The two flex cables are microsoldered to the display backlight and connect to the display daughter board. Replace the two defective left or right display backlight flex cable to keep your 2016 to 2019 model with Retina Display happy and healthy.

Tested: Fully Function, Working 100%
Identifying Numbers：821-01270-01, 821-00603-03, 821-00517-05, 821-00516-03 ,821-01229-A, 821-01228-A.
Package:
1 - Right LCD Backlight Cable
1 - Left LCD Backlight Cable
Compatible Models:
-Compatible with MacBook Pro 15" Touch Bar Late 2016 A1707 (EMC 3072
MacBookPro13,3 Late 2016: MLH32LL/A , MLW72LL/A , MLH42LL/A , MLW82LL/A or BTO/CTO
-Compatible with MacBook Pro 15" Touch Bar 2017 A1707 (EMC 3162)
MacBookPro14,3 Mid 2017: MPTR2LL/A , MPTU2LL/A , MPTT2LL/A , MPTV2LL/A or BTO/CTO
-Compatible with MacBook Pro 13" Touch Bar 2016 A1706 (EMC 3071)
MacBookPro13,2 Late 2016: MLH12LL/A (2.9 GHz Core i5),(3.1 GHz Core i5) or (3.3 GHz Core i7)
-Compatible with MacBook Pro 13" Touch Bar 2017 A1706 (EMC 3163)
MacBookPro14,2 Mid 2017: MPXV2LL/A (3.1 GHz Core i5), (3.3 GHz Core i5) or (3.5 GHz Core i7)
-Compatible with MacBook Pro 13" Function Keys Late 2016 A1708 (EMC 2978)
MacBookPro13,1 Late 2016: MLL42LL/A or BTO/CTO
-Compatible with MacBook Pro 13" Function Keys 2017 A1708 (EMC 3164)
MacBookPro14,1 Mid 2017: MPXQ2LL/A, MPXR2LL/A, MPXT2LL/A, MPXU2LL/ or BTO/CTO
-Compatible with MacBook Pro 15" Touch Bar 2018 A1990 (EMC 3215)
MacBookPro15,1 2018: MR932LL/A , MR962LL/A , MR942LL/A , MR972LL/A or BTO/CTO
-Compatible with MacBook Pro 15" Touch Bar 2019 A1990 (EMC 3359)
MacBookPro15,1 2019: MV902LL/A , MV922LL/A , MV912LL/A , MV932LL/A or BTO
MacBookPro15,3 2019: BTO
-Compatible with MacBook Pro 13" Touch Bar 2018 A1989 (EMC 3214)
MacBookPro15,2 Mid 2018: MR9Q2LL/A or MR9U2LL/A or MR9R2