Hello Friends
I need your help in Dell Latitude e7440 (LA-9591P) diagnostic.
The issue is that laptop doesn't start if power button applied, the power LED on but than off after several seconds, no image appeared on the screen, cooling fan doesn't on.
I have checked power distribution on the motherboard:
+PWR_SRC – 13,6V
+5V_ALW – 5,1V
+3,3V_ALW – 3,3V
+3,3V_ALW_PCH – 3,3V
+3,3V_RTC_LDO – 3,3V
+3,3V_SUS – 0V
+1,35V_MEM – 0V
+5V_RUN – 0V
+3,3V_RUN – 0V
+1,05V_RUN – 0V
+VCC_CORE – 0V
Signals from UC1H (CPU):
SIO_SLP_S0 – 3,2V
SIO_SLP_S3 – 0V
SIO_SLP_S4 – 0V
SIO_SLP_S5 – 0V
SIO_SLP_A – 0V
Signals from MEC5075:
A_ON – 0V
Signals from MEC5048:
SUS_ON – 0V
RUN_ON – 0V
The problem is that I didn't find power on sequences for this motherboard.
Could you please advise power on sequences for LA-9591P.
The avlible schematic is attached.
Thank you.
I need your help in Dell Latitude e7440 (LA-9591P) diagnostic.
The issue is that laptop doesn't start if power button applied, the power LED on but than off after several seconds, no image appeared on the screen, cooling fan doesn't on.
I have checked power distribution on the motherboard:
+PWR_SRC – 13,6V
+5V_ALW – 5,1V
+3,3V_ALW – 3,3V
+3,3V_ALW_PCH – 3,3V
+3,3V_RTC_LDO – 3,3V
+3,3V_SUS – 0V
+1,35V_MEM – 0V
+5V_RUN – 0V
+3,3V_RUN – 0V
+1,05V_RUN – 0V
+VCC_CORE – 0V
Signals from UC1H (CPU):
SIO_SLP_S0 – 3,2V
SIO_SLP_S3 – 0V
SIO_SLP_S4 – 0V
SIO_SLP_S5 – 0V
SIO_SLP_A – 0V
Signals from MEC5075:
A_ON – 0V
Signals from MEC5048:
SUS_ON – 0V
RUN_ON – 0V
The problem is that I didn't find power on sequences for this motherboard.
Could you please advise power on sequences for LA-9591P.
The avlible schematic is attached.
Thank you.
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