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Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model numbers of the "...New remote...DVD/VCR...TV..."
Additionally, please describe how the DVD/VCR is connected to the TV using what kind of cable(s).
Appreciate the additional infoirmation.
Please confirm that the new remote is original that came with the Philips DVP3345V.
Would the Philips work as expected with the Sansui using the TV's side panel controls / buttons ?
Using the side control panel buttons would serve as a test. Please try.
There is a MENU button there.
Good luck and thank you too for the opportunity to share the information.