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

[davidebeatrici]

Both 0V and OL. How's the continuity/resistance to ground in your case?

I'll check the following signals:

[davidebeatrici]

So... I checked the oscillator pins on the original CPU and in diode mode to ground there is indeed a voltage drop from ~0.4V to ~0.6V depending on the polarity.

I checked the signals anyway and they're as follows.

EC_RSMRST_R_N: 3.3V
CPU_RSMRST_N: 3.3V
CPU_PLT_RST_N: 1.8V
CPU_PWR_GOOD: 3.3V

I'm confident the processor is soldered correctly and I also confirmed continuity to one of the 4 oscillator pins...

[questore]

So... I checked the oscillator pins on the original CPU and in diode mode to ground there is indeed a voltage drop from ~0.4V to ~0.6V depending on the polarity.

I checked the signals anyway and they're as follows.

EC_RSMRST_R_N: 3.3V
CPU_RSMRST_N: 3.3V
CPU_PLT_RST_N: 1.8V
CPU_PWR_GOOD: 3.3V

I'm confident the processor is soldered correctly and I also confirmed continuity to one of the 4 oscillator pins...

I will check them when I'll be at my desk.

[davidebeatrici]

I got a working Rev 2.0 from another 16ACH6H, with a broken screen that stays black. I can measure a voltage drop in diode mode to ground on all oscillator pins and the CPU warms up way before the GPU does.

This confirms the CPU I was sent is indeed dead. I just bought a stencil for the CPU, I'll let you know how it goes when I solder the original back on.

[questore]

I got another 16ACH6H, that POSTs but with a black screen. I can measure a voltage drop in diode mode to ground on all oscillator pins and the CPU warms up way before the GPU does.

This confirms the CPU I was sent is indeed dead. I just bought a stencil for the CPU, I'll let you know how it goes when I solder the original back on.

Meter in diode mode YC1 has 0.748 Voltage drop on both sides to ground , YC2 has 0.746 on one an 0,830 on the other side

[questore]

My measurements:
EC_RSMRST_R_N: 1.7V
CPU_RSMRST_N: 1.7V
CPU_PLT_RST_N: 0V
CPU_PWR_GOOD: 3.3V
I still think its and EC firmware

[davidebeatrici]

Meter in diode mode YC1 has 0.748 Voltage drop on both sides to ground , YC2 has 0.746 on one an 0,830 on the other side

I get ~0.75 on all four but I think your measurements are good.

My measurements:
EC_RSMRST_R_N: 1.7V
CPU_RSMRST_N: 1.7V
CPU_PLT_RST_N: 0V
CPU_PWR_GOOD: 3.3V
I still think its and EC firmware

Interesting how the RSMRST signals seem to be floating in a half state. Not pulled up nor down, a quantum paradox basically!

Let's see if they change once you flash the correct EC firmware.