My house was hit by lightning. When I came home and turned on the tv the screeen started turning black in a circular motion spreading across the screen.
Check connector between Logic & PSU 2nd pin from Left (Vs_ON) for DC volts.
If Voltage is 0 then problem is with Logic or SSB.
If Voltage is 3.1 VDC then problem is with PSU or other PCB's on Panel.
On startup Logic checks for errors and also polls the SSB for Errors. If Errors found then Logic will not send High to PSU.
To confirm if SSB or Logic is at fault then disconnect and remove SSB.
Use 2 Jumpers to short J8003 & J8004 on the left edge of the PSU
Use 1 Jumper to short CN2012 on the lower left part of the Logic PCB (White signal to the Display).
Plug in the AC to the PSU thru CN8001.
If PDP panel operates with White field screen then problem may be the SSB.
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