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Apple Computing Products:
macOS - Desktop Hardware
27" imac 2011 screen doesn't turn on but it still works
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<blockquote data-quote="techiesteve" data-source="post: 1841683" data-attributes="member: 98520"><p>Every 6970M GPU failure I've seen has effected both the iMac's display and external video. The GPU is a BGA surface mount device soldered to the video card PCB, and the video card is socketed to the rear of the logic board. If there was a backlight issue, the image should faintly be seen on a clean screen, and better with a torch shone on the screen. Likely an LCD fault, I have seen similar symptoms as described by the OP. Part no longer available from Apple now as it's a vintage product. Buying used you can never be sure of quality. Many display's now suffer from serious dust ingress, looking like cloudy sky's, others may be dim.</p></blockquote><p></p>
[QUOTE="techiesteve, post: 1841683, member: 98520"] Every 6970M GPU failure I've seen has effected both the iMac's display and external video. The GPU is a BGA surface mount device soldered to the video card PCB, and the video card is socketed to the rear of the logic board. If there was a backlight issue, the image should faintly be seen on a clean screen, and better with a torch shone on the screen. Likely an LCD fault, I have seen similar symptoms as described by the OP. Part no longer available from Apple now as it's a vintage product. Buying used you can never be sure of quality. Many display's now suffer from serious dust ingress, looking like cloudy sky's, others may be dim. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
27" imac 2011 screen doesn't turn on but it still works
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