HeyWatchOutDude
Member
My fault other way around …
C5220 = 180k ohms
C5260 = 2.3 ohms
so R5222 and R5221 right?
C5220 = 180k ohms
C5260 = 2.3 ohms
so R5222 and R5221 right?
-
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820-02016 - 5V / 0.02-4 A - No boot
- Thread starter HeyWatchOutDude
- Start date
Yes, check them...
HeyWatchOutDude
Member
Fixed - R5222 was blown replaced it now PPBUS_AON is back on 12.27V.
I noticed that PP3V8_AON_VDDMAIN is just at 2.8V (too low) instead of 3.8V.
Step 1. Check for a short to ground on PP3v8_AON_VDDMAIN. C5887 is a good place to measure from. Normal diode mode to ground reading = ~.350.
- Value: 0.313
Step 2. Check the enable signal to U5700, P3V8_PWR_EN.
- P3V8AON_PWR_EN = 5V
- CHGR_MVR_EN = 5V
Step 3. Ensure that the VIN (PPBUS_AON) is making to U5700. Occasionally a via or trace can break resulting in a voltage not making it to some parts of the board. PPBUS_AON can be measured adjacent to U5700, on C5704 or C5804.
- PPBUS_AON (12.27V) is present on those two caps.
If all above findings are negative for issues, replace U5700.
- Should I proceed with that step or do you have any other idea?
----------------
I might have (accidentally) touched P3V8AON_PVCC and PPBUS_AON with my multimeter (P3V8AON_PVCC is now 0.085) - PPBUS_AON is going from 3V-12V ... I think it's time to replace the U5700....
I noticed that PP3V8_AON_VDDMAIN is just at 2.8V (too low) instead of 3.8V.
Step 1. Check for a short to ground on PP3v8_AON_VDDMAIN. C5887 is a good place to measure from. Normal diode mode to ground reading = ~.350.
- Value: 0.313
Step 2. Check the enable signal to U5700, P3V8_PWR_EN.
- P3V8AON_PWR_EN = 5V
- CHGR_MVR_EN = 5V
Step 3. Ensure that the VIN (PPBUS_AON) is making to U5700. Occasionally a via or trace can break resulting in a voltage not making it to some parts of the board. PPBUS_AON can be measured adjacent to U5700, on C5704 or C5804.
- PPBUS_AON (12.27V) is present on those two caps.
If all above findings are negative for issues, replace U5700.
- Should I proceed with that step or do you have any other idea?
----------------
I might have (accidentally) touched P3V8AON_PVCC and PPBUS_AON with my multimeter (P3V8AON_PVCC is now 0.085) - PPBUS_AON is going from 3V-12V ... I think it's time to replace the U5700....
Last edited:
The M1 processor may be dead now...
HeyWatchOutDude
Member
U8100 and U7700 getting warm after like 20seconds - maybe i just killed the PMUIC and U7700 
(5V / 0.40A)
(5V / 0.40A)
Remove them and check if diode mode on 3V8_AON goes high.