This issue is caused by a faulty flex cable. The screen can still be used however.
There are some minor marks and signs of use. _gsrx_vers_841 GS 7.0.16 (841).The item "Apple MacBook Pro 13 Retina A1706 A1708 LCD Screen Lid Display Assembly READ" is in sale since Monday, May 3, 2021. This item is in the category "Computers/Tablets & Networking\Computer Components & Parts\Laptop Replacement Parts\Laptop Screens & LCD Panels". The seller is "owltechuk" and is located in London. This item can be shipped to United Kingdom, Antigua and barbuda, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, Bahrain, Canada, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Dominica, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Turks and caicos islands, Aruba, Saudi arabia, South africa, United arab emirates, Ukraine, Chile, Bahamas, Colombia, Costa rica, Guatemala, Honduras, Kuwait, Panama, Philippines, Qatar, Trinidad and tobago, Uruguay.