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820-2850 TB3T Sensor is faulty in ASD

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arash

Member
Hi guys, the machine doesn't recognize the battery and partially working with the charger connected - shut down sometimes. I cannot located the TB3T sensor on the schematics and brd file.
Can someone please direct me to its location? Thanks
 
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dukefawks

Administrator
It's the battery sensor. Tried a known good battery? Disconnected battery indicator? After that it could be bad ISL or SMC, probably SMC.
 
A

arash

Member
Tried with a good known battery, with/with out battery indicator connected shows the same error.
Also, PPBUS_G3H seems to me at fault --- PPBUS_G3H=9.9V with battery and charger connected. PPBUS_G3H=8.8V with only charger connected
 
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dukefawks

Administrator
8.8V with just charger would at least indicate an issue with the 6259. Replace it and check the sense resistor circuits.
 
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arash

Member
U7000 was replaced. Current sense resistors circuits seem to be OK. The voltage remain the same as before - 8.8V and 9.9V. The problem persists
 
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arash

Member
I used 6259. Resistance between pins 17/18 and 27/28 of U7000 is the same - 20.7 ohm. Voltage on pin 2 is 16.5V
 
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arash

Member
My bad, the board number is 820-2530. Wrote 820-2850 by mistake.
I used 6258.
The resistance between pins 17/18 and 27/28 of U7000 is the same - 20.7 ohm. Voltage on pin 2 is 16.5V
 
A

arash

Member
I've rechecked the surface for bad soldering and soldered the chip again, same results as before. Any other directions I should look into?
 
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