sony kdl40w4000 poor/dull picture colour?

akrama

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please kindly help my tv come from repair, actual fault was tv main pcb board burnt, they replaced,
but problem is since its came back, my tv picture are dull/gray/looks darker. i set all picture setting but nothing change ..also when i try to access service menue its open and gone. its not stay on screen...
please can any one tell me, its needs setting or its required engineer visit thanks

i try to access service manue its appear and and went off in seconds
info
5
volume up
power
manue came and instanly disapear
 
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