From what I heard the tiny text issues isn't because of your tv or even the PS3. Some developers don't test out their games a lot on SDTV's and only test extensively on HDTV's. So usually this makes minor issues like very small text on SDTV's coming through.
Dead Rising on the 360 was the same way, it was developed mostly on HDTV's and not on the other, so the text in the game even on my 27 inch SDTV is very hard to read.
So it's kind of an issue us SDTV owners have to deal with. This issue doesn't pop up much though since most developers also keep SDTV set ups in mind.
So keep in mind that I'm not 100% sure it's the problem but it's the most plausible.
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