Lenvo ideapad 100- 15IBD No display

[asem18]

Hello everyone
Lenvo ideapad 100- 15IBD (NM-A681 CG510) cpu i3
Issue : No display

When i push power button fan spin ,all Volt is ok , Power consumption stuck on 0.25 amp .

- 3/5V always is ok
- 3/5Vs is ok
- 1.35V is ok
- 1.05v is ok
- Cpu core 1.8v at Pl9
- +LCDVDD_CON is 0V---PCH_ENVDD = 0v (U5)
- Pltrst is 3.3v at pin 22
- 1.5 Vsp/Vs is ok
- CPU_DRAMRST# is 0V

Flashing Bios same issue

Some Volt On ite 8586e before/after pushing power button

110 - ON/OFF - 3.3V / 3.2
76 - NOVO# - 3.3V / 3.3
26 - VCC - 3.3V / 3.3
74 - AVCC - 3.3V / 3.3
97 - PCH_PWR_EN - 3.3V / 3.3
93 - EC_RSMRST# (PCH_RSMRST#) - 3.3V /
86 - PBTN_OUT# - 3.3V / 3.3
18 - PM_SLP_S3# - 0V / 3.3
21 - PM_SLP_S4# - 0V / 3.3
107 - SYSON - 0V / 3.3
34 - SUS_VCCP - 03.3V / 3.2
124 - SUSP# - 0V / 3.3
125 - VR_ON (EC_VR_ON) - 2.5V / 2.48
99 - PCH_PWROK - 0V / 3.3
30 - SYS_PWROK - 0V / 3.3

I Use Lenovo IdeaPad 100 series LCFC NM-A681P CG510 rev 0.2 schematic , no BRD available .

Any other suggestions to do !!

[asem18]

Re: Lenvo ideapad 100- 15IBD No display

Things get more better :grinning: change another good ram ddrl3 , flash bios too...CPU_DRAMRST is 1.3v ,Power consumption reach 0.33 amp...few seconds 0.40 amp , a light on screen ,just to see Lenovo logo and it will restart from 0.33 amp..ans repeat the same steps...any others suggestions please

[mcplslg123]

Re: Lenvo ideapad 100- 15IBD No display

Are you sure the bios you flashed is good??Is the system stable without ram stick inserted??

[asem18]

Re: Lenvo ideapad 100- 15IBD No display

yes , bios and ram are ok ..take all the voltage on LCD POWER CIRCUIT connector , find that all is ok ..so i just change the laptop screen and all is good...thank you for your help

[openminded]

Re: Lenvo ideapad 100- 15IBD No display

yes , bios and ram are ok ..take all the voltage on LCD POWER CIRCUIT connector , find that all is ok ..so i just change the laptop screen and all is good...thank you for your help

are you sure it was the screen?
I had the same behaviour, got it to work by decoupling CMOS battery and shorting battery pins for a few seconds.

[Zilicon]

Re: Lenvo ideapad 100- 15IBD No display

are you sure it was the screen?
I had the same behaviour, got it to work by decoupling CMOS battery and shorting battery pins for a few seconds.

Was it CMOS battery pins you shorted or the system battery?

I'm currently having the same challengs. the system behaviour remains the same regardless if RAM is installed or not. The fan runs a little and stops, the CPU gets very hot. No display whatsoever

[fauzanmint]

Re: Lenvo ideapad 100- 15IBD No display

Can someone explain me the function of CPU_DRAMRST# pin?