Hello my friend.
Dell Latitude E5540 LA-A101P power On than Off after 5 seconds.
At first i find a burned Capacitor PC437 ,after desoldered try to power on , laptop is on , fan spinning , 0.440 amp taken ; 5 seconds and he is
Off.
With diode mode try to find any short at all coils , but all is OK.
In this 5 seconds try to take the voltages :
Pl 400 = 19V
PL 401 = 13.65v
Pl 52 = 3.3v
PL 53 = 5.21v
PL 51 =13.65v
PL 100 = +1.35V_MEN_P
PL 150 = +1.05V_MP
PL 300 =+VCC_CORE = 1.7V
PL 200 = +1.5V_RUNP
Bios PIN 8 = 3.33v
PQ 400 = D=19v...G=0v !...S= 19v
The gate here must be Low !
U46 = +3.3V_RUN/+5V_RUN present
U43 = +3.3V_ALW_PCH/+1.05V_RUN present
U45 = +3.3V_SUS/+3.3V_M present
UC3 = PCH_PLTRST#_EC = 3.3vTry to flash bios (3 chip ) same issue too !
What would i check too !!
Dell Latitude E5540 LA-A101P power On than Off after 5 seconds.
At first i find a burned Capacitor PC437 ,after desoldered try to power on , laptop is on , fan spinning , 0.440 amp taken ; 5 seconds and he is
Off.
With diode mode try to find any short at all coils , but all is OK.
In this 5 seconds try to take the voltages :
Pl 400 = 19V
PL 401 = 13.65v
Pl 52 = 3.3v
PL 53 = 5.21v
PL 51 =13.65v
PL 100 = +1.35V_MEN_P
PL 150 = +1.05V_MP
PL 300 =+VCC_CORE = 1.7V
PL 200 = +1.5V_RUNP
Bios PIN 8 = 3.33v
PQ 400 = D=19v...G=0v !...S= 19v
The gate here must be Low !
U46 = +3.3V_RUN/+5V_RUN present
U43 = +3.3V_ALW_PCH/+1.05V_RUN present
U45 = +3.3V_SUS/+3.3V_M present
UC3 = PCH_PLTRST#_EC = 3.3vTry to flash bios (3 chip ) same issue too !
What would i check too !!
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