Sony Bravia KDL-40V2500 that will not power on

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I have a Sony Bravia KDL-40V2500 that will not power on. The indicator flashes red 3 times.
I do not hear any sound and I cannot see any backlight.
I have tried disconnecting every cable on each board one at a time to see if anything changes.
The only change is when I disconnect AC-DET cable on the Power Supply board or on the other end if I unplug the CN7009 connection on the B-Board and try to power on the TV the indicator will stay on solid green until I power off.
My friend ordered another used power supply board but it is also doing the red indicator flash 3 times with that one.
So either both power supply boards are bad or maybe there is a different problem.

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testing voltage on AC-DET.
With AC-DET cable connected 2.8 V
with the AC-DET disconnected about 3.4 V

on the connector to the right, I am not getting 18V on any of those pins. It only reads about 0.2 mV on each one

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testing voltage on the pins on this larger connector on the right hand side of the board I see only low voltage on every pin with the cable connected
But I get 3.4 V on standby pin with the cable disconnected

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Could anyone please help me diagnose this issue?