Iphone 6 backlight - GSM-Forum

Mat0u25 · 10-17-2017, 22:08

Hi,

I have an IPhone 6 with no backlight

D1501 was burn and coil L1503 was crack
I find C1530 was short to ground.
I replace diode,coil and caps but no backlight
Filters is ok

I change IC U1502
no backlight

i test voltage:
PP_LCM_BL_ANODE 3.8V ???
PP_LCM_BL_CAT1 0.6v
PP_LCM_BL_CAT2 0.6v

One more thing ground U1502 pads was missing so il recreate it.

who have an idea?

thanks

Pallle · 10-17-2017, 22:14

Hello

Are you tried with other display?

Mat0u25 · 10-17-2017, 22:22

yes i try a know good display

what do you think about PP_LCM_BL_ANODE 3.8V ???

U1502 PB?

Pallle · 10-17-2017, 22:38

3.8V is ok without display.
With display around 15-20V.
I think try replace U1502 again.

sunny_lad · 10-19-2017, 00:09

Try and make a jumper directly from the cap to that side of the filter which is on the connectors side.

Sent from my ONEPLUS A3003 using Tapatalk

milek12 · 10-19-2017, 07:10

Here is how I resolved the matter it should work for you as well

Mat0u25 · 10-21-2017, 20:09

I reball and replace U1502, backlight work now
thanks guys

10-17-2017, 22:08	#1 (permalink)
Mat0u25 Junior Member Join Date: Aug 2017 Location: Marseille Posts: 25 Member: 2745346 Status: Offline Thanks Meter: 1	Iphone 6 backlight Hi, I have an IPhone 6 with no backlight D1501 was burn and coil L1503 was crack I find C1530 was short to ground. I replace diode,coil and caps but no backlight Filters is ok I change IC U1502 no backlight i test voltage: PP_LCM_BL_ANODE 3.8V ??? PP_LCM_BL_CAT1 0.6v PP_LCM_BL_CAT2 0.6v One more thing ground U1502 pads was missing so il recreate it. who have an idea? thanks

10-17-2017, 22:14	#2 (permalink)
Pallle Freak Poster Join Date: Jan 2016 Location: Hungary Posts: 362 Member: 2515187 Status: Offline Thanks Meter: 114	Hello Are you tried with other display?

10-17-2017, 22:22	#3 (permalink)
Mat0u25 Junior Member Join Date: Aug 2017 Location: Marseille Posts: 25 Member: 2745346 Status: Offline Thanks Meter: 1	yes i try a know good display what do you think about PP_LCM_BL_ANODE 3.8V ??? U1502 PB?

10-17-2017, 22:38	#4 (permalink)
Pallle Freak Poster Join Date: Jan 2016 Location: Hungary Posts: 362 Member: 2515187 Status: Offline Thanks Meter: 114	3.8V is ok without display. With display around 15-20V. I think try replace U1502 again.

10-19-2017, 00:09	#5 (permalink)
sunny_lad Insane Poster Join Date: Jan 2014 Posts: 87 Member: 2110834 Status: Offline Thanks Meter: 9	Try and make a jumper directly from the cap to that side of the filter which is on the connectors side. Sent from my ONEPLUS A3003 using Tapatalk

10-19-2017, 07:10	#6 (permalink)
milek12 Freak Poster Join Date: Aug 2017 Posts: 131 Member: 2748073 Status: Offline Thanks Meter: 8	Here is how I resolved the matter it should work for you as well

10-21-2017, 20:09	#7 (permalink)
Mat0u25 Junior Member Join Date: Aug 2017 Location: Marseille Posts: 25 Member: 2745346 Status: Offline Thanks Meter: 1	I reball and replace U1502, backlight work now thanks guys