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After running diagonis test I got this error☹https://drive.google.com/drive/folders/1-XxwKVoqJRz6wy5Qum9ID6GH7m1OYSJ7

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...

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.

Ohh is it ? , Then what would be the reason for backlight missing, I don’t see EDP_BKLT_EN. It’s 0V

I am talking about IPD flex (J4800). Will image or /backlight get without this cable?

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 ???

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.

Also, i have noticed the fan is running at full speed. keyboard backlight is glowing

When I closed the laptop observed that the system is booting up but the keyboard and trackpad are not working.

However the issue is resolved. Apparently the driver IC and Q7707 were faulty. Replaced both and it's working perfectly☺️

Yes, the problem solved, I have shorted the 1st and 6th pins of Q7707. Found the backlight is present. Then I have replaced the Q7707 with a new one. Now it's perfect. Thanks for the support

Now I can see both BKLT_PLT_RST_L and EDP_BKLT_EN are present and 3.3 V but Q7706 is not functioning I mean I get 0V at PPVIN_S0SW_LCDBKLT_FET. And 8.3V at PPVIN_S0SW_LCDBKLTFET. I don't have Q7707 MOSFETs spare. Am I allowed to connect LCDBKLT_EN_DIV_L directly to Ground for testing purpose?

Sorry, My approach was different. My Apologies. Back to the board, I have removed U7420, Now PPBUS_G3H gives 0.373V in diode mode. Which means there is no short. Should I replace the FDMF5808A (U7420) with a new one?

You are right when I removed the inductors I don't see any short in ppbus_g3h . I thought it's the problem with CPU ☹️.

I have removed the three inductors and measured the resistance at 1st and 2nd pin of the inductors. 2nd pin of all the inductors are 1.8 ohm . 1st pin resistance are below. L7430 1st pin - 1.017K L7420 1st pin - 425 Ohm L7410 1st pin - 1.017K ....... Please ignore what I did, do you have any...

I am confused now, Is the problem is at the load side or at the source side?

Sorry Just noticed that After removing the inductor's Load side is 1.6 Ohm (2nd pins of all three inductors). L7430 1st pin - 1.017K L7420 1st pin - 425 Ohm L7410 1st pin - 1.017K

I have removed all the three inductors, The sort is after the inductor I mean on the 2nd pin towards the load side.

For more clarity putting the diode mode measurement also along with this L3500 - 636 Ohm - 0.222V L8410 - 4.3 Mohm - 0.837V L7030 - 1.23 Mohm - 0.415V L7600 - 0.6 Mohm - 0.415V L7660 -1.6Mohm - 0.359V L7430 - 2 Ohm - 0.002V L7420 - 2Ohm - 0.002V L7410 - 2 Ohm - 0.002V L7210 - 4.2 Ohm -...

Yes I have measured the resistance to ground without power. Here are more measurements L3500 - 636 Ohm L8410 - 4.3 Mohm L7030 - 1.23 Mohm L7600 - 0.6 Mohm L7660 -1.6Mohm L7430 - 2 Ohm L7420 - 2Ohm L7410 - 2 Ohm L7210 - 4.2 Ohm L7220 - 4.2Ohm L7270 -6.7Ohm L8000 - 89.7 Ohm L8050 -...