820-3115-b ppbus g3hot is varrying

[NIKHIL@1997]

hi..
ihave a macbook pro a1278..part no is 820-3115-b
when i recieve the board..there is no greenlight...found isl6259 is faulty..i change it...green light is ok..but ppbusg3hot is not correct...check sensing resistors..
also change resisters...now board is turn on....but ppbus volt is varrying 12.5 to 9 v...but the board is working...any solution

 

[NIKHIL@1997]

also change R7021,R7022 Resistors..because there is value is not correct

 

[2informaticos]

First of all, welcome to the forum!

PPBUS_G3H steady without battery connected?

 

[NIKHIL@1997]

First of all, welcome to the forum!

PPBUS_G3H steady without battery connected?

no sir..... with or without battery also same problm

 

[NIKHIL@1997]

no sir..... with or without battery also same problm

Any solution...

 

[2informaticos]

Post exact resistance between pins 17/18 and 27/28 of U7100; remove power first!

3V42_G3H varies too?

BTW, write directly on the Reply box, don't click Reply button.
I don't see any reason to quote an entire post, visible few centimeters above.

 

[NIKHIL@1997]

pin 17&18 shows 3.4 ohms
27&28 shows 20.4 ohms

 

[2informaticos]

What about 3V42_G3H?
Stable voltage at F6905?
Are you using original Magsafe 60/85W charger?

 

[NIKHIL@1997]

3v42_G3H SHOWING 3.46....ITS STABLE...NOT VARRYING

 

[NIKHIL@1997]

F6905 showing 17v...its stable..i use orginal adapter..also i check another
same board with this adapter...so adapter is ok

 

[2informaticos]

So the board works good, no issues?
Did you check PPBUS_G3H at F7040?
Battery is recognized and charging?