I have a Toshiba Satellite C70-B (Motherboard AR10SU-6050A2631701-MB-A01) with, I presume, issues with its charging circuit. I had a dead battery for a long while and had to keep the AC connected to be able to use it. I decided to finally replace the battery, but the replacements are not working. The amber power LED blinks repeatedly and the laptop refuses to start. I tried multiple replacement batteries, they all show the same behaviour.
Here is what I know so far:
AC only - OK. Power LED burns white and laptop boots.
AC + dead battery - OK. Power LED burns white and laptop boots. After a while, the LED starts blinking amber, but I can keep using it. If I turn off the laptop while LED blinking, laptop won't start until AC disconnected and reconnected.
New battery - Power LED blinking amber. Doesn't start
AC + New battery - Power LED blinking amber. Doesn't start
When I boot with AC only and then connect the new battery, power LED turns from white to amber (blinking), OS shows 60% charge but 0 charging current. If I then unplug the AC, laptop shuts down.
As I tried multiple replacement batteries, and they all behave the same, I opened up the laptop and took some measurements of the charging IC BQ24735 (see attachments). Nothing really jumped out at me, other than BTST not being Vbat+6V when new battery + AC connected, but I have no idea why this is the case. I also found it odd that on the new battery, BATDRV is high and I see VCC on the SYSTEM output, meaning the laptop should be working but doesn't?
Any ideas on how to proceed? Is the charging IC faulty, a short somewhere around it or an issue with current sensing resistors? Also, I was unable to find a board view or schematic for this board, so if anyone could share, that would also be very helpful.
Thanks in advance!
Here is what I know so far:
AC only - OK. Power LED burns white and laptop boots.
AC + dead battery - OK. Power LED burns white and laptop boots. After a while, the LED starts blinking amber, but I can keep using it. If I turn off the laptop while LED blinking, laptop won't start until AC disconnected and reconnected.
New battery - Power LED blinking amber. Doesn't start
AC + New battery - Power LED blinking amber. Doesn't start
When I boot with AC only and then connect the new battery, power LED turns from white to amber (blinking), OS shows 60% charge but 0 charging current. If I then unplug the AC, laptop shuts down.
As I tried multiple replacement batteries, and they all behave the same, I opened up the laptop and took some measurements of the charging IC BQ24735 (see attachments). Nothing really jumped out at me, other than BTST not being Vbat+6V when new battery + AC connected, but I have no idea why this is the case. I also found it odd that on the new battery, BATDRV is high and I see VCC on the SYSTEM output, meaning the laptop should be working but doesn't?
Any ideas on how to proceed? Is the charging IC faulty, a short somewhere around it or an issue with current sensing resistors? Also, I was unable to find a board view or schematic for this board, so if anyone could share, that would also be very helpful.
Thanks in advance!
Attached Files
, now I wait tools for repairing battery.
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