ACER Spin SP113-31-P6NZ not working on Battery

[mon2]

Re: ACER Spin SP113-31-P6NZ not working on Battery

There has to be a local resistor on the pin # 5 trace or perhaps is missing due to a drop of the unit ?

This local pull-up resistor will then go to an always ON rail that must be powered from your battery supply. Assuming the battery is charged, the open drain ACOK# line should float to the ALWAYS ON rail value.

If the adapter is mated, this ACOK# should be LOW (0v).

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

I wish I had the Schematics, but this track has NO resistors at all. There is tiny track on Pin 5 & then come the on-board hole which directly leads to Pin 110 of the IO Chip. If I can get a clear photos, will surely upload it.

[mon2]

Re: ACER Spin SP113-31-P6NZ not working on Battery

With the power removed - what is the resistance to ground of the pin # 5 of this device ?

I would think that this pin is an open-drain output, like all past charger ICs from TI. So it will need a pull-up resistor.

Maybe they have an internal pull-up ?

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

143Kohm (pin 5 for BQ24737 to GND of the motherboard, here you go... I think we have got the answer.... I will check if I can purchase the schematics for this model.

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

Just got the schematics for this ACER Spin SP113-31-P6NZ model Wistron IRONHIDE_APL - 16835-1M - 16A08-1M Schematic... Hope it helps all.

[mon2]

Re: ACER Spin SP113-31-P6NZ not working on Battery

Schematic shows a 100k pull-up @ PR4427 on pin # 5 - do you have the same on your board ?

What is the voltage of 3D3V_AUX_S5 ?

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

3D3V_AUX_S5 is 3.27V & I do not see the 100K PR4427 pull resistor... REG on this pin 16 should be 6V, where as it's 0 volts, but before the DIODE PD4401 on the "K" point the volts keeps on dropping & no PWR_CHG_REGN, this should be around 3.3v, only 1 volt on Pin 11 of BQ737

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

I soldered a defective BQ24737 taken out from a donor board. I soldered a good one & get all voltages on the point where I was have problem. But the problem still is there, the motherboard detects the battery but does not charge at all. When the motherboard is on, I plug in the battery, after a few seconds the LED glows orange & then turns off but the motherboard is still working, & as soon as I remove the AC power, it just turns off. Pin 11 of BQ737 is still giving out 0.72 volts where as I think this should always be 3.3v???

[mon2]

Re: ACER Spin SP113-31-P6NZ not working on Battery

Check the SRN and SRP voltages at the charger IC pins.

Post their values.

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

JUst entered the WS.... Pin 12 SRN 2.7V and Pin 13 SRP 2.7V when ONLY on AC Power, no battery attached. As soon as I plug in the battery terminal with AC power attached, the voltages on these point goes to 12.6V & then drops to 0.78V. & one more thing as soon as I attach the battery terminal the motherboard turns ON (BLUE LED) by itself.

[mon2]

Re: ACER Spin SP113-31-P6NZ not working on Battery

Remove all power. Check the mosfet resistance for each device.

Meter in 2k scale.

source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate(4) & drain (5-6-7-8)

Post the readings for each mosfet.

Time for a run to Freshco...BBL.

[SMDFlea]

Re: ACER Spin SP113-31-P6NZ not working on Battery

Have you checked the battery switch SW1

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

The Battery RESET switch is 100% fine.
PU4409 (GND to these point)
source (1-2-3) & drain (5-6-7-8) = 1M
source (1-2-3) & gate (4) = 125Kohms
gate(4) & drain (5-6-7-8) = 1.2M

PU4403
source (1-2-3) & drain (5-6-7-8) = 1M
source (1-2-3) & gate (4) = 130Kohms
gate(4) & drain (5-6-7-8) = 1.2M

Drain MOSFET even seems to be ok.. I removed it & checked

[mon2]

Re: ACER Spin SP113-31-P6NZ not working on Battery

Can you confirm that you are testing the mosfets as follows ?

source (1-2-3) & drain (5-6-7-8)

Red meter probe on source & black meter probe on drain ?

and so on...

for each mosfet. These tests are not to ground. Repeat for each mosfet linked to the charger IC.

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

The MOSFET were test NOT with GND, but with meter leads & none were shorted, even I removed them & tested them, they are ok. But the DRAIN Mosfet PNP PU4408 ( Souce & Gate both should be high). As per the circuit the Gate is directly connected to 19V_AD+ which is right but why am I getting 2.7V on Drain, should this NOT be Zero??

[mferna14]

Re: ACER Spin SP113-31-P6NZ not working on Battery

One more thing I noticed, I tested the voltages on the battery terminal, when the battery is installed, I put in the AC Power & surely I get the required charging voltage nearly around 16V on the battery + terminal & even checked the Voltage & frequency on both sides of the boost caps, they last for almost 10 sec & then start turns down.