ASUS VivoBook 15 X512DK NO power

[javieromex]

There is no schematics/bv for this MB but I was able to find some files for reference.

I replaced and programmed 2 times the ITE with same issue: Not turning on.

5VA and 3VA ok and steady.

IT8225E:
+3VA_EC: 3V
+3VPLL: 3V
+3VS: 3V
+3VSUS: 3V
+3VACC: 3V

LID_SW#:3V
WRST#/O_EC_RST#: 3V
AC_IN_OC#:3V
PM_RSMRST#_EC:3V
PWR_SW#: 3V (Goes 0 when pushing)

PM_PWRBTN#: 3V (I do see the "ignition" pulse")

---------------------------------------------------------
After this I think the Ram voltaje should start right?
---------------------------------------------------------
RAM VOLTAGE IC: UP9002P:

POWER?
P_1.2V_VDD_20: 5V
P_1.2V_VDDP_20: 5v
P_1.2V_CS_10: 5v

ENABLES?
P_1.2V_S3_10: 3.3V
P_1.2V_S5_10: 0V
P_1.2V_TON_10: 17V


+VTT:0V
VTTREF:0V

NO PULSES ON THE COIL
NO PULSES ON THE MOSFETS GATES

Any idea?

Could it be a problem with the EC/MAIN bios??? Anyone could provide a tested EC and main bin?



Thanks!!

[mcplslg123]

Re: ASUS VivoBook 15 X512DK NO power

P_1.2V_S5_10: 0V Are you sure about this?? S5 comes before S3, so should be present. TON voltage seems doubtful. usually this pin has a resistor in the range og 450K-750K ohms. One end of this resistor should be 19V but the other end connected to IC pin should be close to 1V-so do check this resistor.

[javieromex]

Re: ASUS VivoBook 15 X512DK NO power

Hello mcplslg123

P_1.2V_S5_10: 0V yes i am sure.

Checked the resistor and compare with donor board and same value

[mcplslg123]

Re: ASUS VivoBook 15 X512DK NO power

If you are sure about your measurements, replace Ram IC.

[Sephir0th]

Re: ASUS VivoBook 15 X512DK NO power

i have strong doubts about the "P_1.2V_S3_10: 3.3V" then. Please double check here, too

[mcplslg123]

Re: ASUS VivoBook 15 X512DK NO power

i have strong doubts about the "P_1.2V_S3_10: 3.3V" then. Please double check here, too

Right. I highlighted that you have S3 voltage and missing S5 which is beyond my understanding.