Panny 42PZ80U issue

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Mark G
Panny 42PZ80U issue

42" plasma, powers on, steady front LED (no blinkin codes), display almost comes up, but fades to probably 98% dark. 

 Its got to be either the tuner/input board (in middle), or the logic board(A board) underneath. Why?

because when i disconnect the data/sig cable (real real tiny fine, multi colored wires w/ metal lok tabs) connecting between the 2, I get a nice white bright raster. So with that I'm assuming P-supply, buffers, plasma display,etc is ok. What I would like to nail down is which boards kaput?.. sig boards bout 200$, logic board can be had for 50$....Would like an opinion and/or experience with this sort of paltry dilemma. Thank you 

 

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