Samsung UN55D6003SFXZA Not Displaying

[notaguitarhero]

Hey everyone, I've got a Samsung TV UN55D6003SFXZA that is not working. If I unplug the TV from the outlet, wait a few minutes, and plug it back in, the startup screen ("Samsung SMART TV") appears on the screen for a second before the screen goes dark. At the same time, the standby light blinks 5 times. And then if I try to press the power button, the standby light blinks once each time.

I disconnected both the main board AND the LED connections, and noticed the voltages at the power supply pins cycle up and down - is this supposed to happen? There seems to be a sound (sounds like a cricket, if that helps) coming from TM801S every 4 seconds or so, and after 90 seconds or so it stops making that sound. After disconnecting the power, the sound continues a few times before stopping. Does this mean the power supply board is bad?

Any help I can get would be great! I'm giving this one last chance before I take it apart and sell for scrap parts.

Here are the voltages with various configurations: with only the main board disconnected, everything hooked up, and with both main board and LED disconnected.

CNL802 (connection to LED)
With only the main board disconnected:
Pin 1 (VF+) = 325VDC peak, 322VDC steady state
Pin 3 ( - ) = 162VDC peak and steady state
Pin 5 ( + ) = 162VDC peak and steady state
Pin 7 (Dim-) = 1.1VDC peak and steady state
Pin 9 (IF2) = 0.6VDC peak and steady state
Pin 10 (IF1) = 0VDC steady state

With everything hooked up:
Pin 1 (VF+) = 328VDC peak, 297VDC steady state
Pin 3 ( - ) = 200VDC peak, 177VDC steady state
Pin 5 ( + ) = 210VDC peak, 177VDC steady state
Pin 7 (Dim-) = 90VDC peak, 62VDC steady state
Pin 9 (IF2) = 0.6VDC peak and steady state
Pin 10 (IF1) = 0VDC steady state

With main board and LED disconnected:
Pin 1 (VF+) = 400VDC peak, drops in voltage, goes back to 400VDC after every other sound.
Pin 3 ( - ) = 0.001VDC
Pin 5 ( + ) = 0.001VDC
Pin 7 (Dim-) = 0VDC
Pin 9 (IF2) = 0.6VDC peak, drops to 0VDC, goes back to 0.6VDC after every sound.
Pin 10 (IF1) = 0VDC steady state


CNL803 (connection to main board)
With only the main board disconnected:
Pin 1 (N.C.) = 0VDC
Pin 2 (N.C.) = 0VDC
Pin 3 (B13V) = 12.74VDC
Pin 4 (EPWM) = 3.209VDC
Pin 5 (B13V) = 12.74VDC
Pin 6 (N.C.) = 0VDC
Pin 7 (Vamp) = 16.41VDC
Pin 8 (BLU_ON) = 3.005VDC
Pin 9 (Vamp) = 16.41VDC
Pin 10 (GND) = 0VDC
Pin 11 (GND) = 0VDC
Pin 12 (GND) = 0VDC
Pin 13 (B5V) = 5.37VDC
Pin 14 (A5V) = 5.37VDC
Pin 15 (B5V) = 5.37VDC
Pin 16 (PS-ON) = 3.359VDC

With everything hooked up:
Pin 1 (N.C.) = 0VDC
Pin 2 (N.C.) = 0VDC
Pin 3 (B13V) = 12.71VDC
Pin 4 (EPWM) = 0.007VDC
Pin 5 (B13V) = 12.71VDC
Pin 6 (N.C.) = 12.66VDC
Pin 7 (Vamp) = 18.88VDC
Pin 8 (BLU_ON) = 0.14VDC
Pin 9 (Vamp) = 18.88VDC
Pin 10 (GND) = 0VDC
Pin 11 (GND) = 0VDC
Pin 12 (GND) = 0VDC
Pin 13 (B5V) = 5.35VDC
Pin 14 (A5V) = 5.36VDC
Pin 15 (B5V) = 5.35VDC
Pin 16 (PS-ON) = 3.30VDC

With main board and LED disconnected:
Pin 1 (N.C.) = 0VDC
Pin 2 (N.C.) = 0VDC
Pin 3 (B13V) = ~15VDC peak, drops almost to 0VDC, goes back to ~15VDC after every sound.
Pin 4 (EPWM) = 2.9VDC peak, drops almost to 0VDC, goes back to 2.9VDC after every sound.
Pin 5 (B13V) = ~15VDC peak, drops almost to 0VDC, goes back to ~15VDC after every sound.
Pin 6 (N.C.) = 0VDC
Pin 7 (Vamp) = ~16VDC peak, drops almost to 0VDC, goes back to ~16VDC after every sound.
Pin 8 (BLU_ON) = 2.7VDC peak drops almost to 0VDC, goes back to 2.7 VDC ater every sound.
Pin 9 (Vamp) = ~15VDC peak, drops almost to 0VDC, goes back to ~15VDC after every sound.
Pin 10 (GND) = 0VDC
Pin 11 (GND) = 0VDC
Pin 12 (GND) = 0VDC
Pin 13 (B5V) = ~3VDC peak, drops almost to 0VDC, goes back to ~3VDC after every sound.
Pin 14 (A5V) = 5.37VDC
Pin 15 (B5V) = ~3VDC peak, drops almost to 0VDC, goes back to ~3VDC after every sound.
Pin 16 (PS-ON) = 2.6VDC peak, drops to 0.9VDC, goes back to 2.6VDC after every sound.