|Feb 13, 2013, 06:55 PM||#1|
iMac 8,1 (2008 alu 24") blank screen
I've got a 2008 aluminimum 24" imac. 3.06GHz, 4GB, 250GB. The screen started to just turn off around 2 weeks ago. Sometimes the machine would power on and work for around 1-2 hours, but sometimes only around 15 minutes.
The screen just goes black. No funny flickering, no odd pixels etc. Just off.
The superdrive is still reading etc, if I put in a disk it spins and reads, I can also hear the hard drive reading etc.
I opened the imac and checked the graphics card. Its the 512MB Nvidia 880GS.
I sent the graphics card to a company to test it and it worked directly in one of their machines for an entire day.
I've replaced the ram and the lcd screen too.
When I power up the machine I check the little diagnostic leds and it shows
LED 1 - ON
LED 2 - ON
LED 3 - ON
LED 4 - OFF
but the screen is just black.
Any ideas - I'm thinking it may be the logicboard but surely the dvd drive and hard drive wouldnt power on?
|Feb 13, 2013, 07:17 PM||#2|
|Feb 13, 2013, 07:25 PM||#3|
I've not checked the invertor, but I have tried two complete lcd screens - the LCD's have the inverters installed so I'm guessing they are fine...
If the logicboard / mainboard has failed would the dvd drive etc still power on?
I have noticed though none of the fans are coming on when I turn on the machine....
|Feb 13, 2013, 07:35 PM||#4|
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