EDM-010
TPS5319A burnt and capacitor cracked.
Actions performed:
-
Removed the damaged capacitor
-
Removed TPS5319A
-
The removed capacitors have not been replaced yet
Connected bench power supply to verify the 12V rail and suddenly F7003 fuse blew.
Findings:
- Short circuit on the right side of F7003
Further troubleshooting:
-
Removed F7003 fuse
-
Injected 1V / 1A
-
DA9065 Dialog became extremely hot
Actions:
-
Removed DA9065 → short circuit disappeared
-
Replaced F7003 fuse
-
Replaced DA9065
-
Replaced TPS5319A with compatible M043
Current result:
-
5V present at F7003
-
5V present on 1R0 coil
However:
TPS5319A:
-
Pin 16 = 1.1V instead of expected ~1.98V
-
Pin 13 = 2V instead of expected 5V
DA9065:
-
No 3.3V output
-
No 1.95V output
Southbridge already replaced previously.
At this point the SB appears dead, but I’m wondering if it may simply not be powered.
One more thing that I do not understand:
Before connecting the bench power supply, the F7003 line was completely fine with no short present. TPS5319A had already been removed, the pads were clean and there were no solder bridges.
I cannot understand how current could have reached that side and caused F7003 to blow with TPS5319A removed.
Any suggestions?
(The first photo is of the burned F7003)
