No internal video, high fan, and throttled CPU after replacing HDD
Hello,
I followed your guide and replaced the HDD with a SSD in my iMac (late 2013 A1418 21.5” 2.7 GHz).
Everything was pretty easy, however my screen is now completely black. Makes chime when I turn it on. LED diagnostic lights 1-3 are on, but 4 is off. External monitor works fine, and I used this to set up the new SSD (evo 860) and install MacOS. One thing I noticed was the iMac seemed slower, not what I expected after adding a SSD.
Also after the hard drive replacement the fan was constantly on full blast. I downloaded Intel Power Gadget and confirmed my suspicion that my CPU was capped at 0.8 ghz, as opposed to the 2.7 it’s supposed to be.
I assume the display must have a thermal sensor and because there is no communication the fan speed and CPU throttling are occurring as a result of this?
I downloaded the Macs Fan Control app and all the reported temps are good and I can use the app to adjust the fan. I was hoping worst case scenario I could still use the Mac with an external display, but 0.8 ghz would drive me nuts.
I examined the logic board, cables, and connectors closely, and noticed the corner of the LVDS cable was slightly damaged. I purchased a replacement, but still no luck. The replacement cable could also be bad I suppose, but seems like wishful thinking.
Could the damaged cable have caused something else to short? Is there anyway to get around the throttling so I can use an external display?
Here is a picture of the damaged cable and my logic board.
Thanks - Cory
Ist dies eine gute Frage?
Lets see what the onboard diagnostics tells you (with the internal display reconnected & the external connected too) Press and hold the D key. Did you get an error?
von Dan
Thank you very much for your response. This is what I got. I also should mention I have reset the SMC and PRAM a few times.
There may be an issue with the System Management Controller (SMC)
Reference code: PFM006
There may be an issue with the display.
Reference code: VFD001
von Cory Holloway
Searching those codes, I found someone on here that had the same issue, but didn't seem to get it resolved - Display not working after SSD swap...VFD001 and PFM006, no LED 4.. It's weird how similar it is to mine, especially how they noticed the corner of the LVDS cable was messed up.
von Cory Holloway