iMac Intel 27". EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz), EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz)

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I removed vsync able but it works?

I've repaired my iMac's graphics card.

but, during replacement I found v-sync cable broken.

but it works the lcd shows screen normally I think.

except it flickers time to time (once in 10 sec?)

Is it normal? or not?

Answered! View the answer I have this problem too

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I know of no one who would know the answer to this. Techs replace parts, not leave them out.

See Dan's answer for what it does: What does the vertical sync cable used for?

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clichedmoog will be eternally grateful.
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