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820-02020 Corrosion around UC300, UP700

T

Thomas2020

Member
Hello.
UP700 disassembled because I do not have (he made a short circuit on PP5V_S2)

two usb C ports take --5.04V 0.27A
PPBUS_AON --12.3V
PP3V8_AON-- 0.06V (red to ground) --164 OHM, --0.165 diode mode
PP5V_S2-- 0V
PP3v3_S2_UPC-- 0v
PP1v25_S2-- 0v
PPDCIN_AON_CHGR_R --5.16v why ?? (no difference to which port the charger is connected to)
PP3v3_UPC0_LDO -- 3.3v
PP1v5_UPC0_LDO_CORE --1.5v
PP3v3_UPC1_LDO --3.3v
PP1v5_UPC1_LDO_CORE -- 1.5v

DFU mode does not start
what creates the signal PP3V8_AON ?
what is the startup procedure?
where can I find her?


"I need a fishing rod, not a fish"
 
2informaticos

2informaticos

Administrator
Staff member
"PPDCIN_AON_CHGR_R --5.16v why ?? (no difference to which port the charger is connected to)"
Is normal, R5220 receives voltage from both USB-C ports.

Do you get CHGR_EN_MVR and P3V8AON_PWR_EN?
Check LDO5, PVCC and ENABLE of U5700.
 
T

Thomas2020

Member
Not 100% success yet.
if connected, this flex stops at 5v after connecting the charger.
If the disconnected macbook boots up normally.
I do not have a password to enter the system.
I guess I'll format it.
what is it for? (camera ? 1233456.jpg)
 
2informaticos

2informaticos

Administrator
Staff member
Probably ALS/Camera connector.

Check diode mode to ground at PP5V_CAM, w/ and w/o that connector.
Close the connector and check if starts removing LP610.
 
T

Thomas2020

Member
connector disconnected
PP5V_CAM diode mode to ground 0.260

connector connected
PP5V_CAM diode mode to ground full short circuit

removing LP610, connector connected starts normally

conclusion ---damaged camera?

to get to it I have to disassemble the screen?
 
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