Speaker distortion after Logicboard exchange.I changed the Logicboard of the iMac. Since I did this the speakers are not working properly. If I plug in both speaker...
"Speaker distortion after Logicboard exchange." için yanıtThe problem was that I accidentally pinched a cable to the left speaker with a screw that fixes the logicboard. I made sure there is no contact and then it worked well again.
"Do I need to buy a logic board?" için yanıtI have a similar problem with my mid 2010 i5 - 2,8GHz - 27inch iMac. It does not power up. I checked the 4 LEDs. When I disconnect the power cable on the back and then put it back on one (!) LED is lighting up once (!) and then goes off again and shortly afterwards lights up a second time but then no LED is lighting up and the power button does not do anything. I can't see which LED it is because the board is still in the housing but I suspect it beeing the first one. In the technician's manual it sais that LED 1 should light up steadily if connected to power. What could it mean if the LED just lights up twice shortly? EDIT: I just measured the pins on the logic board according to the technical document. I have 12V between pin 1 and 4 and i have constantly about 3V between pin 1 and 12. So, when pressing the power ON button pin 12 is not changing - it is the same when pressed and when not pressed. I then have nothing on pin 11, where the button is pressed or not pressed at all. I am a bit confused because...