Macbook A2289 820-01987

[sourcensolutionsonline@gm]

I Have a donor board coming exactly the same model , I will reflash U2890 and see how it goes , otherwise I will have to suggest the client to get a new motherboard, but the data is important , will have to back up some important files via emails so that at least .
I will keep you in the loop.

 

[sourcensolutionsonline@gm]

R3205 UPC_XA_UART_TX = 3.3V but diode mode reading is 0.00

R3021 UPC_XA_RESET 0=0.00V and diode mode reading is 0.00 is that normal I do not have a Donor board here to compare.

 

[2informaticos]

R3021 is 0 ohm resistor; so normal reading there.

About UPC_XA_UART_TX, allow 10-15s after power is removed, before checking on diode mode.
There can't be short, if you get 3.3V.

 

[sourcensolutionsonline@gm]

I unplugged it since the time that I posted the voltages and I woke up this morning after pretty much 10 hours I checked its diode mode reading again and R3205 still diode mode 0.00 and still getting 3.3V Should I remove that resistor and check its diode reading while being removed or should U3200 BE remove and check Diode mode reading?

 

[2informaticos]

Was the battery disconnected too?
Check in ohm scale, instead of diode mode.

 

[sourcensolutionsonline@gm]

Yes , board is alway pulled out from top case while running the diagnoses. will check it in ohm