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if the v-sync cable is not connected, will this stop the display from powering up?
I had to replace the hard drive recently and noticed that the v-sync cable was damaged, looks like it was repaired at some point.
External display works but there is some artifacting and vertical lines
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More than likely if the external display is showing artifacts and lines then the problem is with the video card or RAM. You could somewhat test this by taking a screenshot (command + shift + 3) and then checking the screenshot to see if the lines/artifacts are visible in it. If they are then the video card is likely the culprit.
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I think the lines and artefacts are not related and to do with the display port to hdmi adapter i was using.
I don't have the v sync cable in place at the moment. It seems a botch repair has been done as on closer inspection there's some damage on the display power connector and the display data cable connector. Is there a way to test the display is getting any power and/or the data cable is working?
Dan, you could use the 4 diagnostic LEDs to troubleshoot the power flow through the iMac. They are located just to the left of the RAM slots and should be visible through the vent holes in the bottom of the Mac. They read 1 - 4 from left to right. LED 1 indicates that the power supply is supplying proper trickle voltage to the logic board, this should always be illuminated when the iMac is connected to power. LED 2 indicates the logic board is receiving and routing power properly, this should always be on if the iMac is powered on. LED 3 indicates video signal is being produced and routed from the video card to the display/s. LED 4 indicates that the display and video card are communicating properly. If LED 4 is on but there is no image on the display then either the backlight board or LCD itself is bad since the logic board is still detecting communication between the LCD and the computer. If LED 4 is off then the cable/s could very well be the culprit.
LED 4 is not on. THe data cable seems okay with a continuity test.
It appears the socket on the logic board has been replaced at some point as looking very closely, one of the legs of the connector is not attached to one of the pads on the board.
So my options are to either replace the logic board for about £900 or find someone to re solder the connector.
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