A3113 / 820-03285 5v ppbus 12v

yair37 · Wednesday at 10:30 AM

no water damage
ppbus_aon 12v
cahrger 5v 0.4a
no short on board.
no dfu mode.
LDO looking good.

2informaticos · Wednesday at 11:15 AM

Both USBC ports with exact same behavior?
Do you mean all U8100 & U7700 LDOs are stable?

yair37 · Wednesday at 2:29 PM

yes both USBC ports are the same behavior..i will check also on u8100 and u7700, i was check just around UF5...

yair37 · Friday at 9:59 AM

PP3V3_S2_LDO 0v no short(0.500)
PP1V5–LDOINT 0v no short

yair37 · Friday at 10:09 AM

PP1v5_LDOINT_MPMU 0v no short
PP1V5_LDOINT_SPMU 0v no short

2informaticos · Friday at 10:18 AM

None of U8100's LDO present?
LDO11 is derived from a buck, but all other LDOs must be present at same time with 3V8_AON.

yair37 · Friday at 11:50 AM

yes...there is just 2 on u8100:
PP1v5_LDOINT_MPMU and PP3V3_S2_LDO do i miss something...

2informaticos · Friday at 8:49 PM

Discarding "NC" marked ones, you still have more to check; page 44, VLDO2/7/8/9/10.

yair37 · 2026-04-05T12:40:56+0100

PP3v8_AON - 3.8v
PP1v25_s2 - 0v
PP1V05_S2SW_VDD2H - 0v
PP1V8_AON - 0v
PP1V2_AWAKE_PLL - 0v
PP0V855_S2SW_CIO - 0v
PP1V2_S2_CIO - 0v

yair37 · 2026-04-05T12:58:10+0100

PP1v8_AON is 1.8v no 0v...all the AON correct

2informaticos · 2026-04-05T16:14:13+0100

Check diode mode to ground on missing LDOs.

Also check voltage and diode mode on U7700's LDOs.