820-01987 No PPBUS_G3H

raainxx

Member
Hi,
i have this board, no liquid, i try in DFU but nothing.
i have input 5V 0A (usb-c tester), PPBUS=0,343V, 0,046 in diode mode
PPDCIN_G3H = 5V
How can i find the problem please?
thanks
best regards
 

2informaticos

Administrator
Staff member
"PPBUS=0,343V, 0,046 in diode mode"
Check if any big coil gives the same reading in diode mode.

"i try in DFU but nothing"
Can't do anything on the board, until get correct PPBUS_G3H voltage.
 

raainxx

Member
hi 2informaticos, thanks for your quick reply
i have only L8102 with the same value (0,044)
ok thanks for dfu informations
 

2informaticos

Administrator
Staff member
Check for short between PPBUS_G3H and L8102.
Isn't your board 01987?
If is the case, remove Q8102 and check again the value.
 

raainxx

Member
ok thanks, Q8102 is short PPBUS to PPVCCIO_S0_CPU
sorry my board is 01987
i try to find a new component on a donor board and i come back after
 
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2informaticos

Administrator
Staff member
Looks like normal value for me.
This doesn't discard a dead CPU, because of overvoltage through Q8102...
 
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raainxx

Member
i find the mac in DFU now, is it normal?
i have PPVCCIO_S0_CPU=0v, i don't know is it normal?
i take a component on 820-00045 (Q7430), i think is same, is it true?
 

2informaticos

Administrator
Staff member
DFU requires only AWAKE and SLPS2R voltages.

Did you replace Q8102?
Q7430 from 00045 board is the same MOSFET.
 

raainxx

Member
U8110
13:5,116V
14:5,119V
3: 2,75V
6:0V
9:0V
CPU_VCCIOSENSE_P=0V
i try to find this component another board and come back for more thanks for your help
 

raainxx

Member
can i find the component ISL95870HRUZ on another (820-01041 and 820-00850) because i haven't this board?
is it the good component on farnell ?
thanks
 
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2informaticos

Administrator
Staff member
Farnell is a serious online store, why not?

Open the schematics of your donor boards and search for ISL95870H...
 

raainxx

Member
hi 2informaticos, i change U8110 but still same.
13:5,116V
14:5,119V
3: 2,75V
6:0V
9:0V
i try to restore the mac in dfu, stay black.
 
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