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I have removed the board, it is 820-00928-A, I could see some areas are a little dirty and a bit corroded. Please find the video attached. Does anybody have a schematic and board view for this particular model? https://drive.google.com/drive/folders/1G3IAYy5MHZELmZ5BPY-4LleGXIGuQjGn?usp=sharing

I could find the 820-00281 schematic, As per this schematic and board file here is the voltage values All the readings are using the charger after disconnecting the battery connector. After disconnecting the battery it consumes a total 1.47Amp current at 19.7V. L8410 - PPVIN_S0SW_LCDBKLT - 0V...

It's not starting up, But the fan is running, No chime, No display, or No backlight Could someone please help me with the schematic and board view?

Hi Patricia, Could you help me with a working bios for 0820-00239 board? Incase if you have it's backup?

Just tried this method , Start the built-in AHT: This is worked ,,,,,, I could see the wifi selection window on internal screen ,,,,

Hi, In USB what activity should I monitor? Can you tell me the net names?

One more input - I have a strong feeling that scenario 1 and scenario2 are related to temperature. If the heatsink is hot it doesn't go to loop. Or else it goes to loop. Regarding the PRAM reset - I could hear only one chime when I press all four keys, Keep waiting for the second chime but it's...

PRAM reset doesn't help

Scenario1 - Loop L7210 - PPVCC_S0_CPU - 1.078V L7220 - PPVCC_S0_CPU - 1.078V Scenario 2 - No response L7210 - PPVCC_S0_CPU - 1.049V L7220 - PPVCC_S0_CPU - 1.049V

Could someone please advise me on how to proceed?

Let me elaborate a little more , When I power up its goes to two different scenarios Scenario1- it goes to loop with a chime sound. When it is in the loop I can see there is the backlight. Scenario 2 - When I try to start No backlight, Slowly CPU heat increasing and the fan works after some...

I think the backlight is there but no image, So I couldn't realize that

PPVOUT_S0_LCDBKLT is 44V but not back light

Yes now its started chimming again , Even while chime SMC_LSOC_RST_L stays high (3.9V). BUF_SMC_RESET_L couldn't monitor

SMC_LSOC_RST_L stays high (3.9V). BUF_SMC_RESET_L - This I couldn't measure Because the test points are located on bottom layer where I don't have access when the board is mounted

Sad news is it stopped Chim . I don't know what happened?

Shall I remove the board separately and check it ? Or with the display and enclosure connected?

Is there anything else I can try in this board?

Yes ,I have measured the impedance it was high, So kept the ferrite bead back, and it's working now. Thanks

Does it mean that I have to change the screen first to fix the issue ?