Battery not charging - Dell Inspiron 3593 FD155 LA-JO81P (REV 1.0) (A00)

[lawrenceptrini]

Hi Guys,
I am seeking some assistance with a Dell Inspiron 3593 FD155 LA-J081P (REV 1.0) (A00) laptop
The laptop is working fine with the adapter plugged in and also with a charged battery.
Problem is that the laptop is not charging the battery. The battery is recognized in the bios but the
ac adapter is listed as 'Not Installed'. So for instance, when a charged battery from another source
loses its charge, it stays on 0%.


Measurements taken
Charging IC (ISL95522HRZ) 32 pins
Voltage to ground with ac adapter only plugged in:
1) 0.056
2) 0.056
3) 0.003
4) 17.31
5) 19.87
6) 12.09
7) 25.04
8) 5.266
9) 0.001
10) 0.056
11) 0.018
12) 4.944
13) 1.003
14) 19.92
15) 19.93
16) 2.429
17) 19.68
18) 5.264
19) 0.001
20) 1.420
21) 3.357
22) 3.357
23) 5.254
24) 0.009
25) 3.325
26) 1.734
27) 0.001
28) 0.001
29) 0.110
30) 0.091
31) 0.054
32) 0.001

DCIN CONNECTOR 6 pins
Voltage to ground with ac adapter only
1) 0.000
2) 0.000
3) 3.294
4) 0.011
5) 19.95
6) 19.95

BATTERY CONNECTOR 10 pins
Voltage to ground with Battery only plugged in
1) 0.000
2) 0.000
3) 0.000
4) 0.000
5) 0.000
6) 0.000
7) 0.000
8) 10.71
9) 10.71
10) 10.71

BATTERY CONNECTOR 10 pins
Voltage to ground with Battery AND Ac Adapter plugged in
1) 0.000
2) 0.000
3) 0.000
4) 0.000
5) 0.000
6) 3.324
7) 3.324
8) 10.71
9) 11.17
10) 11.17

I have attached the schematic for the motherboard
Any assistance will be appreciated.
regards

Link to schematic --> https://www.badcaps.net/forum/troubl...ed#post1859382

[mon2]

ac adapter is listed as 'Not Installed'.

This means the PSID signal from the power adapter is not communicating with the EC chip using pin # 3 of the DC power connector.

Make sure that the power adapter is a Dell original so that it will contain the 1-wire ID chip to identify the power adapter.
Make sure the Dell power adapter is of the recommended power rating and is for use with this logic board.

Confirm that the center pin inside the power connector of the power adapter is not bent or missing / broken. This is the needle like pin that must mate with your logic board and spit out the power adapter rating. In its absence, the BIOS will report what you see now.

[lawrenceptrini]

Thanks for your reply.
The adapter's center pin in the tip is in good condition. Clean on the inside and straight. It's a 65w adapter
and the rating is 19.5V - 3.34A. There's also the Dell logo on the back.

[mon2]

In general, the mosfet @ PQ1 and/or the series resistor @ PR1 become defective.

Remove all power. Measure the resistance across PR1. Confirm this part is ~33R.

Flux and remove PQ1. Bypass this over voltage crowbar mosfet by shorting pins 1-3. Download a datasheet for this mosfet to review the locations for pins 1 & 3 on this SOT-23 package.

Test again. If still not working, then the EC firmware may be at fault. It is the EC that is the bus master here who pulses this PS_ID line to send out commands to the adapter's ID 1-wire IC. Then the adapter's 1-wire IC will respond back to identify itself to the host and the details are posted inside of your BIOS.

[mcplslg123]

In case of fault with PSID it will show as adapter "Unknown". However,the OP is saying adapter "Not Installed". So PSID is unlikely to be at fault here.
What is the gate voltage of the 2 dc-in fets?
Pin24 ACOK is not correct and this is the reason for adapter not installed.

[lawrenceptrini]

mon2 thanks for the feedback

I measured PR1 resistor in (ohms mode) the reading is varying getting 35 to 37 ohms each time I measure.....

