iMac 20 2009 LCD issue

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hi bunch ,
there imac 20inch 2009 repair . no lcd , no 4-ty light test diode.
model k50 820-2347-a , found line ppmcpcore_s0_reg short ground.
when desolder u7401 nvidia , short conection disappears. put new u7401 ic , short conection here . check capacitors around -ok.
ideas welcome.

kind regards
lugo
 

swap out logic board? :p
 


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