Given the "age" of the TV, it is very doubtful that they used a proprietary code set. There are a couple of IC manufacturers that make the devices used in the remote controls; the days of "roll your own" are over. A "universal" remote will in all likelihood work. If not, a quick search on eBay produced a bunch of hits for remotes for this TV; it seemed most around $30. There seemed to be many remotes pictured so you'll have to dig around and match up the pictures.
As for the remote itself (and things made the same way, calculators, etc.) I've revived more of these than I care to think about. They are usually made as a single sided PCB on paper phenolic with some copper traces and conductive carbon ink over the top of the copper traces insulated with "paint". The first thing you want (besides the obvious mini set of screwdrivers) is a "Prismacolor Magic Rub Vinyl White Eraser" available at any office supply store for $1.00. This is indispensable for "fixing" just about any contact surface there is. I've "fixed" SIM cards, USB thumb drives, SD cards, etc. ad nauseum with this thing.
When you get the remote open, check around the battery contacts first for a broken PCB trace to the battery contacts. Careful soldering or conductive epoxy will fix this. Also check arond the LED for the same thing. Second, remove the conductive rubber pad and "erase" all the interdigitated fingers with the eraser. Over time the contacts will develop a thin film that prevents good conductivity. They may "look" clean but you will notice the difference immediately. Do the same with the small black pads inside each of the rubber "buttons". If it is one of the really cheap constructions there may be separate metal dome switch's held on with scotch tape. These can be lifted and the board cleaned as well. Tedious, but it can be done.
I can't overstress the usefulness of this particular eraser. I've "saved" phones, cameras, "dead" memory cards simply by "erasing" the contacts. I have a bunch of these on my bench, desk, kitchen drawers...
This is another example of the belief I have that current products (not just electronics, but many others) are not built to be repaired, but replaced and cycled out every couple of years. I think that's just the way things are these days with how rapidly innovation evolves. It's frustrating, but true.
I agree with tekochip, That now a days technology is changing so rapidly that if certain issue comes in any of your electronic gadget either it becomes useless or you have to spend same amount of money to get it repaired .However you should try some universal remote maybe it works with your model and you be the lucky one .
It's becoming quite common and irritating, too. Many consumer devices no longer have as much as a power button on the device itself because everything is now controlled from the remote. The manufacturers may say it's for a sleek, clean look, but it's really to make the unit cheaper.
William, Anand is correct. The thing is too old in terms of our modern consumer product cycle. On the other hand, you might look at universal remotes that can mimic other brands. We even had one from one manufacturer that was programmable, even though it came with a particular set. There are also hobbist kits for microcontrollers that you might play with, if you are so inclined.
The representative said they don't sell a replacement remote for that model, since by now it is almost three years old, and also they changed the codes... or something.
In today's world, consumer electronics is rapidly developing. Every year, new product like TV, digital camers, camcorders, etc will be launced in market. The issue of replacemnt model not available is very common. After 2-3years of launch you will not get the replacemt products.
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