820-2936-b

[Anterweb]

Came in for running slowly.

Takes forever to boot then when in os is so slow its unusable.
Tried all the usual swaps and disconnects

Trackpad
Keyboard
WiFi, webcam
CD drive
Battery
BIL

Still the same, I get this sensor error on diagnostic

 

[Anterweb]

error

 

[2informaticos]

What is the exact PPBUS_G3H voltage (no battery connected)?

 

[Anterweb]

PPBUS_G3H =12.55v
smc_pbus_vsense = 00.4mV

 

[Anterweb]

Checked
R7021 /22
R7051 /52
& traces to u7000 all good.

U7000 looked like it had a little corrosion so I replaced it with known good one from donor board,

testing the board now. with battery connected it see's the battery and charges the battery but is still so slow to boot and run its unusable. mouse pointer lags terribly and takes forever to do anything.

( Tested using 5 different known good original apple batteries., )

With the battery removed and running just from magsafe , It boots super fast and runs perfectly.

Any ideas?

 

[2informaticos]

VP0R is PPBUS_G3H level related.
But the voltage looks correct.
Should be good to run ASD test, may get more details.

Check SMC_DCIN/PBUS_VSENSE and SMC_DCIN/BMON_ISENSE levels; with battery and chager connected.
HWMonitor can also show you details about I/V sensors.

 

[Anterweb]

ASD test same result.

SMC_DCIN/PBUS_VSENSE reads = 0

SMC_DCIN/BMON_ISENSE reads 2.73 with just charger connected but when I connect the battery it drops to 0.042

 

[2informaticos]

I suspect corroded traces...