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Aktuelle Version von: oldturkey03 ,

Titel:

No Title (You should edit this question)backlight turns on for a short period
No Title (You should edit this question)backlight turns on for a short period

Text:

Hello guys,

I've replaced the backlight board by a brand new one, but unfortunately it didnt fix it. The sympthom is exaclty the same, i.e, right after the Mac is turned on, the backlight turns on for a short period (300ms lets say) and then turns off forever.

I suspect about some control signal. Since i already checked the ENABLE and PWM signals, the only one left is the VSync one.

I read on other forum that he mid 2011 no longer used a V-sync cable as it switched to an internal DisplayPort connection which integrated the V-sync into the main display cable.

Could a damaged vsync cable turn off the backlight?

Thanks!

Gerät:

iMac Intel 21.5" EMC 2428

Status:

open

Ursprünglicher Beitrag von: Felipe ,

Titel:

No Title (You should edit this question)

Text:

Hello guys,

I've replaced the backlight board by a brand new one, but unfortunately it didnt fix it. The sympthom is exaclty the same, i.e, right after the Mac is turned on, the backlight turns on for a short period (300ms lets say) and then turns off forever.

I suspect about some control signal. Since i already checked the ENABLE and PWM signals, the only one left is the VSync one.

I read on other forum that he mid 2011 no longer used a V-sync cable as it switched to an internal DisplayPort connection which integrated the V-sync into the main display cable.

Could a damaged vsync cable turn off the backlight?

Thanks!

Gerät:

iMac Intel 21.5" EMC 2428

Status:

open