Anand salunke
Registered member
Hey guys,
ACER 5740 (motherboard JV50-CP MB 09285-1M) does not turn on and no display.
When power button is pressed, power leds turn on, exactly after 1 second, they turn off.
I checked all voltages and they seem fine, when power button is pressed. PLTRST is also fine.
Exactly after one second from turn on, it looks that SLP_S3# and SLP_S4# are turned off by PCH causing system off. All powergood signal is OK.
I have downloaded BIOS from ACER website and flashed, but the set still does not turn on. I have also reflowed the PCH HM55, but no luck.
I also tried HM55 replacement, but symptoms are still the same.
Another interesting observation is that the SIO/KBC does not pull up RSMRST to PCH upon power button press, is this normal on this board?
ACER 5740 (motherboard JV50-CP MB 09285-1M) does not turn on and no display.
When power button is pressed, power leds turn on, exactly after 1 second, they turn off.
I checked all voltages and they seem fine, when power button is pressed. PLTRST is also fine.
Exactly after one second from turn on, it looks that SLP_S3# and SLP_S4# are turned off by PCH causing system off. All powergood signal is OK.
I have downloaded BIOS from ACER website and flashed, but the set still does not turn on. I have also reflowed the PCH HM55, but no luck.
I also tried HM55 replacement, but symptoms are still the same.
Another interesting observation is that the SIO/KBC does not pull up RSMRST to PCH upon power button press, is this normal on this board?