Facing TV Problems? Ask a TV Technician.
Hi and welcome to the site, I’m Louie as requested the second opinion. Sorry you had to wait awhile but I’ll do my best to help.
Initially, are you able to return and have the new lamp replaced by the seleer?
This is the easiest.
This would serve as both an attempt of a fix and as a test by process of elimination.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter (and even perhaps a soldering iron)?