820-00840 no image or backlight

[PPVCC_S0_CPU]

Its a water damaged board, damage was mostly around vcore coils and u6100, cleaned everything and board boots up but there is no image or backlight on screen, there is usb activity when i connect external device and cpu also gets warm.

Vcore starts from .9 volts and then drops to .6 volts after few seconds.
Backlight_en -0v
pp5v_s0sw_lcd - 0v
Pp3v3_s0sw -0v
Edp_panel_pwr_en -0v

Can it be the cpu? I saw in Louis's video that backlight line and edp_int_aux_n are next to each other, and a slight spike from backlight line to edp_int_aux can fry that part of cpu.
is there anything else i can check before declaring it dead?

 

[2informaticos]

EDP_INT_AUX_N is not connected directly to CPU; C8529 should protect it.
I'm afraid iGPU was affected by liquid on L7410/20/30 area.
Do you get voltage on them, at least?

Check all LCD data lines in diode mode to ground; on CPU side.

 

[JohnB8812]

Liquid near the CPU coils is likely an RIP. If no external video, this is probably done for

 

[PPVCC_S0_CPU]

No voltage across l7410,20,30. I have checked working board aswell, it also doesn't have any voltage on those coils, i will check data lines and see what they say.

 

[PPVCC_S0_CPU]

Checked data lines on cpu side and all have .300v drop to ground

 

[2informaticos]

iGPU coils get voltage under high load graphics only, I suppose.
In your case, liquid spill on that area probably killed iGPU already.