in file manager/templates/default/element/tv/renders/input/image.tpl (/manager/index.php?a=system/file/edit&file=manager/templates/default/element/tv/renders/input/image.tpl&wctx=mgr&source=1):
{if $tv->value}<img src="{$_config.connectors_url}system/phpthumb.php?h=150&w=150&zc=1&f=png&src={$tv->value}&source={$source}" alt="" />{/if}
{if $tv->value}<img src="{$_config.connectors_url}system/phpthumb.php?h=150&w=150&zc=1&f=png&src={$tv->value}&source={$source}" alt="" />{/if}