manumathew.017
Member
When I closed the laptop observed that the system is booting up but the keyboard and trackpad are not working.
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A1466 No back light
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manumathew.017
Member
Also, i have noticed the fan is running at full speed. keyboard backlight is glowing
manumathew.017
Member
Looks like the flex cable contact is bad, I have tried to fix it and inserted again. Now I don't see the backlight anymore, Basically, EDP_BKLT_EN is missing. But still, there is a chime sound. When I bypassed Q7707 the entire screen is white.
Check SMC_LID signal.
manumathew.017
Member
smc_lid - I have disconnected the flex cable --- > Voltage is 3.4V when the display LID is open. Voltage is 0 when the LID is closed. Still, I don't see a backlight. I am testing without flex able. And I have ordered a new cable. Does this cable and backlight are related ???
Do you talk about LIO flex?
You should get image/backlight without it.
You should get image/backlight without it.
manumathew.017
Member
I am talking about IPD flex (J4800). Will image or /backlight get without this cable?
You must get image without trackpad also.
manumathew.017
Member
Ohh is it ? , Then what would be the reason for backlight missing, I don’t see EDP_BKLT_EN. It’s 0V
Missing image at same time?
DP_INT_HPD stays high?
DP_INT_HPD stays high?
manumathew.017
Member
I don't think there is any image on the screen. At least I can't see anything on the screen. But there is 24.7V on PPHV_S0SW_LCDBKLT. Apple logo light at the backside of the lid is glowing now. DP_INT_HPD is continuously varying between 2.45V to 2.55V.
So the backlight circuit works; 25V is correct output.
Try known good working LCD assembly.
If still no image, check diode mode to ground on all data video lines.
Also be sure all the caps are in place and have good traces.
Try known good working LCD assembly.
If still no image, check diode mode to ground on all data video lines.
Also be sure all the caps are in place and have good traces.
manumathew.017
Member
I have removed and connected the board , hdd and all the connections. Now good news is image and backlight is there. I suspect something were wrong with smc/Pram memory. The touchpad flex cable might had a short internally. I don’t want to try this broken cable anymore. Ordered new one. Waiting for it.
manumathew.017
Member
After running diagonis test I got this error☹https://drive.google.com/drive/folders/1-XxwKVoqJRz6wy5Qum9ID6GH7m1OYSJ7
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Does the machine work correctly now?
Fan spins normal, macOS isn't slow?
Fan spins normal, macOS isn't slow?
manumathew.017
Member
Yes, everything solved, Fan connecter was lost, Then I have removed and cleaned the display connector. Now the system works perfectly so far
Then is OK, don't bother with that error.