Hi. Have a HP250 G3 laptop (schematic attached) that will not charge the battery.
1) The laptop works fine with the AC adapter.
2) The laptop works fine with a pre-charged battery (HP original with 880 cycles). The battery was depleted when brought in for service and we purchased a new clone with 2 charge cycles on it. The clone battery was received DOA and also will not charge with the laptop.
Then we purchased the NLBA1 tool which worked well to ping the clone and HP battery with success. While we could readout the parameters with the I2C / SMBUS interface, the clone battery was unable to be charged with the NLBA1 tool.
The same NLBA1 tool was able to charge the HP original battery with 100% success in about an hour.
We applied this pre-charged battery onto the logic board and the laptop booted fine into Windows and reports the battery gauge @ 98%. The laptop continues to work while the battery drains and is presently @ 45% and going down.
If we attach the ac adapter, the battery level will become static but continues to state "charging" but it does not charge up. Will remain at the current % level.
3) Have replaced the charger IC @ PU101 and the 3 interface mosfets with no improvements.
So we know that the AC adapter is able to power the logic board and does not make use of the battery since the battery level does not drain in this configuration.
If using the battery only, the laptop works but drains the battery.
In the absence of the battery, the BATT rail is ~3V.
With the battery & ac adapter, the BATT rail is ~15V.
Is it possible that PU101 (charger IC) is unable to charge this somewhat stale battery due to perhaps a higher current draw during the charging cycle ? Again, NLBA1 tool can charge this battery if out-of-circuit.
Any ideas / suggestions on what could be at fault ? Thanks.
1) The laptop works fine with the AC adapter.
2) The laptop works fine with a pre-charged battery (HP original with 880 cycles). The battery was depleted when brought in for service and we purchased a new clone with 2 charge cycles on it. The clone battery was received DOA and also will not charge with the laptop.
Then we purchased the NLBA1 tool which worked well to ping the clone and HP battery with success. While we could readout the parameters with the I2C / SMBUS interface, the clone battery was unable to be charged with the NLBA1 tool.
The same NLBA1 tool was able to charge the HP original battery with 100% success in about an hour.
We applied this pre-charged battery onto the logic board and the laptop booted fine into Windows and reports the battery gauge @ 98%. The laptop continues to work while the battery drains and is presently @ 45% and going down.
If we attach the ac adapter, the battery level will become static but continues to state "charging" but it does not charge up. Will remain at the current % level.
3) Have replaced the charger IC @ PU101 and the 3 interface mosfets with no improvements.
So we know that the AC adapter is able to power the logic board and does not make use of the battery since the battery level does not drain in this configuration.
If using the battery only, the laptop works but drains the battery.
In the absence of the battery, the BATT rail is ~3V.
With the battery & ac adapter, the BATT rail is ~15V.
Is it possible that PU101 (charger IC) is unable to charge this somewhat stale battery due to perhaps a higher current draw during the charging cycle ? Again, NLBA1 tool can charge this battery if out-of-circuit.
Any ideas / suggestions on what could be at fault ? Thanks.
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