iMac won’t boot with built-in display connected
It had a damaged 30-pin display connector (torn off by previous owner) on the logic board & also some minor damage to the 30 pin ribbon cable.
I bought a replacement connector and ribbon cable from eBay, just to be sure it would connect properly.
Numbers listed on eBay for the ribbon cable:
Part Number: 593-1006 922-9132
MPN: Y593-1006 922-9132
I reassembled the machine, but it would not boot at all. No startup sound, no beeps, nothing. However it does boot with the display disconnected.
I have ordered an adapter, Mini DisplayPort (Thunderbolt) to VGA/HDMI/DVI, to see if will run with an external display, as a workaround.
But I would much rather fix it properly, so it runs with the built in display. Can anyone shed some light on this?
Update (02/07/2018)
- Only 1 LED's is on with all 4 monitor cables which I think is LED #1 as it is a little hard to see through the vent.
- All 4 LED's are on with LVDS cable disconnected.
- All 4 LED's are on with LVDS disconnected & backlight power cable connected.
- All 4 LED's are on with LVDS disconnected, backlight power cable connected & the vertical sync ribbon cable connected. I am also getting a very dull grey illuminated screen/monitor & 3 minutes 10 seconds later screen/monitor goes dark i.e. from the dull grey.
Update (02/10/2018)
Schematic mentioned below:
Is this a good question?
3 Comments
Hold on here!! You need a mini-display port cable, NOT a Thunderbolt cable! While they look alike they are not the same!
by Dan
What does the built-in diagnostic LED's telling you?
by Dan
@ifixanythink "damaged 30-pin display connector (torn off by previous owner) on the logic board " post some pictures showing the damage on the board as well as the complete board. That way we can see what you see Adding images to an existing question
by oldturkey03