Lenovo NM-D562 v2.0 main EC programming help needed

[questore]

At this point I suspect either the SPI chip is bad or there is something pulling down the communication lines. Could you check both resistance and voltage drop to ground on all of them (pay attention to the polarity/direction)?

I'm beginning to suspect the BIOS IC itself.
What is your IC part number?
I have read an article about a DELL xps that was acting exactly like mine for a partial second there is a voltage on SPI_CLK then CPU grounds it because its not answering fast enough. I order a new chip and see what happens.

BTW about your project:
1. Do you have activity on BIOS Pin 8# when you power it on?
2. When you have replaced you GPU with a different one, have you checked the GPU bios is good for it?

[davidebeatrici]

Sorry, I didn't notice you edited the message adding the questions and only checked this thread now.

I'm beginning to suspect the BIOS IC itself.
What is your IC part number?
I have read an article about a DELL xps that was acting exactly like mine for a partial second there is a voltage on SPI_CLK then CPU grounds it because its not answering fast enough. I order a new chip and see what happens.

Some motherboards have a Winbond chip, others have a GigaDevice. On the one I'm repairing (and upgrading) there is a GD25LR128DSIG.

1. Do you have activity on BIOS Pin 8# when you power it on?

Nope, the MOSFETs/VRMs refuse to power the GPU.

2. When you have replaced you GPU with a different one, have you checked the GPU bios is good for it?

Yes, I flashed this one: https://www.techpowerup.com/vgabios/255239/255239

Anyway, the short on NVVDD went away as soon as I removed the GPU. The one on FBVDDQ remained and I had to remove the memory chips one by one until it went away, unfortunately in cases like this the thermal camera doesn't help because the motherboard dissipates heat very fast.

I didn't check which chip(s) are effectively shorted yet and I honestly have no idea how it happened. I suspect this board was overheated many times, leading to a reduced lifespan for those components.

[questore]

New Bios chip arrived and it can be read and write while onboard. I was right.
2 BIOS tryed but none worked. Same symptom.
Next step is to clean the EC and let the board reprogram it

[davidebeatrici]

New Bios chip arrived and it can be read and write while onboard. I was right.
2 BIOS tryed but none worked. Same symptom.
Next step is to clean the EC and let the board reprogram it

The EC doesn't program by itself, I tried and the board just stays off. It can update itself from the BIOS though, leading to activity on the SPI CS# without CPU.

[questore]

The EC doesn't program by itself, I tried and the board just stays off. It can update itself from the BIOS though, leading to activity on the SPI CS# without CPU.

Does SPI CLK# voltage present when the board is out of the case?
I know i had SPI CLK# voltage 2 times but not eversince.
I'm begining to suspect that since LID_SW is comes from the LCD connector, this board cannot turn on without the LCD even connected.
Also TP connector has the same LID_SW_N output so maybe it can also effect the process. Maybe i had SPI_CLK only when the board was in the case holly-molly.

[davidebeatrici]

Does SPI CLK# voltage present when the board is out of the case?
I know i had SPI CLK# voltage 2 times but not eversince.
I'm begining to suspect that since LID_SW is comes from the LCD connector, this board cannot turn on without the LCD even connected.
Also TP connector has the same LID_SW_N output so maybe it can also effect the process. Maybe i had SPI_CLK only when the board was in the case holly-molly.

I can guarantee the board POSTs just fine when out of the case and with nothing connected to it, I tried with another one that is working.

[questore]

I have checked some rails and RTCRST is never gets high but RSMRST is high as it should

[davidebeatrici]

I have checked some rails and RTCRST is never gets high but RSMRST is high as it should

Is 3V_RTC present? If yes, is EC_RTC_RST_R_N also present?

[questore]

Is 3V_RTC present? If yes, is EC_RTC_RST_R_N also present?

- 3V_RTC present
EC_RTC_RST_R_N 0v because there is not RE874 on the board. is it not optional?

[davidebeatrici]

- 3V_RTC present
EC_RTC_RST_R_N 0v because there is not RE874 on the board. is it not optional?

Sorry, I confused the names. The entire sections is indeed optional because marked with @.



RTCRST is also low in my case, it's not connected to anything with the factory setup.
RSMRST is what matters.

What are the voltages on CPU, GPU, RAM and VRAM? Are the various PWROK asserted?

[questore]

Sorry, I confused the names. The entire sections is indeed optional because marked with @.



RTCRST is also low in my case, it's not connected to anything with the factory setup.
RSMRST is what matters.

What are the voltages on CPU, GPU, RAM and VRAM? Are the various PWROK asserted?

CPU_PWROK - OK
FBVDDQ_PWROK - OK
EC_SYS_PWROK -OK
ALW_PWRGD - OK
VR_PWRGD - OK
NVDD_PWRGD - OK
VGA_PWRGD - OK

CPU 1,1V
GPU 0,75V
VRAM: 1,21V
RAM: 1,23V
All other coils have normal voltage as well


Something is strange.
CPU_PLT_RST1_N = 3,3V but CPU_PLT_RST_N is 0V how can this be?