HP Probook 430 G2 (LA-B171P) Battery not detected

[RomanSko1]

Hello, gentlmen!!!
My HP Probook 430 g2 does not detect battery. I tested the battery on another laptop and it is OK.
I believe smth is wrong with my PC ((.
Searching this forum I found some nice suggestions.
So, I tested Battery Connector pins (charger in/battery out) and here are my results:

pin_1 0v (-)
pin_2 3.30v
pin_3 0v
pin_4 3.38v (SCL)
pin_5 2.55v (SDA)!!!
pin_6 2.25 (+)

As far as I understand SDA pin must be ~3.3v???
Are there any other tests I can do before disassembling motherboard?
I appreciate any help and hints. Thank u.

[mon2]

Based on the shared information and the feedback from the other techs, the MEC (microcontroller based) could be defective or the internal firmware is corrupted. The battery BMS communicates over SMBUS / I2C which you have confirmed is not defective. Usually there should be only a single SMBUS master and that is the charger IC. However, since the same SCL / SDA lines also travel to the MEC, if the MEC GPIO pins are not properly configured (they are not defective based on the posted diode mode readings), they SCL / SDA lines maybe strapped or at least preventing the SMBUS traffic from proceeding -> resulting in the failure to detect the battery pack.

If your arduino can be made to act like a SMBUS analyzer, you can confirm this theory. Monitor the traffic while booting the logic board. Personally, would hunt down a nearby trace near the MEC pins and with a sharp X-ACTO knife, cut the PCB trace. Later, you can scrape off the black / blue / whatever color solder mask and solder blob it back together again. This idea is to only remove the MEC from camping onto the suspected SMBUS interface. At this time, we really do not know if it is ONLY the SCL or perhaps could be both, the SCL and SDA lines that are being messed with by the MEC.

Suggest to start with cutting a small PCB trace on the SCL line only -> test. Just the same, what role is the MEC playing here with the battery?

[mon2]

Measure the same pins for their voltages to ground on the known good laptop.

Remove all power and no battery. Meter in diode mode. Red meter probe, yes red to ground. Black meter probe to point to test. Test each of the same battery connector pins. Post each measurement.

Is this battery discharged? Do not see a proper output battery voltage in the list.

[RomanSko1]

Measure the same pins for their voltages to ground on the known good laptop.

Remove all power and no battery. Meter in diode mode. Red meter probe, yes red to ground. Black meter probe to point to test. Test each of the same battery connector pins. Post each measurement.

Is this battery discharged? Do not see a proper output battery voltage in the list.

1) I have no possibility to make measurements from another laptop now (((. Maybe at the end of the next week.

2) DIODE MODE TEST RESULTS (6-pin battery connector, laptop side):

pin_1 - red to ground
pin_2 - 800
pin_3 - 1
pin_4 - 615
pin_5- 615
pin_6 - 570

3) The battery is absolutely new.
My laptop worked several hours using this new battery (even being not detected) until it wasn't totally discharged.
Another laptop detects and charges it well.
So, the battery discharged and I can't charge it anymore as it isn't detected by win7 or bios (M74 01.54).
I make some smbus readings from the battery and see that it is 13.3V now.
The bat. communicates fine via I2C.

Thank u, for your help.

[mon2]

Smbus pins are ok. The lower voltage could be from the line toggling. Is the battery compatible with this logic board?

[RomanSko1]

Smbus pins are ok. The lower voltage could be from the line toggling. Is the battery compatible with this logic board?

I've just tested 4 more new batteries from another seller. None of them was detected (((.
Can it be BIOS issue? I updated it several years ago.
The battery wasn't plugged in while I was updating BIOS.
I've just reset Bios to factory but nothing changed.
Is it worth uploading previous firmware? I am at 1.54 M74 now.

[rogfanther]

Are you using the correct, official HP charger ?

[RomanSko1]

Are you using the correct, official HP charger ?

Yes! It is original. Bought it brand new together with the laptop. Works perfect for 10 years already. Do I have to do some tests with it?

[mon2]

Run the hardware diagnostics referenced here:

https://support.hp.com/us-en/documen...541-4194587-16

Be sure you have all of the required low level device drivers installed.

