Why do you bother with DFU?
You have missing important LDOs.
Check them in diode mode.
You have missing important LDOs.
Check them in diode mode.
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[help] 820-01958 dead: 20v not switching
- Thread starter phantom
- Start date
i think that the power supply for pm is PP3V3_G3H_PMU_VDDMAIN
how can i pretend to have ldos if PP3V3_G3H_PMU_VDDMAIN is 2,4v????
so i think that before pp3v3 i should have PPBUS_G3H
but PPBUS_G3H is 2,28v!!
and like i read here
PPBUS_G3H is created by the Intersil/Renesas ISL9240 (U7000)
If you are getting 5 V on PPDCIN_G3H, the ISL9240 is likely the cause of the problem
i have already check the current sensors....
so i think i should change u7000 what do you think?|
how can i pretend to have ldos if PP3V3_G3H_PMU_VDDMAIN is 2,4v????
so i think that before pp3v3 i should have PPBUS_G3H
but PPBUS_G3H is 2,28v!!
and like i read here
PPBUS_G3H is created by the Intersil/Renesas ISL9240 (U7000)
If you are getting 5 V on PPDCIN_G3H, the ISL9240 is likely the cause of the problem
i have already check the current sensors....
so i think i should change u7000 what do you think?|
Last edited:
"but PPBUS_G3H is 2,28v"
You've said 12.28V before; good enough for MLB to start.
"PP3V3_G3H_PMU_VDDMAIN is 2,4v"
I also asked and you've said 3.3V (R6979) connected.
You've said 12.28V before; good enough for MLB to start.
"PP3V3_G3H_PMU_VDDMAIN is 2,4v"
I also asked and you've said 3.3V (R6979) connected.
i wrote wrong...
PPBUS_G3H is 12,28.....
and according to this
it is not correct, because it should be 12,6v!
PP3V3_G3H_PMU_VDDMAIN is 2,4v!
you asked me about c6979... it is PP3V3_G3H_RTC_R and i have 3,3v
PPBUS_G3H is 12,28.....
and according to this
it is not correct, because it should be 12,6v!
PP3V3_G3H_PMU_VDDMAIN is 2,4v!
you asked me about c6979... it is PP3V3_G3H_RTC_R and i have 3,3v
Post R7900 voltages (both pins).
Sorry, I was looking at 01598 schematic; mea culpa.
Do not expect 12.6V at PPBUS_G3H until T2 correctly communicates with U7000.
Post U7650 basic voltages: 23, 22, 12, 13, 29, 21, 4.
Do not expect 12.6V at PPBUS_G3H until T2 correctly communicates with U7000.
Post U7650 basic voltages: 23, 22, 12, 13, 29, 21, 4.
i've discovered something (i think ) interesting
if i connect the usb port corresponding to u3200, i have this
https://www.dropbox.com/scl/fi/jpbth...=cffslxna&dl=0
you see? half of u3100 become hotter and a quarter of u 3200 flash...
this trange thing doesn't happen if i connect the cable to u3100
if i connect the usb port corresponding to u3200, i have this
https://www.dropbox.com/scl/fi/jpbth...=cffslxna&dl=0
you see? half of u3100 become hotter and a quarter of u 3200 flash...
this trange thing doesn't happen if i connect the cable to u3100
3V3_G3H_RTC is common rail; it should arrive to U3100 even when connect the charger to U3200 channel.
Compare diode mode readings for LDOs between U3100/200.
Compare diode mode readings for LDOs between U3100/200.
Then check 3V3_G3H_RTC trace to U3100.
Check diode mode to ground on CC1/2 lines.
S-UEM2 tool helps a lot to check J3300 (also J8500).
S-UEM2 tool helps a lot to check J3300 (also J8500).
Did you test with another charger/cable?
yes sure
original power supply
chinese power supply
power bench with by-3200s that doesn't switch to 5v