Chosen Solution
I recently had an issue with my LCD panel and I thought it may have been the LVDS cable but it ended up being the panel itself that is faulty. I have taken the iMac into an Apple Store where they ran some hardware tests - turns out the LCD Proximity Sensor has failed and the internal fan is running at a higher speed. Is the LCD proximity sensor on the logic board or is it part of the LCD panel?
The LCD Proximity sensor is the small 4 wire cable going from the LCD to the Logic Board seen here https://d3nevzfk7ii3be.cloudfront.net/ig… It routes behind some tape located on the back of the LCD to a small PCB that is adhered. If you want to replace it http://www.powerbookmedic.com/Intel-iMac… (Careful their returning through them isn’t the greatest experience) Please remember to adhere to all safety and ESD precautions.
so if I am to purchase another LCD panel the proximity sensor is part of cable/board on the LCD itself and not the small input connector on the logic board?
I seem to have the same issue, it’s been extremely slow after I replaced my screen for an iMac 27’’ Late 2015. I have the “Macs Fan Control” app installed, and I’ve noticed that I have a temperature sensor called “LCD Proximity 2” only. Is there supposed to be a “LCD Proximity 1”, and can this be the problem? Is it easy to fix?