[RomanSko1]

Run the hardware diagnostics referenced here:

https://support.hp.com/us-en/documen...541-4194587-16

Be sure you have all of the required low level device drivers installed.

mon2, thank u so much for your time.
The link you gave me was the first algorithm I realized. But no luck.
I have latest BIOS updates and made hard resets several times... Nothing (((.

[mon2]

Contact # 6 on the battery connector is BAT_DET#. The '#' suffix denotes an ACTIVE LOW signal. If this line is a logic LOW = '0', then the battery is present; otherwise with a logic '1', the battery is ABSENT.

You have a logic '1'. Take a piece of wire and ground this contact #6 AND have a battery installed. Test again.

[RomanSko1]

Contact # 6 on the battery connector is BAT_DET#. The '#' suffix denotes an ACTIVE LOW signal. If this line is a logic LOW = '0', then the battery is present; otherwise with a logic '1', the battery is ABSENT.

You have a logic '1'. Take a piece of wire and ground this contact #6 AND have a battery installed. Test again.

I got you. Here is the result:

pin_1 0v (-)
pin_2 0v <===== 3.3v before
pin_3 0v
pin_4 3.39v (SCL)
pin_5 2.55v (SDA)
pin_6 2.21 (+)

SDA voltage didn't change (.

[mon2]

Ground pin # 6.

[RomanSko1]

Pin 6 is BAT+
Your "pin6" is same as "pin2" in my interpretation. I have "BI" symbol on that pin from battery side. I believe it means "Battery In".
So, I did it correctly and SDA value stays the same (((.

I use this schematics and it suites my pinout 100%.

[mon2]

Sorry - my bad. Just came back from a Costco run. My reference is a G3 schematic - can you link yours in the schematic forum?

What is the voltage to ground of the pull-up voltage = 3D3V_AUX_S5 ?

[RomanSko1]

Here is the schematics I rely on.


Page 39.

https://www.badcaps.net/forum/troubl...849#post770849

[mon2]

Confirm the RTC battery voltage.

[RomanSko1]

CMOS Battery was 2.67V. Changed it to a new one. Now it's 3.3V.
I had to disassemble laptop to confirm rtc bat, so, I made some additional tests.
I checked charger BQ pins 8 and 9. They are 2.55 (SDA) and 3.38 (SCL).
After that I checked pins 111 and 112 of MEC1322-NU. They have same measurements for SDA and SCL - 2.55 and 3.38.

Is it possible that my MEC is malfunction?
How can detect BQ version (it has no writings on it (((( )?

[Ponto da Manutenção]

1) I have no possibility to make measurements from another laptop now (((. Maybe at the end of the next week.

2) DIODE MODE TEST RESULTS (6-pin battery connector, laptop side):

pin_1 - red to ground
pin_2 - 800
pin_3 - 1
pin_4 - 615
pin_5- 615
pin_6 - 570

3) The battery is absolutely new.
My laptop worked several hours using this new battery (even being not detected) until it wasn't totally discharged.
Another laptop detects and charges it well.
So, the battery discharged and I can't charge it anymore as it isn't detected by win7 or bios (M74 01.54).
I make some smbus readings from the battery and see that it is 13.3V now.
The bat. communicates fine via I2C.

Thank u, for your help.

===============================================================================================

pin_1 - red for earth pin_2 - 800-----------------------------Checks if there is communication with pin 2 of (U2701)
pin_3 - 1--------------------------------This is wrong. check pin 3 of D392?
pin_4 - 615
pin_5- 615
pin_6 - 570 =================================================== ====================================
pin_1 0v (-)-------------ok pin_2 3.30v------------------------is supposed to be at 00 pin_3 0v---------------------ok
pin_4 3.38v (SCL)-------------------------------------
pin_5 2.55v (SDA)!!---------------------checks RN3901
pin_6 2.25 (+)--------------------------------------------- ---------Wrong... your battery is 13.3V... check or replace (PU4004....BQ24736)

[mon2]

With no power -> also confirm the resistance of R3902.

[mcplslg123]

You need to check each and every part connected on SDA line. Howver, if you sio is MEC14XX ,very likely its MEC fault as this is quite common(have faced atlest 10 times in last 6 months alone). You can just try lifting the SDA pin on EC(or cutting the track will also do) and see if SDA jumps back to 3.3V on charging IC. However, it needs good skill and practice to do so ,else there is a chance of damaging the EC.