I didn't see a response from my last note, but wanted to send the following information before I sign off for the night.
In my experience, MOST of the time when the display blanks out, it is caused by either failed display OR a loose connection (perhaps cause by battery leakage) inside the handset. And when these come into the shop, the cost of repair (parts and labor) is usually more than purchasing a replacement handset.
So if you absolutely need to have this 1 of 5 handsets to work, I would recommend getting a replacement handset and then register that replacement to the main base unit.
As a reference, I have a link below to the search results I got on Amazon when searching for this particular handset.
Click Here --> http://amzn.to/2dujNpz
NOTE: The last LETTER you may see represents the COLOR of the handset (B=Black, S=Silver, etc.).
Please let me know what you find or if you have any more questions.
If this has answered your question(s), please take a moment to rate MY service level (5-star is my goal) so that I get credit for my time helping you with this question.
You should see some "stars" (and SUBMIT button) to do that, but please let me know if you do NOT see them (you may have to scroll UP or DOWN) or can not use them.
Thanks, ***** *****