[lawrenceptrini]

mcplslg123 thank you for responding

My apologies, I made a typo with the reading of ACOK. The reading is 3.077v with adapter only, voltage to ground.
I re-took all the measurements of the IC.

The Gate voltage of DCIN Mosfets are: PQB11 - 25.04V and PQB12 - 25.03V

[mon2]

This is ok. As per suggestion by mcplslg123, ACOK is logic low and it should be a logic '1' = High if the power adapter is considered to be OK.

Review PU301, confirm if you have +3VALWP at inductor PL301. What is the voltage to ground here?

If the voltage is absent, check if the enable signals are present on pins 11 and 12 on PU301.

If the enable signals are present but you still do not have the +3VALWP, then remove all power. Meter in resistance mode. Measure the resistance to ground on PL301. We are checking if there is a shorted part on this rail and causing this regulator to wimp out and shut down.

-- just saw your last post. Then ACOK is OK

What does the bios report again with this adapter?

[lawrenceptrini]

Thanks, The voltage to ground for coil PL301 3.3v on both sides. Yes ACOK is 3v.

The Bios reports that the AC Adapter is not installed.

[lawrenceptrini]

mon2 The battery is showing up as Primary - 0% - Idle..in the Bios

[mon2]

Measure the voltage to ground of the H_PROCHOT# signal. You can measure this signal @ PQ12B - measure the voltage to ground on each pin:

gate
source
drain

Also, can you confirm the SMBUS pins on the battery connector?

6) 0.000
7) 0.000

There should be a voltage on these 2 pins as long as the battery has a charge. Same voltage should be present if operating with only the power adapter. Confirm it.

[lawrenceptrini]

Hi Thanks,

PQ12B seems a 6 pin dual Mosfet on the motherboard.....shows up as two distinct Mosfet on schematic.
I measured voltage to ground as requested: pin 3= 1.009v, pin 4= 0.000v, pin 5=0.000v

Battery Connector SMBUS voltages: pin 6= 3.3, pin 7= 3.3 with adapter only. These pins gives 0v each with battery only connected.

[mon2]

Does your battery have any charge left? Measure the battery voltage to ground at pins 8-9-10 on the battery connector. The first post shows the battery has some voltage (~10 volts).

Provided that you have a charge on the battery and the power adapter is disconnected, then the battery mosfet @ PQB13 will enable to power the logic board.

Confirm the voltage to ground on each pin of the battery mosfet @ PQB13.

Source
Gate
Drain

[lawrenceptrini]

Voltage on each of pins 8, 9 and 10 of battery connector measures 10.71v without ac adapter plugged in.
Voltages on mosfet PQB13 is as follows: Source= 10.71v, Gate= 10.12v and Drain= 10.23v with battery only plugged in.

[mon2]

Not at my desk but this mosfet may be defective. Remove all power and check the resistance across the mosfet pins.

source & drain
source & gate
gate & drain

Check type of mosfet here. If n-channel type then gate should be higher voltage than source and drain to enable. The internal diode may be passing through the voltage but check the other factors.

The battery voltage should create the voltage for the smbus pull-ups.

PQ12B may be in trouble..will check when back to the desk.

[lawrenceptrini]

mon2 Ok thanks,

will perform the tasks as requested.....

[mon2]

H_PROCHOT# is ok due to the pull-up resistor is @ 1v05.

This implies that the driving mosfet is OFF so this mosfet is open and the pull-up resistor is pulling the line to ~1v05 as in your case.

[lawrenceptrini]

Resistance across on mosfet PQB13 is as follows: Source & Drain =1.2m ohm, Source & Gate= 3.1m ohm, Gate to Drain=5.9m ohm.

PQB13 is an N-Channel Mosfet

[mon2]

Check if you have +3VALW_EC voltage using only the battery.

[lawrenceptrini]

Where is best to take +3VALW_EC reading? I took the measurement on pins 8 and 9 of EC chip (MEC1416).
It reads 0.000 for pins 8 & 9 with battery only plugged in.