Custom Post Type posts not showing in category

Add post_type to first $args

<?php 
    $args = array (
        'cat'              => 3,
        'post_type'        => 'tv',
        'posts_per_page'   => 3
    );

     $the_query = new WP_Query( $args ); ?>
            <?php if ( $the_query->have_posts() ) : ?>

        <?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?> 
           <?php the_title(); ?>
        <?php endwhile;  ?>

    <?php endif;
     wp_reset_postdata();
    ?>