Sony KD-34XBR960 (DA-4 chassis) 7 blinks no HV...Help me understand!

[Electronic M]

Well I went with path 3 and the 960 is now probably working the best it has since I've owned it.
In the course of futile attempts to use menu settings to make that last spare incorrect (or possibly damaged) but functional board fill the screen I learned some new menu items that helped me better minimize overscan with the correct board.

The garage KV-34XS955 is going to have to live with the wrong board, but finally my daily driver KD-33XBR960 is back to and better than normal.