iphone 6s backlight problem - GSM-Forum

condenser · 08-31-2016, 18:08

Hi!

I have here one i6s with no backlight, when i opened it i found that D4020 and D4021 was burnt and (as you can see from the photo) the solder pads on the pcb are damaged because of the burning.

is it possible to repair that in your opinion?

thanks!

Kradziej · 08-31-2016, 20:42

if you can dig some copper under protective mask then why not but its very precise work to do
check cathode side of these diodes first because probably one of the boost converter output caps are shorted (c4022, c4023) or maybe even ic, check caps first

gkhn · 08-31-2016, 21:36

Very easy job.

Look at my pic, and use some wires to make the connection on the missing pad size

janzir · 09-01-2016, 07:19

Quote:

Originally Posted by gkhn

Very easy job.

Look at my pic, and use some wires to make the connection on the missing pad size

100% correct, i already done it

What software are you using to draw these lines on schematics? Pads? Allegro?

Sent from my iPhone using Tapatalk

condenser · 09-01-2016, 10:37

thanks to everyone, working now!

gkhn · 09-01-2016, 20:01

I found this on web, but you can find a pic like this and look at schematic and make your own colors in paint, yeah paint

gkhn · 09-01-2016, 20:02

Remember to thanks if you found it usefull

reparatieplus · 10-01-2016, 11:27

Hi,

iPhone 6s backlight doesn't work. where to start to measure? FL4211, FL4212, and see if it beeps? then go under the shield to check doide's? Thanks

08-31-2016, 18:08	#1 (permalink)
condenser Freak Poster Join Date: Dec 2013 Location: Veneto Posts: 144 Member: 2077335 Status: Offline Thanks Meter: 11	iphone 6s backlight problem Hi! I have here one i6s with no backlight, when i opened it i found that D4020 and D4021 was burnt and (as you can see from the photo) the solder pads on the pcb are damaged because of the burning. is it possible to repair that in your opinion? thanks!

08-31-2016, 21:36	#3 (permalink)
gkhn Major Poster Join Date: Jan 2010 Location: Europe Posts: 42 Member: 1208225 Status: Offline Thanks Meter: 13	easy Very easy job. Look at my pic, and use some wires to make the connection on the missing pad size

08-31-2016, 20:42	#2 (permalink)
Kradziej Freak Poster Join Date: Sep 2015 Posts: 198 Member: 2453408 Status: Offline Thanks Meter: 63	if you can dig some copper under protective mask then why not but its very precise work to do check cathode side of these diodes first because probably one of the boost converter output caps are shorted (c4022, c4023) or maybe even ic, check caps first

09-01-2016, 10:37	#5 (permalink)
condenser Freak Poster Join Date: Dec 2013 Location: Veneto Posts: 144 Member: 2077335 Status: Offline Thanks Meter: 11	thanks to everyone, working now!

09-01-2016, 20:01	#6 (permalink)
gkhn Major Poster Join Date: Jan 2010 Location: Europe Posts: 42 Member: 1208225 Status: Offline Thanks Meter: 13	I found this on web, but you can find a pic like this and look at schematic and make your own colors in paint, yeah paint

09-01-2016, 20:02	#7 (permalink)
gkhn Major Poster Join Date: Jan 2010 Location: Europe Posts: 42 Member: 1208225 Status: Offline Thanks Meter: 13	Remember to thanks if you found it usefull

10-01-2016, 11:27	#8 (permalink)
reparatieplus Junior Member Join Date: Oct 2011 Posts: 22 Member: 1665307 Status: Offline Thanks Meter: 3	Hi, iPhone 6s backlight doesn't work. where to start to measure? FL4211, FL4212, and see if it beeps? then go under the shield to check doide's? Thanks