How can I fix my LXI 304-44700000?

I have an LXI model # 304-44700000 tv/vcr combo. I purchased a Philips universal remote to program for a lost original remote. None of the given codes operate the unit. (4 digit codes) Tried all codes 0000-0350. theyre are also 4 codes that are offered in the 1700's, none work. Is there another remote that will operate this unit, do I need to go to a 3 digit code remote?? Please help. Thank you