[SOLVED]820-3476 only operating on battery

outta-warranty

New member
Hello guys! I have a water-damaged 820-3476 which only can work when the battery IS attached.

History: All it could do before was a loud fan spin, nothing more. I cleaned the board, replaced some SMD's and ISL as well around that area. I found corrosion under U8030 and jumped pin2 to C8010. The board turning on and chime as well. Has no backlight and only working on battery. The main thing I want to repair on it is the power issue first.

Here is the problem with:

It does NOT charging the battery, can read the cycle count, show proper percentage. I have green then orange led on the charger. If the battery is disconnected from the board, all it can do with original 60w/85w adapter is turning on, chime then shut off. turning on again .. ... same cycle. I tried with other battery, charging port, have the same symptom.

I'm not expert in board repair but I was able to solve some backlight, isl and other kind of problems before on other board but I'm stuck with this one.

I would greatly appreciate any suggestion, help.

Sorry for the grammatical errors. :)
 

outta-warranty

New member
Thank you for your answer. Green light that turns orange is present. I'm going the measure the resistances tomorrow and answer your question about that. (different timezones)
 

outta-warranty

New member
Hey there!

Without battery (original 85W adapter):

When the board is powering on PPBUS_G3H is 12.6V
When shuts off itself then 3.6V after a sec it’s starting again to turning on with 12.6V then shuts off and 3.6v.

With battery:

Dropping from 12.8V to around 5V, going back to 12.8V dropping again to 5V…
 

dukefawks

Administrator
Must be an issue around ISL6259. Check pins 17/18 again as they should be 3 Ohm and 27/28 21Ohm, you reported it the other way around.
 

outta-warranty

New member
The measurements was fine, and the resistors was the problem!!! I love you from the bottom of my hearth. Thank you very much for helping me out.
 
Top