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Released September 22, 2017. Model A1864, A1897. Available as GSM or CDMA / 64 or 256 GB / gold, silver, and space gray.

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iPhone 8 plus. image but has no backlight.

iPhone 8 plus has image but has no backlight.

I have checked all 1.8v lines and all 5.7v lines which are present on the fpc. all backlight filters check out fine.

I replaced all 3 backlight coils, both backlight driver ics. still no backlight.

im getting very low voltage readings on both anode lines ( 3.7v ) .

my anode readings taken from a good working board im getting around 10v on one anode line and around 16v on other anode line. with screen connected.


However on this one both backlight anode lines measure (3.7v) on both anode lines with screen connected.

anyone know what would cause both anode lines to be only pushing out 3.7v instead of the normal 10- 16v?

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Voltage boost circuit component gone bye-bye? The following might offer some clue:

https://www.youtube.com/watch?v=wv96of7S...

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Blacklight Diode O/C

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Assuming the replacement parts are in working order and that there are no issues with the work itself, I would consider looking at the DISPLAY_TO_CHESTNUT_PWR_EN line and related Display Control Signals. They are the ones that tell the backlight driver to power up the anode line.

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thanks Minho, which related Display Control Signals should would u suggest I check. as im getting display to chestnut voltage. all tested with screen connected.

pp1v8 display con = 1.8v

pp5v7 display adds = 5.7v

display to chestnut power enable = 1.7v

i2c disp eprom sda = 1.7v

ap to display reset = 1.7v

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Can you please send me the diagram of these lines

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J'ai exactement le même problème mais uniquement sur l'anode BL12 (4V) l'anode BL34 est bonne (10V) si quelqu'un a une solution

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joey crwdns2893898:0crwdne2893898:0
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