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[SOLVED]820-3476 only operating on battery

O

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. :)
 
O

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)
 
O

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…
 
D

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.
 
O

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.
 
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