Chosen Solution
I swapped my HDD for an SSD and in the process of reconnecting the display cable (LVDS?), unbeknownst to me, I skewered the corner of the cable pins on the logic board end when fitting it in - one of the pins snapped off. Tried to fire it up, and it did, but no display (not a backlight issue) and a fast fan. Took it apart and that’s when I noticed the cable was bad… Got a new cable from eBay, replaced it, still no 4th LED or display.. Ran diagnostics and get vfd001 and pfm006. External monitor works fine. The fan runs fast, the system is sluggish, and the CPU runs at 70% with a high kernel rate of 200-300% (I don’t know WHAT that means, I just know how to find the stuff in the activity monitor and google…). I saw one post about bypassing the SMC to kick the kernel issue (unplug from wall, press power for 10seconds, plug in, and then press power again), which it worked and everything was SSD fast (at least something was working!) but of course the fan was going even faster then and still no display (only external works). From what I can tell, there are no bad fuses/connections on either side of the board. Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad? Thanks for any possible insights! EDIT: Tested 3 new lvds cables and no change. I’m leaning towards a bad SMC chip or resistor somewhere that I can’t see. Update (01/28/2020) Here is a snapshot of the stat sensors that I realized I could get and possibly relate to an issue on the board. Notice that there are multiple sensors with no reading (including the LCD one…). Could anyone tell me where each of these are to confirm connection/look closer at? -BLC Proximity -LCD (I know this is the one on the back of the LCD near the LVDS cable) -Logic board DIMM Local Board
- Logic board proximity -SO-DIMM Proximity -Timing Controller I see the GPU has no power consumption listed, it’s just 0.00…that can’t be good for this issue, can it? Or does it only process if it’s actually got a place to send power (e.g., a properly connected display?)
I’d bite the bullet and try another display. They do go out. First rule before messing with the logic board is to use “known good working parts” This has been a life saver when I’m pulling my hair out. Find a display with a good return policy on whatever site you use and do that FIRST!
Same problem here, problem with screen fell to the table afert change hdd to ssd, I interested on works without original screen, only with external monitor, is possible disable screen? Thanks
