iphone 6 backlight issue - GSM-Forum

Pallle · 03-16-2017, 16:58

Hello

iphone 6 no backlight.
I replaced:
U1502 (3 times)
D1501
L1503
U1501
Filters OK.
but still problem.
BL_ANODE: 4.2V (without LCD) and 20V (with LCD)
BL_CAT1: 0.3V (without LCD) and 0.0V (with LCD)
BL_CAT2: 0.3V (without LCD) and 0.0V (with LCD)

Thanks for your reply.

HDccam · 03-16-2017, 19:46

I had the same problem, in my case it was C1505 shorted to ground. After removing, The backlight came alive. you might also check C1531 and C1530 if shorted to ground.

Pallle · 03-16-2017, 20:25

Thank you for your reply.
I had already removed C1530 and C1531.
I will remove C1505 and post what happen.

Albelektronik · 04-04-2017, 17:11

So what happen pallle

1- You repair was successfull
2- You go in holidays

3- You forget to post an answer :P

Cheers bro

Let us know.

Pallle · 04-04-2017, 20:18

This phone is left without backlight. Back to the client.
This was so far the only one that failed.

Albelektronik · 04-06-2017, 08:11

The same, i got during the week 2 cases not resolved changing Caps, coil, diode, IC after no short at all, filters and tracks OK, i have repaired 4 pcs all successful...

Sent from my iPhone using Tapatalk Pro

7899 · 04-06-2017, 12:01

Quote:

Originally Posted by Pallle

Hello

iphone 6 no backlight.
I replaced:
U1502 (3 times)
D1501
L1503
U1501
Filters OK.
but still problem.
BL_ANODE: 4.2V (without LCD) and 20V (with LCD)
BL_CAT1: 0.3V (without LCD) and 0.0V (with LCD)
BL_CAT2: 0.3V (without LCD) and 0.0V (with LCD)

Thanks for your reply.

bro check PP1V8_SDRAM
and PP_VCC_MAIN
under u1501

beling · 04-28-2017, 16:09

Quote:

Originally Posted by 7899

bro check PP1V8_SDRAM
and PP_VCC_MAIN
under u1501

hi
Can you show me how do you check them please ?
i have already change coil, diode, filters ic and check all tracks but without success.
when i solder U1502 i have these caps which are shorted C1597 C1552 but when i desolder it they are not shorted.

i think i have a problem with PP1V8_SDRAM

beling · 06-14-2017, 13:42

any ideas or suggestions ?

03-16-2017, 16:58	#1 (permalink)
Pallle Freak Poster Join Date: Jan 2016 Location: Hungary Posts: 362 Member: 2515187 Status: Offline Thanks Meter: 114	iphone 6 backlight issue Hello iphone 6 no backlight. I replaced: U1502 (3 times) D1501 L1503 U1501 Filters OK. but still problem. BL_ANODE: 4.2V (without LCD) and 20V (with LCD) BL_CAT1: 0.3V (without LCD) and 0.0V (with LCD) BL_CAT2: 0.3V (without LCD) and 0.0V (with LCD) Thanks for your reply.

03-16-2017, 19:46	#2 (permalink)
HDccam No Life Poster Join Date: Mar 2012 Location: Amsterdam, Netherlands Posts: 754 Member: 1732818 Status: Offline Thanks Meter: 532	I had the same problem, in my case it was C1505 shorted to ground. After removing, The backlight came alive. you might also check C1531 and C1530 if shorted to ground.

03-16-2017, 20:25	#3 (permalink)
Pallle Freak Poster Join Date: Jan 2016 Location: Hungary Posts: 362 Member: 2515187 Status: Offline Thanks Meter: 114	Thank you for your reply. I had already removed C1530 and C1531. I will remove C1505 and post what happen.

04-04-2017, 17:11	#4 (permalink)
Albelektronik No Life Poster Join Date: Sep 2005 Location: London, UK Posts: 694 Member: 178513 Status: Offline Thanks Meter: 109	So what happen pallle 1- You repair was successfull 2- You go in holidays 3- You forget to post an answer :P Cheers bro Let us know.

04-04-2017, 20:18	#5 (permalink)
Pallle Freak Poster Join Date: Jan 2016 Location: Hungary Posts: 362 Member: 2515187 Status: Offline Thanks Meter: 114	This phone is left without backlight. Back to the client. This was so far the only one that failed.

04-06-2017, 08:11	#6 (permalink)
Albelektronik No Life Poster Join Date: Sep 2005 Location: London, UK Posts: 694 Member: 178513 Status: Offline Thanks Meter: 109	The same, i got during the week 2 cases not resolved changing Caps, coil, diode, IC after no short at all, filters and tracks OK, i have repaired 4 pcs all successful... Sent from my iPhone using Tapatalk Pro

06-14-2017, 13:42	#9 (permalink)
beling Freak Poster Join Date: Jan 2004 Location: FRANCE Age: 36 Posts: 216 Member: 49046 Status: Offline Thanks Meter: 25	any ideas or suggestions ?