TYPO3 Core

Didn't add new TS or overwrite the default.

PageTSconfig (Module Info-> PageTSconfig):
[linkvalidator]
[searchFields]
[pages] = media,url
[tt_content] = bodytext,header_link,records
[tt_news] = bodytext,links
[linktypes] = db,file,external
[checkhidden] = 0
[showCheckLinkTab] = 1
[mail]
[fromname] = Linkvalidator
[fromemail] = Linkvalidator@example.com
[replytoname] =
[replytoemail] =
[subject] = TYPO3 Linkvalidator report

Do you need anything else?

you need to add the table sys_file_reference with column link to your config.

Your're right! That works:

mod.linkvalidator {
searchFields {
sys_file_reference = link
}
}

You can close that ticket.

Thanks a lot!