820-3115 pp5v_s3 short

Kyle93

Member
Board is in perfect condition. No drop or liquid damage. PP5V_S3 is shorted at 0.47. When injecting voltage the only component that gets hot is L7260. Removed but short is still there.

What should be checked next?
 

2informaticos

Administrator
Staff member
"PP5V_S3 is shorted at 0.47"
Do you mean diode mode, or ohm scale?
0.47 in ohm scale is short for sure.
0.47 in diode mode is around 1 kohm...
Please post accurate information.

Do you get 3V3_S5/SUS and 5V_S5?
 

2informaticos

Administrator
Staff member
"yes, diode mode"
Why did you assume is short then???

Post exact PPBUS_G3H, SMC_RESET_L, SMC_PM_G2_EN (voltages).
Do you get 3V42_G3H?
 

Kyle93

Member
On a working board the measurement was 0.318

PPBUS_G3H 12.60v

SMC_RESET_L 3.42v

SMC_PM_G2_EN 3.42V

Yes 3V42_G3H 3.42V
 

2informaticos

Administrator
Staff member
0.318 is lower, how could 0.47(0) be short???

Post U7200 voltages; pins 16, 3, 13, 8, 17, 1, 6.
Also post diode mode readings at L7220/60.
 

Kyle93

Member
u7200

pin 16 12.60V

pin 3 0.015V

pin 13 3.4V

pin 8 0.03 V

pin 17 0.015V

pin 1 0v

pin 6 0v

L7220 0.129

L7260 0.025
 

Kyle93

Member
u7200 changed

pin 16 12.60V

pin 3 2.009V

pin 13 3.4V

pin 8 03.3 V

pin 17 4.97V

pin 1 0v

pin 6 0.839v

L7220 0.120

L7260 0.128
 
Top