This post will be updated as announcements come out for start times for 9/23 from the twelve day selection process that most TV networks adhere to. Please understand that games can be held until next Sunday if a broadcaster wants to wait on the results of the Week Three games. Most conferences have the possibility of having all or part of their games held for a six day hold of the start time.
Here's what I guessed based on the available openings (they'll prove to be incorrect) and here is the current schedule for the week as several FBS games do have their time & television/webcast assignments already accounted for.
All times Eastern.
SEC (7pm ESPN2 or 7:30pm ESPNU/SEC Network)
Florida at Kentucky, Syracuse at LSU & Auburn at Missouri
12pm ABC/ESPN2: Texas Tech at Houston
12pm ABC/ESPN2: NC State at Florida St.
12pm ESPN: Arkansas vs. Texas A&M
12pm ESPNU: West Virginia at Kansas
12pm CBSSN: Army at Tulane
12pm SECN: Massachusetts at Tennessee
12pm ACC RSNs: Kent St. at Louisville
12pm BTN: UNLV at Ohio St.
12:20pm ACC Network: Pittsburgh at Georgia Tech
1:30pm ESPN3: New Mexico at Tulsa
2pm ACC Network Extra: Old Dominion at Virginia Tech
2pm ESPN3: Ohio at Eastern Michigan
2pm ESPN3: Idaho at South Alabama
3pm FS1: UCF at Maryland
3:30pm CBS: Alabama at Vanderbilt
3:30pm ABC/ESPN/ESPN2: USC at California
3:30pm ABC/ESPN/ESPN2: TCU at Oklahoma St.
3:30pm ABC/ESPN/ESPN2: Boston College at Clemson
3:30pm ESPNU: Duke at North Carolina
3:30pm SECN: Louisiana Tech at South Carolina
3:30pm BTN: Georgia Southern at Indiana
3:30pm BTN: Rutgers at Nebraska
3:30pm ACC RSNs: Toledo at Miami (FL)
3:30pm ESPN3: Miami (OH) at Central Michigan
3:30pm ESPN3: Wake Forest at Appalachian St.
4pm FOX: Michigan at Purdue
5pm ESPN3: UL-Monroe at UL-Lafayette
6pm Pac-12: Nevada at Washington St.
6pm ESPN3: Akron at Troy
6:30pm FS1: Oklahoma at Baylor
6:30pm ESPN3: Western Illinois at Coastal Carolina
7pm ESPN: Mississippi St. at Georgia
7pm ESPN3: FAU at Buffalo
7pm ESPN3: Wagner at Western Michigan
7:30pm ABC: Penn St. at Iowa
7:30pm ESPN3: UTSA at Texas St.
8pm ESPN3: UTEP at New Mexico St.
10pm FS1: Washington at Colorado
10pm Pac-12: Oregon at Arizona St.
10:15pm ESPN2: Hawai'i at Wyoming