Lenovo Y530 EC chip problem verification

[NitroX5]

Dear Community,

I would need help for the following case:
Lenovo Legion Y530-15ICH - 81FV
BOARD#: EY515/EY517/EY519/EY520 NM-B701 REV: 1.0 2018-03-21

Problem: device went off during office work. (no hard game playings before). No LEDs, no charging, nothing. Analisys showed the IT8226 SIO 3.3v is shorted, therefore I oredered a pre-programmed one from a reputative seller electronicloop.
After replacement 3.3v got available but I still have no LEDs, no charging circuit voltage...nothing.
The EC soldering verified dozen of times -no moving or shorted legs each other- and couple of the board components from many aspects but no issues found. (measurement list attached)
Background: this board has to have in S5-S4 State 3&5VALW with only AC!
Currently the bare board takes 39mA on AC: PCH, LAN chip and 3/5rail mgmt chip(31C°). 19V main rail is OK.
See no shortage on coils and ohm readings are fine. 1050TI GPU-1ohm and 8Gen CPU-2ohm.
I do have only 3VALW, also 3.3v on BIOS pin but no 5VALW. SIO trigger for 5VALW(EC_ON_5V) is not initiated. (NO shortage)
If I inject voltage for EC_ON_5V enable pin then I get 5VALW and it remains afterwards, but still no change for LEDs, startup or anything.
Core BIOS tried to re-flash from Lenovo website. No change.
My assumption the EC firmware/BIOS is not the proper one or faulty, but the dealer sais it is 100% right.

Is there anything else worth to check and rule out possible HW fault?
I am stuck at this point, feel free to ask details I am appreciate any help.
(Planning to order RT809H EC programmer and follow this thread to reprogram the EC:


Thank you in advance!

[Mod. Edit] Schematic -> https://www.badcaps.net/forum/troubl...ematic-request

Reminder: rules and organization of this section
https://www.badcaps.net/forum/showthread.php?t=117483

[mcplslg123]

What is the resistance to GND on EC_ON_5V? Yes you're right in concluding that 3V/5V ALW rail should be present in off condition in this board with AC adapter connected. What is the resistance to GND on pin13 of PU601? Is 5V present there? Resistance to GND on PL601?

EC firmware may be issue but lets assume the vendor is right in his claim and try to diagnose.

[NitroX5]

What is the resistance to GND on EC_ON_5V? Yes you're right in concluding that 3V/5V ALW rail should be present in off condition in this board with AC adapter connected. What is the resistance to GND on pin13 of PU601? Is 5V present there? Resistance to GND on PL601?

EC firmware may be issue but lets assume the vendor is right in his claim and try to diagnose.

Hi,

EC_ON_5V - 800Kohm
PU601 13# - 5V present (+5VLP or +5_LDO)
PL601 - 13.6Kohm

(As mentioned, if I manually pull EC_ON_5V high, then I get +5VALW)

[NitroX5]

Bring up the thread just to give it a resolution.
My assuption was right: the EC chip which was ordered from Electorincloop has missing or wrong firmware.
I ended up to get a donor laptop and desoldered the SuperIO from there. (did not want to get EC programmer for thousands of $)
Bingo, after 30mins I got my laptop up and running again.

(the situation was really silly since ElectronicLoop has good feedback, their products are pre-tested (they promised) still I was unable to move forward or re-order again. I did not want to blame them but I was totally stuck)

[piernov]

Did you try to contact them about this issue? Electronicloop should be ok, but it's always possible they made a mistake, maybe you can return the problematic IC. Preventing this mistake from happening would also help other people buying from them in the future.

[NitroX5]

Sure I did as first step.
No point to argue about that, they state their side: 100% working and verified chip was sent out.
Despite all the evidence and my assumption there was no point to force furher any discussion.
(remote support offered for 40€ /0.5hr)
Maybe I contact them again to inform about my conclusion. I doubt this worth any further effors from any sides. Bad luck