Default feature image for all products

<?php
  // set default product feature image
  // code goes in functions php for your child theme
  add_filter ('woocommerce_single_product_image_html', 'set_default_product_image', 10, 2);
  function set_default_product_image($html, $post_id) {
    $position = stripos($html, 'placeholder.png');
    if ($position !== false) {
      $html = '<img src="https://www.my-site-name.com/wp-content/uploads/logo.jpg" alt="Logo" class="alignnone">'; // alter to suit
    }
    return $html;
  }

Should work on the product page but sorry doesn’t work on the archives page.

This should work for the product archives page:

add_action( 'woocommerce_before_shop_loop_item', 'before_imageless_product', 9 );
  function before_imageless_product() {
    if( !has_post_thumbnail( get_the_id() ) ){
      remove_action( 'woocommerce_before_shop_loop_item_title', 'woocommerce_template_loop_product_thumbnail', 10 );
      echo '<div class="no-image"><img src="https://www.mysite.com/wp-content/uploads/logo.jpg" alt="Logo" />';
    }
  }

  add_action( 'woocommerce_after_shop_loop_item', 'after_imageless_product', 9 );
  function after_imageless_product() {
    if( !has_post_thumbnail( get_the_id() ) ){
      add_action( 'woocommerce_before_shop_loop_item_title', 'woocommerce_template_loop_product_thumbnail', 10 );
      echo '</div>';
    }
  }

For some themes you may get doubled images, if so, comment out the last add_action line.