The remote can be tested by any shop (a small laminated card sensitive to infra red will test it).
If you just want to replace it Google it with the CLU-413UI and you will find it for sale, I did and here is one I saw.
http://remotes.com/store/hitachi/clu413ui.html
You may also want to look on EBAY as there are usually ones for sale there. Most likely if your remote is defective is either it got dropped or something was spilled on it, Also make sure you hit TV on the remote first as most of these are multipurpose remotes(If something else is selected it will not work on the set).
Before you rate how helpful this information was let me know what you find and or if you have questions.
SD TECH
An after thought: Almost any good TV repair man can test the remote and open and fix it if it was not smashed etc, usually for less than a replacement remote.
I have customers come in all the time with some very expensive remotes and I take them apart, locate and repair the problem and put them back together for less than ten dollars.
The more you tell me the better I can help you, I am here to help.
SD TECH
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