820-2507 iMAC 27" 2009 chime , All LED indicators on but dull black screen

Don Anton

New member
Hi all,

This imac has dull black screen. means /i can see a sceen get powerd but black screen and no any postings.
Board has all 4 LED on.
I replaced the Grphic card, Screen, LCD power board, LCD cable, Main power board with known working parts, but still the same. So I asume this is a board issue as other than the board I have replaced everything to check. Appreciate your support.
 

2informaticos

Administrator
Staff member
Did you check external video?
Apart of chime, can you confirm USB activity?
Like Caps Lock LED reaction.
You must be sure board doesn't get stuck after chime...

Do you get black screen with backlight, no image?
 
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