Hi, another Asus n551jk rev2 with no video issue. This time post is not completed.

It drains 800 mili amperes from bench psu, and shows no data on debug card, only dot led is on. (it is a ddr3 debug card for asus mobo)

All voltages are present, but +VCCIN for cpu is 1.8v instead of 1.7v. (no much difference but not correct in my opinion)

There are no pulses in SMB_CLK_S and SMB_DAT_S for ddr3 I2C bus, but SMB1_CLK_S and SMB1_DAT_S for CPU_THERM# reading are present.

I think the pch is not working properly, but i'm not sure.

Main bios have been flashed 3 times with different dumps.

Is there any checking to do before changing the pch?

Reset pciex, cpu, ddr.
Биос вычитывается?
Сопротивления по data usb?

Readings at usb connectors are good, diode readings are normal and ohms readings are about 1.5 Mohms.

PLT_RST# and DRAMRST#_R are both high level.

FBB_CMD5 (reset signal for video rams (U7301 to U7304)) is always at low level. (measured at pin 1 of R7321)****

What pciex signal should I test?

Thanks for your help.

****(probably due to not post being completed)

CPU_RST#
CPU_FC_PWROK
H_CPUPWRGD_R
SM_DRAMPWROK

Hi, these are the readings:

CPU_RST#---1.07v
CPU_FC_PWROK----0v
H_CPUPWRGD_R----1.065
SM_DRAMPWROK----0.889

SM_DRAMPWROK have a weird level. Diode reading is normal but ohms readings is only 1480 ohms, seems a weird value too.

By the way, CPU_FC_PWROK seems not to be connected to anything, diode mode and ohms have a infinite value.

I will have a look to SM_DRAMPWROK circuit and tell the results.

Thanks.