You're probably not going to build any sort of computer by using parts from a broken TV. Every IC, or microchip, that you see on any printed circuit board, performs a particular function. This is always true, regardless of the machine. If you take apart a DVD player, you're going to find circuitry and ICs which are put together in order to perform the specific task of reading information from a DVD, and passing that formatted information as signal that a TV can use. If you take apart a mircowave oven, you're going to find parts which are specifically designed to handle the task of producing, and controlling electromagnetic energy in order to heat things up. This isn't only true for electronics, but for any machine, including cars. Imagine if you dismantled a car's engine. The parts may be useful for building another engine, but not very useful for building something as different as a refrigerator. The same thing applies to electronic machines. Each part is designed for a specific purpose, though many of them look the same.
When it comes to electronic ICs (microchips), in most machines, ASICs are used. ASIC is an acronym for Application Specific Integrated Circuit. That means they're built for a specific application. ASICS are used in computers too, but they're still used with a specific purpose in mind; whether it be encoding/decoding signals from/to peripheral devices like mice, keyboards or monitors, or performing specific instructions of a programmer's program, as a CPU. Every chip is built with a specific purpose in mind. For this reason, you wouldn't be able to build a computer from a broken TV. The TV components are designed to ultimately handle display tasks, not general instructions from a programmer's program.
I admire your curiosity, but don't be tempted to figure that any electronics component can be programmed, or configured, to handle any task. Many electronics boards look very similar. However, depending on what they're designed for, one may never be suitable to perform the task of another. This is easier to recognize with mechanical parts, like trying to build a refrigerator out of a car engine, but the concept is exactly the same.
I did a quick search on your Zoran ZR39748BGCG microchip. It appears to be some sort of backlight LED circuit.http://www.iccfl.com/product_info.php?p ... hcc9va6u90
This isn't surprising since you found it in a TV.