Anyone here specialized in dell laptops ?
I'm working on a laptop that when powered on , shuts down after 5 seconds and repeats this each time it's powered up. You can hear the HD spinning until the lap shuts down. The fan doesn't spin at all. VCC_CORE , +VCCGT , + VCCSA remain 0V and PWM's at pin 4 PU4701, PU4702 , PU4801 (NCP81382) is 2.0V (Mid state) for 5 seconds at power on and drop to 0V and PWM at pin 2 PU5001 (NCP81253) remains 0V. What I noticed is that CPU pin E32 line which is VCC_SENSE connected to pin 47 from PU4601 (NCP81218) measures 3.5R to GND and if I split the line the short remains at CPU side. Can I conclude that CPU has a short ? Need to figure this out because a new mb is about $350. Thank you.
I'm working on a laptop that when powered on , shuts down after 5 seconds and repeats this each time it's powered up. You can hear the HD spinning until the lap shuts down. The fan doesn't spin at all. VCC_CORE , +VCCGT , + VCCSA remain 0V and PWM's at pin 4 PU4701, PU4702 , PU4801 (NCP81382) is 2.0V (Mid state) for 5 seconds at power on and drop to 0V and PWM at pin 2 PU5001 (NCP81253) remains 0V. What I noticed is that CPU pin E32 line which is VCC_SENSE connected to pin 47 from PU4601 (NCP81218) measures 3.5R to GND and if I split the line the short remains at CPU side. Can I conclude that CPU has a short ? Need to figure this out because a new mb is about $350. Thank you.