Lenovo G50-70 switch on problem

[String2016]

I need help on this LENOVO G50-70 ACLU1/ACLU2 NA -A271 laptop.the problem is turning on then goes off unless you steady the probe to pin 3 and 4 of the power button. here is the voltages on of PINS ON JPWRB1

PIN1 +3VL =3.3V
PIN2 NOVO_BTN# = 3.3V
PIN3 ON/OFFBTN# = 0.94V ONLY
PIN 4 LID_SW# = 3.3V
PIN 5 AND PIN6 = GROUND

I check on kbc ON pin 110 PWRSW# =3.3v and resistors connected =3.3v


ANYONE can help me on this please

[Techtiger]

Re: Lenovo G50-70 switch on problem

what is the voltage on R114 both ? is R114 100K ?

[String2016]

Re: Lenovo G50-70 switch on problem

cannot find where is r114 located does this resistor connected to kbc pin110?

[String2016]

Re: Lenovo G50-70 switch on problem

could you show where is the R114 Located nearby?i cannot find on the board i check there is no boardview for this unit

[SMDFlea]

Re: Lenovo G50-70 switch on problem

check D15 ,diode measurement

[Techtiger]

Re: Lenovo G50-70 switch on problem

could you show where is the R114 Located nearby?i cannot find on the board i check there is no boardview for this unit

check out the Pic

[String2016]

Re: Lenovo G50-70 switch on problem

@smdflea d15 open line

[String2016]

Re: Lenovo G50-70 switch on problem

@techtiger on pin4 connected to that is 3.4v and on the other side one is marked 0 and the other no component on it

[Techtiger]

Re: Lenovo G50-70 switch on problem

@techtiger on pin4 connected to that is 3.4v and on the other side one is marked 0 and the other no component on it

ok then pin 3 should connect to this point , uplode a closeup pic near pin 110 SIO

[ktmmotocross]

Re: Lenovo G50-70 switch on problem

did u check continuity of that 0 ohm resistor?

what u mean d15 open line. it is diode. in one direction open line and in other direction cca 600ohm

[String2016]

Re: Lenovo G50-70 switch on problem

@techtiger here it is the kbc pin 110 and the resistor connected pin110 directly connected to pin 3 on switch both resistor near pin110 have 10k resistance

[String2016]

Re: Lenovo G50-70 switch on problem

@ktmmotocross D15 no component ill measured on diode mode it show nothing and when i measured in ohms it shows 13.96k then goes to nothing

[String2016]

Re: Lenovo G50-70 switch on problem

any help on this please

[mcplslg123]

Re: Lenovo G50-70 switch on problem

Voltage on PIN86 of KBC-without pressing power button/after pressing power button??

[ravi_1617]

Re: Lenovo G50-70 switch on problem

just a simple question will a NM-A272 shifting IO chip (IT8586E )will work on NM A271 ,I don't have a any IO chip programmer.
NM A271 IO chip is has heating problem
Thanks

[mcplslg123]

Re: Lenovo G50-70 switch on problem

@ravi_1617, there are high chances it will work as the firmware of kbc seems same on both motherboard's

[ravi_1617]

Re: Lenovo G50-70 switch on problem

Already swapped. 3.3 & 5 volts present. 3.3 volt at switch also present ,but board not starting, flashed bios too.
Thanks

[mcplslg123]

Re: Lenovo G50-70 switch on problem

Check ECRST and RSMRST present or not??

[ravi_1617]

Re: Lenovo G50-70 switch on problem

Check ECRST and RSMRST present or not??

ECRST not present .RSMST unable o locate any where. i tough of checking with battery power, than found BATT+ showing (20 volts)

[ravi_1617]

Re: Lenovo G50-70 switch on problem

Battery is not charging ,
PQ303 power Present at Source and Gate