820-3435-B kb and T/P are not working.

Dewanbd

Member
820-3435-B kb and T/P not woirking.
It was water damaged.Did ultrasonic cleaning, check with good known
all cables and i/o card but no luck.

compare with good known mb Diode mode measurement all are good, except J4800 pin2 is .441 but the
good one mb show me OL. So i checked R4850=33 OHM , looks good and R1666=25k but it should be 47k
i replaced this but still it shows me 25k,

p1 smc lid=3.3v
p10=3.3v
p14=5.1v
p19=3.3v
Now i stuck, dont knoe what the next i should check. Any help please.
 

2informaticos

Administrator
Staff member
Check first if you can access boot menu.

"R1666=25k but it should be 47k
i replaced this but still it shows me 25k,"
Onboard mesurement for rsistance depends by other resistors/components connected in the same lines.

"J4800 pin2 is .441 but the
good one mb show me OL"
Checked with red probe to ground on both cases?

Post diode mode value (red to ground) for pin 2/6 of U4810.
Check all resistors R4850-53 from TPAD SPI lines.

Where was the spill?
Check continuity from J4800 to other components.
 

Dewanbd

Member
I found missing R4844, replase it now t/p working fine with the following measurement
U4810 (diode mode ) p2=.509 and p6=.432.
Still i see j4800 p2=.441 and it should be OL compare to good one. and my battery is not detected.
I tried two battery. All other functions of the mac are working except Battery. Any suggestions please.
 

2informaticos

Administrator
Staff member
Unless battery is 100% charged, PPBUS_G3H should have lower value when battery is connected.

Run ASD, let see if any error appears...
 

Dewanbd

Member
Now i stuck, i don't have ASD for Macbook air 11 2014, A1465, any body can help me please.
 
Last edited:

2informaticos

Administrator
Staff member
No idea really, never used for this model.
Did you change ISL6259?
Check voltage on A/BMON of it; both battery and charger connected.
Also check exact resistance between pins 17/18 and 27/28.
 

Dewanbd

Member
Thanks for replying.
No, i dint change ISL.
voltage on AMON p9= .171 ( only charger connected )
voltage on BMON p15= .172 ( only charger connected )

voltage on AMON p9= .172 ( battery connected )
voltage on BMON p15= .104 ( battery connected )

resistance between pins 17/18= 2.4 ohm
resistance between pins 27/28=20 ohm
 
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