820-00163 not started

[Thomas2020]

PP3V3_S0 1,2v
the thermal imaging camera showed the heating up U8030 has been replaced

PP3V3_S0 1,2v 3,3V

the computer restarts for 13 seconds
no sound during startup

PRAM reset.... nothing changes
attempting to run in SMC bypass (the fans are running at full speed, no startup sound, no picture and no picture backlight, power consumption 20v 2.5a)

Is that enough to say damaged GPU CPU ?

 

[2informaticos]

2.5A is too much, considering battery is not connected.

Do you get voltage on all coils, including CPU core and GPU?
PLT_RESET_L comes high?
Try known good BIOS, just in case.

 

[Thomas2020]

I will give voltage in the evening.

you can help with what kind of bios I can trust

 

[2informaticos]

Test this one...

820-00163 clean ME fixed SSN.bin

drive.google.com

 

[Thomas2020]

after uploading the bios from you, the laptop starts no backlight and image chime.
Current consumption 20v 1A
PLT_RESET_L high 3,32v

L7330 1.78V
L7320 1.80V
L7310 1.80V
L9330 0.85V
L7870 1.51V
L9360 0.85V
L9410 0.90V
L8760 0.97V
L8710 1.50V
LL560 3.32V
L7630 1.06V
L7430 1.36V
L7130 12.58V
L3095 0.00V

Q3080 damaged ?
1 TBTBST_PWREN_DIV_L 12.02V 2,1 M ohma
2/3 PPVIN_SW_TBTBST 0.00V 670k drops to 87k ohm
4 PPBUS_G3H 12.58V 0,83M ohms

 

[2informaticos]

Bad CPU probably.
Keep in mind, these boards suffer by FDMF6808 issue.

 

[Thomas2020]

What should be done to be 100% sure that the processor is damaged ?

thermovision record:

ScreenRecorderProject1.avi

drive.google.com

 

[2informaticos]

This is not an exact science.
We don't have the test tools like the manufacturer.
GPU can also fail, or RAM.
Could be even just a cracked resistor, or trace.
You can test BIOS and inspect the board.
Changing CPU power supply chips I don't think to help in this case.