Fatal Error (1999)?
A technological nightmare becomes a terrifying reality in this sci-fi-thriller. When a group of computer experts and executives from a high-tech firm based in Seattle die suddenly and unexpectedly during a conference call, Samantha Craig (Turner), a government agent who specializes in disease tracking, is brought in to investigate.
Craig finds herself having to work alongside Dr. Nick Baldwin (Sabato), a local physician trying to live down a professional disgrace, and together they make a shocking discovery: a deranged programmer named Ned Henderson (David Lewis) has developed a computer virus that has evolved from destroying databases into an organic virus that can claim human lives. But how would he be able to create such a contagion, and how can it be stopped?
It's the answer to this Yahoo thread which was likely searching for the same movie:
All I remember is two cops/FBI agents, one of whom may have been Lou Diamond Phillips or someone similar, trying to track down someone who created a TV signal that kills through a visual signal that causes human bodies to expel calcium through cell membranes and harden. Some victims fall over and shatter.
From the answer there, the resolution indeed consisted in stopping mass broadcasting:
Samantha and Nick must then prevent Digicron's box being sold to the general public in vast numbers, according to the company's Barnum-marketing starting in only two days, but CEO Teal refuses to believe them.
The "heartthrob Latino soap opera-esque actor" would be Antonio Sabàto Jr. who according to Wikipedia "first found fame in the 1990s, [...] appearing as Jagger Cates on the soap opera General Hospital from 1992 to 1995".
Found with the Google query
movie cells expel calcium fbi which returns the above Yahoo thread.