+3valw to +3vs on acer laptop problem

[infoplus]

Motherboard: COMPAL LA-3581P (ICW50) Rev 1.0
I have a problem with +3VALW TO +3VS circuit
SUSP = 5v, VSB = 19V, +3VALW = 3V, 5VS=0V

[mielta]

Re: +3valw to +3vs on acer laptop problem

Hi
Remove biosbatterie and then press powerbutton for 60 sec. without ac adapter and Battery.
means make a hardware reset.

[dellxps15]

Re: +3valw to +3vs on acer laptop problem

remove u1 and see if pin 4 of u1 get 19 volt. if yes replace u1.

[infoplus]

Re: +3valw to +3vs on acer laptop problem

I Remove U1 and i get no think This problem is strange....

[khaahk]

Re: +3valw to +3vs on acer laptop problem

Everything is ok for S5 state.
After powerbutton pressed KB926 should pull SUSP# high, meaning SUSP is going low and U1 gate will get 19V to open 3VALW to 3VS.
This mainboard has the famous MCP67 from nvidia. Maybe the ec is not getting answer from MCP and does not give command to change power state.

[infoplus]

Re: +3valw to +3vs on acer laptop problem

I think that i have a short to ground in this lines:
+3vs, +1.8vs, +1.2vs where is the problem exactly

[khaahk]

Re: +3valw to +3vs on acer laptop problem

Why do you think that?
What do you call short to gnd? How many ohms?

[infoplus]

Re: +3valw to +3vs on acer laptop problem

0 ohms and in power supply it show me that there is a short

[khaahk]

Re: +3valw to +3vs on acer laptop problem

Then use lab psu to find the short, if needed on all lines.