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New screen assembly replacement part on an iphone 6plus has only 3 cables to plug in. Originally there were 4 total. Seem to be missing a cable. Do i use the old one somehow? Do i have the wrong part? Guidance please. i purchased this replacement part: iPhone 6s Plus Screen and used this guide: iPhone 6 Plus Screen Replacement
Missing cable you’re probably referring to is the flat for front camera, earpiece, proximity sensor, etc.. Unless you purchased a full assembly including everything, you’ll have to transfer that part from the older screen. If you’re not familiar with screen replacement it would be a good idea to go through this guide before starting your repair iPhone 6 Plus Screen Replacement