Lenovo Ideapad 100-15IBD Help (NM-A681 CG510)

[CeeEee4]

Hi guys

im pretty new to repairing things to this level and was wondering if you could help out. I have a Lenovo Ideapad 100 15-IBD that doesnt boot up.

fan spins 1/4 when the power button is pressed.

current use when plugged in 0.01ma
current use when button pressed is 0.08ma

Battery charges ok, DC in has 20V and i have 3.3V and 5V on their respective coils. here are the readings from the EC with the power on sequence.

EC IT8586E

PIN - NAME - PLUGGED IN / PWR BUTTON PRESSED
----------------------------------------------------------------------------
110 - ON/OFF - 3.3V / 1.6V
76 - NOVO# - 3.3V
11 - VCC - 0V / 3.3V (for 1 second then back to 0V?)
74 - AVCC - 3.3V
97 - PCH_PWR_EN - 3.3V
93 - EC_RSMRST# (PCH_RSMRST#) - 3.3V / 3.3V (does not go low?)
86 - PBTN_OUT# - 3.3V / 2.6V (does it need to go low to 0V or just lower than 3.3V?)
18 - PM_SLP_S3# - 0V / 0.5mv
21 - PM_SLP_S4# - 0V / 1.6V (then straight back to 0V)
107 - SYSON - 0V / 3.3V (then back to 0V)
34 - SUS_VCCP - 04.1mv / 06.9mv
124 - SUSP# - 0V / 3.3V (for a second then back to 0V)
125 - VR_ON (EC_VR_ON) - 2.75V / 2.79V
99 - PCH_PWROK - 0V / 3.4V (for 1 second)
30 - SYS_PWROK - 0V / 3.4V (then back to 0V)

hopefully someone can help. thanks

[angel-boy]

Re: Lenovo Ideapad 100-15IBD Help (NM-A681 CG510)

First replace bios dump , and IT8586E is programmable , so first check this .

[CeeEee4]

Re: Lenovo Ideapad 100-15IBD Help (NM-A681 CG510)

Hi angel-boy

Thanks for your help.

i can flash the BIOS with eeprom programmer.. but how do i flash the EC? and firmware for IT8586E?

thanks

[CeeEee4]

Re: Lenovo Ideapad 100-15IBD Help (NM-A681 CG510)

I flash BIOS but no change.

When power button pressed, fan spins 1/4. I got voltage on RAM coil, CPU/PCH coil for only 1 second then it goes off again.

Any ideas?

[amby127]

Re: Lenovo Ideapad 100-15IBD Help (NM-A681 CG510)

Hi gud day Newbie here, ^_^

im working also same this mboard im just confused in PQ39 N-CHANEL MOS. this is the image the problem. https://i.imgur.com/ciOvP4h.png when this mosfet is in mboard it open to grnd No power, and i try to remove this mos i've got power but no display. My question is PU908 ok or bad?because i dont have yet replacement for this ,the gate pin 4 is 4.2volts higher than drain is 2.6volts and the 1-3 pin is goes to GND BTW thanks in advance try to reflash bios no luk -_-

[szabyyn]

Re: Lenovo Ideapad 100-15IBD Help (NM-A681 CG510)

have the same problem with this type of motherboard
Have u find any solutions?

BR
Szabi