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There are two that I measure with 0V...

1V05_S0_LDO = 10.5v 1V5_S0_REG = 1.50v page 22 PP1V05_S0_PCH_VCCCLKDMI_F 1.00v PP3V3_SUS_PCH_VCCSUS_US 3.28v PP1V8_S0_PCH_VCC 1.8V PP1V05_S0_PCH_VCCIO_SATA 1.03V PP1V05_S0_PCH_VCCIO_USB 1.03v PP1V8_S0_PCH_VCCTX_LVDS_F 1.8V PP1V05_S0_PCH_V_PROC_IO...

Heated the CPU and still nothing. What else can I check/do?

i will try heating the CPU and get back to you. However my goal actually is to make this board work again. Not buy a second hand board. I went to this subscription exactly to repair this board!

Did you get my last message?!

Checked all the resistors on SPI Bus Series Termination and everything is matching the schematics value. heated with quality flux the PCH and still not turning. Ohhh should I do it on the CPU too? Maybe I melted the balls not sure....

I used the CH341A to erase and reprogram the BIOS with your file, but unfortunately it still didn’t work. It’s possible I made a mistake during the process, since this is my first time doing it. Also, I had asked earlier about using a BIOS from an 820-2936 board—would that be compatible?

By the way, I tried using a BIOS from another 820-3115 donor board, but I’m not sure if that BIOS was functional — unfortunately, it still didn’t work. I do have a CH341 programmer, but I’m not experienced with BIOS flashing or cleaning the ME region. Do you think I should give that a try...

Also can I use a BIOS from a 820-2936 donor board?!

PLT_RESET_L = 3.28v Should I try another BIOS? Is that it?

Also measured Q7550 PIN 1 = 12.5 PIN 3 AND 4 = 0V PIN 5 = 0V PIN 6 7 8 = 0V

Coils and voltage below. Seems to be something related to L7550 L3895 = 2.49 L7760 = 1.79 L7520 = 1.11 L7510 = 1.11 L7550 = 0V L7100 = 0.910 L7630 = 1.05 L7030 = 12.50 L7330 = 1.48 L7260 = 5 L7220 = 3.29

You nailed it. It was a really simple problem but I thought could be something on the board. Thanks for this!

I don’t have a detailed history of this machine — it arrived a long time ago, and I remember working on it briefly before setting it aside. Unfortunately, I don’t recall exactly what was done. At some point, I replaced the U7200, but it might have come from a donor board and could potentially...

I also tried using an external USB-to-SATA adapter, but it didn’t work. Should this method work, or is it only possible using the internal HDD cable? I don’t have the internal cable at the moment, but I’ll buy one if the USB-to-SATA setup isn’t compatible. However, if it should work, then...

Doesn't turn on. Fan start normal and then goes to full speed ppbus = 12.51 PP3V42_G3H = 3.44V PP5V_S5 = 4.94 PP5V_S3 = 0V PP5V_S0 = 5.05 Should I replace U7200?

I was able to successfully install El Capitan, but when I try upgrading to macOS Sierra, I get a forbidden symbol and the installation doesn’t proceed. I also attempted to install High Sierra using a USB stick, but the installation either fails or takes an unusually long time. It seems the...

You keep telling that data can be saved. I contact Apple and Apple third party both told they DO NOT do it. HOW TO SAVE DATA? Maybe in your location you CAN SAVE DATA!! we are talking about different countries I pay for this forum to find solution... fixes computers... receive money and put...

I’m really frustrated and confused at this point. You initially advised me to bring the device in DFU mode to a third-party for data recovery. But now you’re saying that other components might be damaged? How would a third-party recover data if the board is damaged? I’m seriously considering...

I called the authorized Apple in my city. Its the biggest one and they told me they don't do it I called a friend who is an IRP (https://support.apple.com/pt-br/irp-program) which I assume is the same as third party authorized service and he told me they never receive any instructions/equipment...