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820-00281 No spill, swollen battery 5V on USB
- Thread starter bjf
- Start date
Do you get 5V at R7020?
Post U6903 voltages.
Compare diode mode readings on the power rails of all CD3215 chips.
Post U6903 voltages.
Compare diode mode readings on the power rails of all CD3215 chips.
bjf
Member
After sitting for weeks, the first time I plugged it in, it went up to 20V and the CPU heated up. By the time I started testing for voltage is was back down to 5V.
U6903 Voltages:
1 0
2 5V
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
Pins 1 and 8 had some very small amount of varying voltage.
PP5V_S4_X_USBC is measuring around .160 in diode mode whereas PP5V_S4_T_USBC is measuring .220 and PP5V_S4_X_USBC on a good board I have measures .220. Not sure it that would be enough to be concerning but that?s the only difference I can find in diode mode on the power lines around the CD3215 chips.
U6903 Voltages:
1 0
2 5V
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
Pins 1 and 8 had some very small amount of varying voltage.
PP5V_S4_X_USBC is measuring around .160 in diode mode whereas PP5V_S4_T_USBC is measuring .220 and PP5V_S4_X_USBC on a good board I have measures .220. Not sure it that would be enough to be concerning but that?s the only difference I can find in diode mode on the power lines around the CD3215 chips.
I was thinking about LDO outputs of CD3215 chips.
"U6903 Voltages:
-------
10 0"
R6921 is OK?
"U6903 Voltages:
-------
10 0"
R6921 is OK?
CD3215 has 3 types of LDO outputs; 1.1V, 1.8V and 3.3V.
I doubt you get exactly same 495 value on all.
Looks like U7000 issue.
Check first TBA_AUX_DET and TBA_VDDA/P.
I doubt you get exactly same 495 value on all.
Looks like U7000 issue.
Check first TBA_AUX_DET and TBA_VDDA/P.
bjf
Member
Ok, got it, didn't realize there were so many. I checked the other LDO outputs. They're the same for each CD3215. .480 .470 and .495. No outliers.
TBA_AUX_DET is at 1.28 V and TBA_VDDA/P are at 2.3V. After letting it sit overnight, it did go back up to 20V again the first time I plugged it in. No current though. TBA_AUX_DET and TBA_VDDA/P were at 5V when it first turned on with 20V.
TBA_AUX_DET is at 1.28 V and TBA_VDDA/P are at 2.3V. After letting it sit overnight, it did go back up to 20V again the first time I plugged it in. No current though. TBA_AUX_DET and TBA_VDDA/P were at 5V when it first turned on with 20V.