Facing TV Problems? Ask a TV Technician.
Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially and based on "...sound but no picture ...", is the screen all blue, black or white ?
Thanks for allowing me time to review the repair/Service Manual and compose this reply.
This is a 1998 model and the parts are no longer readily available. Other than parts availability, the service fee would be a major concern depending on the going rate in your location if not considering a DIY (do-it-yourself) repair.
As a user / opinion - It would then appear to be to your advantage to evaluate other options considering cost of repair, down time, cost of shipping, age, parts availability and comparable prices of newer/better models; i.e. replace rather than repair.