Are there any method to confirm a dead PCH or SuperIO.
Announcement
Collapse
No announcement yet.
Dead Dell Inspiron 14r N4010 (Used to beeps 3 times but no longer do)
Collapse
This topic has been answered.
X
X
-
Originally posted by mcplslg123 View PostIts too early to jump to a conclusion. you've notfollowed the basic troubleshooting procedure and jumped the gun. Wiser to stick to basics.
Meaure resistance to GND on all coils
Measure voltage on all coils .
PL3: 0.7V 0.7V
PL4: 0.7V 0.7V
PL7: 0.8V 0.8V
PL10: 0.76V 0.7V
PL8: 0.78V 0.79V
PL6 (This one gets warm): 0.76V 0.77V
PL11: 0.8V 0.8V
PL9: 0.76V 0.71V
PL5: 0.65V 0.65V
Comment
-
Originally posted by mon2 View PostThe posted values are the voltage to ground only. Do share the resistance to ground values as well.
Meter in resistance (lowest) scale. No power to the board. One meter probe on the coil to test (either side is ok); other meter probe to ground. Post the resistance in ohms for each.
Comment
-
Originally posted by mon2 View PostAlmost the same method. Meter in dc volts scale.
Black meter probe to ground. Shield is ok.
Red meter probe to coil / inductor to test. Apply power to the board if testing voltage to ground.
Comment
-
Originally posted by mon2 View Post
Comment
-
Originally posted by mon2 View Post
Comment
-
Originally posted by mon2 View PostAlmost the same method. Meter in dc volts scale.
Black meter probe to ground. Shield is ok.
Red meter probe to coil / inductor to test. Apply power to the board if testing voltage to ground.
Comment
-
Originally posted by mon2 View PostMeasure again the voltage to ground of each pin on mosfet PQ20 - check 1-2-3 (source); check 4 (gate); check 5-6-7-8 (drain).
PQ20 readings:
Pin 1,2,3,5,6,7,8: 19.44V
Pin 4: 1.752V
Comment
-
This confirms that PQ20 is being enabled and the main power rail is receiving the proper voltage from the power adapter.
Remove all power. Meter now in resistance mode. Short the meter probes and the measurement should be ~ 0 ohms.
Connect one meter probe to mosfet PQ20 pin 1-2-3 and other probe to any inductor on the board.
If you have a low resistance, then stop and note the location. A low resistance means the high side mosfet has leaked and probably caused damage.
Check the inductors near the CPU and other regions.
Comment
-
Originally posted by mon2 View PostThis confirms that PQ20 is being enabled and the main power rail is receiving the proper voltage from the power adapter.
Remove all power. Meter now in resistance mode. Short the meter probes and the measurement should be ~ 0 ohms.
Connect one meter probe to mosfet PQ20 pin 1-2-3 and other probe to any inductor on the board.
If you have a low resistance, then stop and note the location. A low resistance means the high side mosfet has leaked and probably caused damage.
Check the inductors near the CPU and other regions.
Comment
-
Originally posted by mcplslg123 View PostPQ19,pin3 voltage?
RUN_ON present after pressing power button?
RSMRST# present?
RUN_ON when not pressing power button: 4.33V
When pressed: 0V
PQ_19: Pin 1: 11.66V
Pin 2: 13.86V
Pin 3: 0V
RMSRT#: 1.43V
Comment
Comment