I just made a video for a customer on how to test the board we've sent him as well as his own Sony KDL-50EX645 power supply DPS-162LP and I thought I'll include a link to it here:
The most common failure of DPS-162LP causes the TV to be blinking 7 times, and is manifested in lack of 24V upon signaling the board as shown on the video.
Of course other failures are also possible.






























