Acer e1-431 dead no power led, no PWROK_EC

[crot69]

hi, I have problem with this laptop, it won't turn on, no led are on but power button have voltage 3.3v
already replaced KBC, DNBSWON# still 0v, Bios already flashed and it still dead.

voltage measured:
VIN = 19V
3VPCU = 3.3V
5VPCU = 5.1V
MAINON = 6.35V
MAIND = 0V
15V = 13.5V
15V_ALWP = 13.47V
S5_ON = 2.5V
+A3VPCU = 3.3V
+3VPCU_EC = 3.3V
ACIN = 3.3V
RTC_RST# = 3.3V
+3V_RTC = 3.3V
S5D = 0V
BATLED0# = 2V
BATLED1# = 1.5V
NBSWON# = 3.3v, when pressed 0v
DNBSWON# = 0v, when NBSWON#=0v or 3.3v
PWRLED# = 1.5V
SUSB# = 0v
SUSC# = 0v
LID591# = 3.3V
PCH_RSMRST# = 0V
PWROK_EC = 0v
SUSLED#=1.5V

MOD Edit: Link to Schematic - https://www.badcaps.net/forum/showthread.php?p=1258885
Reminder: rules and organization of this section - https://www.badcaps.net/forum/showthread.php?t=117483

[mon2]

Re: Acer e1-431 dead no power led, no PWROK_EC

To me, the following do not look to be correct values:

MAIND = 0V (?)
15V = 13.5V - too low
15V_ALWP = 13.47V - too low
S5_ON = 2.5V (?)
SUSB# = 0v
SUSC# = 0v
LID591# = 3.3V
PCH_RSMRST# = 0V - stuck in reset mode
PWROK_EC = 0v - power is NOT ok for the EC

[mcplslg123]

Re: Acer e1-431 dead no power led, no PWROK_EC

PWROK_EC will come at amuch later stage,so not of concern now. PCH RSMRST# should be 3V.Unless its so,you wont get any response from PCH. In my opinion 15V rail showing 13.5V is ok. S5_ON should be 3.3V

[crot69]

Re: Acer e1-431 dead no power led, no PWROK_EC

S5_ON still 2 5v, even though kbc are removed, in multimeter when set buzzer mode it doesn't show any short.
R141 also good (it measured 10K, same like schematic)
PCH_RSMRST# still 0v

[Udemzy]

Re: Acer e1-431 dead no power led, no PWROK_EC

Check the impedance of Rsmrst #, I kinda think this is a pch fault issue. The DNBSWON# 0v gives a glue.

[crot69]

Re: Acer e1-431 dead no power led, no PWROK_EC

PCH_RSMRST# resistance ~9.8Kohm