Ask for this book from your local technical bookstore.
For a technical reference on the various flavours of NTSC, PAL, and SECAM used around the world, I suggest:
Available from Omnicom, 115 Park St. S.E. Vienna, VA 22180 (703)281-1135
The following book is for PAL TV-standard specifications:
It has three heavyweight chapters describing NTSC/PAL/SECAM and has a decent amount of math content.
The following is more directed toward digital video but may still contain some information useful for understanding analog TV technology:
There don't seem to be nearly as many TV repair books for modern solid state TVs as I recall for old tube sets. Here are a couple which you may find (or its predecessor) at your local public library (621.384 if you library is numbered that way) or a technical book store. MCM Electronics has the Davidson as well.
(Recommended by: Larry Sabo (firstname.lastname@example.org).)
(Recommended by: Michael Caplan (email@example.com) who has the following comments.)
There are three editions, the first going back to 1979. I've used both the second (1985) and third (1993) editions (ISBN 0-13-150012-0). The latter incorporates more digital circuitry and virtually no tube systems. The second has somewhat more tube-based information, but still focuses on semiconductor circuits. The first edition, I understand, had far more tube system detail.
The following is a recent publication:
From the advertising blurb for this book:
"This book, 300 pages of detailed photos, schematic diagrams, and text explains in easy to understand language how TV works, how to troubleshoot problems, and advice on how to fix them. The Howard W. Sams Troubleshooting and Repair Guide to TV is the perfect reference book for technicians, instructional guide for students and hobbyists."