How to repair iPhone 7 Black Screen - GSM-Forum

Serio hou · 10-22-2018, 07:25

How to repair iPhone 7 Black Screen

iPhone 7 boot with no display, but the boot is current normal. if Screen replacing also cannot solve the problem,We can draw the conclusion that the logic board backlight circuit broke down.We provide some repair methods

K.I.K · 11-02-2018, 13:13

Check LF3802 and LF3803

pes · 11-21-2018, 14:03

Solved,
Thanks to helpful,

Amanda0820 · 12-06-2018, 08:19

There have some steps about to repair iPhone 7 black screen as following:

Step 1:
Take out the logic board. The test grounding resistance value of J4502 – normal value. Which shows that backlight circuit is also normal. Yet backlight signal is connected directly with backlight IC U3701.

Step 2:
Apply some BGA Paste Flux, take down the backlight IC with Hot Air Gun at 320 degrees.

Step 3:
Clean the tins with Soldering Iron and then clean again with PCB Cleaner

Step 4:
Apply some BGA Paste Flux. Align the backlight IC to the right place and solder it with Hot Air Gun at 320 degrees.

Step 5:
Once the logic board is cooling enough, clean it with PCB Cleaner.

Step 6:
Assemble the phone and test. The phone boots normally with screen display—fault cleared

Nodir.tashkent · 12-20-2018, 11:19

good one bro, will try and report back.

kgnaccessories · 12-28-2018, 16:58

thanks for helping this is very helpful

10-22-2018, 07:25	#1 (permalink)
Serio hou Junior Member Join Date: Aug 2018 Posts: 32 Member: 2857683 Status: Offline Thanks Meter: 9	How to repair iPhone 7 Black Screen How to repair iPhone 7 Black Screen iPhone 7 boot with no display, but the boot is current normal. if Screen replacing also cannot solve the problem,We can draw the conclusion that the logic board backlight circuit broke down.We provide some repair methods

11-02-2018, 13:13	#2 (permalink)
K.I.K Registered User Join Date: Jun 2009 Location: Philiphines Posts: 139 Member: 1048859 Status: Offline Thanks Meter: 72	Check LF3802 and LF3803

11-21-2018, 14:03	#3 (permalink)
pes Freak Poster Join Date: May 2004 Location: Macedonia Age: 54 Posts: 182 Member: 65593 Status: Offline Thanks Meter: 17	Solved, Thanks to helpful,

12-06-2018, 08:19	#4 (permalink)
Amanda0820 Freak Poster Join Date: Aug 2018 Location: China Posts: 158 Member: 2861866 Status: Offline Thanks Meter: 71	There have some steps about to repair iPhone 7 black screen as following: Step 1: Take out the logic board. The test grounding resistance value of J4502 – normal value. Which shows that backlight circuit is also normal. Yet backlight signal is connected directly with backlight IC U3701. Step 2: Apply some BGA Paste Flux, take down the backlight IC with Hot Air Gun at 320 degrees. Step 3: Clean the tins with Soldering Iron and then clean again with PCB Cleaner Step 4: Apply some BGA Paste Flux. Align the backlight IC to the right place and solder it with Hot Air Gun at 320 degrees. Step 5: Once the logic board is cooling enough, clean it with PCB Cleaner. Step 6: Assemble the phone and test. The phone boots normally with screen display—fault cleared

12-20-2018, 11:19	#5 (permalink)
Nodir.tashkent Junior Member Join Date: Oct 2015 Posts: 17 Member: 2478671 Status: Offline Sonork: 1669912 Thanks Meter: 3	good one bro, will try and report back.

12-28-2018, 16:58	#6 (permalink)
kgnaccessories Junior Member Join Date: Dec 2018 Posts: 9 Member: 2885508 Status: Offline Thanks Meter: 1	thanks for helping this is very helpful