SAN FRANCISCO — Now that plaintiffs in a giant class action over price-fixing in the LCD market have inked a $30 million deal with Toshiba, the main question remaining is how big a check to write the lawyers.

More than 150 law firms involved in the long-running multidistrict litigation before U.S. District Judge Susan Illston stand to reap hundreds of millions in fees — with four Bay Area plaintiffs firms profiting most.