Hello
I need help to repair my PC.
My PC HP does not start, no light on DC Jack LED, no power consomption (only 1,3 mA).
I don't have 3.3V.
On PU11 :
#1 EN1 0,5V
#2 PGOOD - 0V
#3 FB -0V
#4 VOUT - 0V
#5 VCC -0.5V
#6 BST -0.0V
#7 LDO - 5.36V
#8 VIN - 19V
#9 GND - 0V
#10 SW -0V
EN2 is too low to active the chip !!!
#EN2 is connected to SIO S5_ON so S5_ON is bad.
On U11 (SIO) :
#AD_AIR = 0,93V
#AD_TYPE = 0,74V
#S5_ON = 0,5V
#P11(+3V) = 0,3V
#P121(+3VPCU) = 0,5V
Signal AD_ID = 0,66V when connected to motherboard or 18,2V when disconnected. Is it normal ?
I check R294, R298 ans R304 and values are good. No shortcut for C383 and C386.
Other value on the motherboard :
+VA = 19,5V
+VAD= 19,5V
+VA_AIR = 19V
I have checked PR144, PR143 and PC66 and they are good. I don't understand why AD_AIR is too low.
It should not be 19 * PR143 / (PR143+PR144) = 2,7V ?
Motherbord schematic
I need help to repair my PC.
My PC HP does not start, no light on DC Jack LED, no power consomption (only 1,3 mA).
I don't have 3.3V.
On PU11 :
#1 EN1 0,5V
#2 PGOOD - 0V
#3 FB -0V
#4 VOUT - 0V
#5 VCC -0.5V
#6 BST -0.0V
#7 LDO - 5.36V
#8 VIN - 19V
#9 GND - 0V
#10 SW -0V
EN2 is too low to active the chip !!!
#EN2 is connected to SIO S5_ON so S5_ON is bad.
On U11 (SIO) :
#AD_AIR = 0,93V
#AD_TYPE = 0,74V
#S5_ON = 0,5V
#P11(+3V) = 0,3V
#P121(+3VPCU) = 0,5V
Signal AD_ID = 0,66V when connected to motherboard or 18,2V when disconnected. Is it normal ?
I check R294, R298 ans R304 and values are good. No shortcut for C383 and C386.
Other value on the motherboard :
+VA = 19,5V
+VAD= 19,5V
+VA_AIR = 19V
I have checked PR144, PR143 and PC66 and they are good. I don't understand why AD_AIR is too low.
It should not be 19 * PR143 / (PR143+PR144) = 2,7V ?
Motherbord schematic
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