(347) 552-2258 [email protected]

820-3437-B battery problem

I

interaptiva

New member
Hi everyone, I have a 820-3437B with a strange problem: It has a liquid damage, does not start without a connected charger, the LED turns orange and the battery always remains at 0%.
I checked if there was oxide on the board, I cleaned everything and I did a 150 ? reflow on the SMC chip. for a few minutes it came back to work properly and the battery charged with normal percentage increase but then the problem recurred.
I removed the SMC chip and reballed but I did not solve it.
using the original battery this is not recognized, using a compatible battery is recognized but remains at 0% and lightning appears on the battery symbol.

Q7155 I have B GATE and PPVBAT_G3H_CHGR_R at 8.6Volts when the charger is connected

on PPVBAT_G3H_CONN I have 7.17Volts and it does not increase

Can you help me? thank you
 
2informaticos

2informaticos

Administrator
Staff member
Post diode mode to ground on both SCL/SDA lines of battery bus; also voltage.

"It has a liquid damage"
Which area?

You may need to remove and clean the battery connector; even to change it
 
J

JohnB8812

New member
Ok so you have a CHARGING issue NOT a recognizing the battery issue, so reballing the SMC was pointless. Check resistance between pins 17/18 and 27/28 of the ISL6259 and report what you get. What voltage do you get on PPBUS_G3H with just the charger no battery?
 
2informaticos

2informaticos

Administrator
Staff member
I forgot to mention, post exact voltage for CHGR_A/BMON; both charger and battery connected.
Also post exact ohm value (measured onboard) for R7180/81.
 
I

interaptiva

New member
the liquid damage was very light, there was a little oxide on the trackpad / keyboard, but nothing was visible on the board.

resistance on pin 17-18 -------- 3.6 ohm
resistance on pin 27-28 --------20.0 ohm

PPBUS_G3H is 8.60 Volts without battery, only charger

R7180 ------- 100k correct
R7181 ------- 62k correct
 
I

interaptiva

New member
I tried several batteries, only with one in particular is detected. the others are not recognized. what is detected remains at 0% on the system info the battery is present but is not charging. the lightning bolt appears on the battery symbol at the top right
 
J

JohnB8812

New member
Ok so the lightning bolt doesn't change over and says "Battery is not charging"? If so, I suspect maybe a bad ISL6259
 
You must log in or register to reply here.
Top