820-2915 1.7 v ppbus_g3h

[Chuck60]

Hi I’ve got this board 1.7 volts
Isl 6259
Chgr_dcin= 16.36v
Chgr_acin= 3.98v
Pins 28, 29 =20.4Ohm
Pins 17, 18= 3ohms
r7020 = .2ohms

 

[2informaticos]

Do you get 3V42_G3H and green light on Magsafe?
Did you check diode mode to ground at PPBUS_G3H?
Any history available, liquid sign?

Post other U7000 voltages; pins 1, 9, 15, 19, 20, 27.

 

[Chuck60]

Yes diode mode to ground on f9700 .459v
Yes 3v42_g3h =3.42v
Din Green light on MagSafe
No signs of water damage
I will check voyages on pins you suggested and get back to you

 

[Chuck60]

Hi at u7000
Pin 1=0v
Pin12= 3.43v pp3v42_g3h
Pin13 = 3.42v
Pin 14 =3.32v smc_bc _acok
Pin 15=0-1.49v fluctuates
Pin 19=5v
Pin 20=5v
Pin 27=16.31v

 

[Chuck60]

Ok I saw something with my oscilloscope so I plugged a battery and charger, the board chimed. Fans ran normal not on high so I’m guessing the smc is fine. Would you say now that the culprit is isl6259
These give me issues out of 10- isl6259 Only 2 where good. eBay is getting progressively worse

 

[2informaticos]

The board works now, after changing ISL6259?
Pin 1/U7000 MUST stay at 0V.

 

[Chuck60]

No I haven’t changed it yet. It won’t charge or power on without battery changing isl would be my next step

 

[Chuck60]

Ok yes now I changed it and it’s working
Thanks