-19-2017, 21:21   #2 (permalink)
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test fl4205 if no deflection,change or jumper
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Old 10-19-2017, 21:40   #3 (permalink)
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Hello

Common problem on iPhpne 6s backlight the coil. Tra replace L4020.
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Old 10-19-2017, 21:42   #4 (permalink)
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Quote:
Originally Posted by tochits View Post
test fl4205 if no deflection,change or jumper
I checked it, 0.0ohm, so seems to be OK.

Also with the screen connected I only get 3.4V (measured at the diode, see picture attached) Is it the coil ?
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Old 10-19-2017, 21:46   #5 (permalink)
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D4021 hasn't been replaced, anyway to check if that one fails? Doesn't seems to fail since I get the 3.4V also at C4023 and FL4211
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Old 10-19-2017, 21:49   #6 (permalink)
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Quote:
Originally Posted by iphonerepair12 View Post
Hi

I have an iPhone 6S (water damage, no signs of corrosion, but indicator is red) with a backlight problem.

I checked:
FL4211; FL4212; FL4213, all OK
Diode D4020 replaced (with iPhone 5 one, but seems to be similar?)

Without screen I measure about 3.5V on FL4211 and at one side of the diode (towards U4020)

I am not getting any voltage at FL4212, is U4020 defective? Or is there an other problem?

During the measurements, no screen was attached.
send me your mail box i will forward the diagram for you i have tried to upload it is give me error or you can go to this link you will find the diagram there
http://s22.postimg.org/ool6ajy4x/i_P...t_solution.jpg
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Old 10-19-2017, 21:51   #7 (permalink)
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Quote:
Originally Posted by freekytech View Post
send me your mail box i will forward the diagram for you i have tried to upload it is give me error or you can go to this link you will find the diagram there
http://s22.postimg.org/ool6ajy4x/i_P...t_solution.jpg
Already checked those filters, they are OK (0.0ohm)
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Old 10-19-2017, 22:10   #8 (permalink)
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Quote:
Originally Posted by iphonerepair12 View Post
Already checked those filters, they are OK (0.0ohm)
when you said 0.00ohm did you set the meter to continuity and it made a beep sound when you where taking your reading?
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Old 10-19-2017, 22:15   #9 (permalink)
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also watch this video it could help resolve your problem with the phone

https://*********/xIPIxZAfijM
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Old 10-19-2017, 22:18   #10 (permalink)
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Originally Posted by iphonerepair12 View Post
Already checked those filters, they are OK (0.0ohm)
watch this video it will help you solve your problem https://*********/xIPIxZAfijM
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Old 10-19-2017, 22:30   #11 (permalink)
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Removed l4020 (broken during removal), I measured no short on those pads, now waiting for the new coil.

Is it possible to replace it with a coil from an iPhone 5 ?

Verstuurd vanaf mijn ONEPLUS A3003 met Tapatalk
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Old 10-19-2017, 22:35   #12 (permalink)
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Not the same value the coil with the iphone 5.
Same with the 6 and 6plus.
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Old 10-19-2017, 22:40   #13 (permalink)
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What value (Voltage) should I measure on the pads of the coil, when it is removed ?

Verstuurd vanaf mijn ONEPLUS A3003 met Tapatalk
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Old 10-19-2017, 22:51   #14 (permalink)
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PIN1 you measure PP_VCC_MAIN.
PIN2 0V.
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Old 10-22-2017, 19:25   #15 (permalink)
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Check coil


Sent from my iPhone using Tapatalk Pro
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