> i have a 55" panasonic LCD. no apps or wifi.From 2003. Still works.

Most probably a plasma, not LCD. LCDs from that time had extremely bad colors.

If you're looking for an upgrade, try to find a Panasonic Viera VT/ST/GT50 or *60, but check for burn-in before you buy.

> I plug my laptop via HDMI and the possibilities are still there.

If the TV has HDMI CEC, then get yourself a RaspberryPi 4 (lowest memory model is enough) and LibreELEC. You'll thank me later.