Have the same problem here with a mid 2010 imac emc 2389 a1311z i bought a new led panel with new inverter board.
Imac inverter board repair.
Apple imac led backlight inverter board 612 0062 iv87169 t a11 hf 30daywty.
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Lay your imac stand side down on a flat surface.
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Diagnostics led 1 2 3 are on and led 4 off and don t blink on startup.
Https ebay to 2sdlfcs this is a great video on how to fix your broken imac 2009 2010 2011 look no further this video will explain how to fix your screen if its.
To lift the front bezel off the imac simultaneously.
But still got black screen.
Best priced inverter part.
Buy this genuine a1224 inverter board for imac 20 inch mid 2007 from macwave.
Use your thumbs to press in the ram arms and hold the imac down.