I was celebrating too early.
Found an issue 😕.
When i unplug AC adapter the fan starts working at 100% and after reboot bios error 90b appears. (((
If i plug in charger everything is fine.
So, battery usage leads to incorrect fan work.
I checked mec pins several times if they are soldered properly. Everything is perfect.
What can be the reason?...
RomanSko1
Member
Last Activity: 12-15-2024, 05:13 AM
Joined: 05-11-2024
Location: Pino
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Hi, guys!!! I finally received my new MEC from china!
Installed it and ... BINGO!!!! It works!!!
Battery detected and charged!
Thank you all for your help!!! 🙏 🙏...Leave a comment:
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As far as I understood it's not programmable.
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/61328-programmable-and-non-programmable-sio-list[/url]https://As far as I understood it's ...sio-list[/url]Leave a comment:
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I've unsoldered mec and now sda pin is 3.3v.
So, i am waiting for a new mec1322-nu.
Leave a comment:
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The laptop operates perfect when powered by battery.
But now I can't charge battery, cause it is not detected.
The voltage becomes 13v after i press on button. But now it is impossible cause I disassembled motherboard and the voltage of the battery became too low .
I become more and more convinced about MEC problem (((....Leave a comment:
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1) The battery shows 0v when it is disconnected.
But I should mention that the battery was tested on the same laptop (my friends') and it was detected and charged.
When I insert it into mine it is not detected but it powers my laptop well until not discharged.
So, i'm sure it gives necessary voltage. The problem is not on the battery side. I checked 4 more new batteries from local seller. None of them is detected.
2) When i connect battery back to motherboard the voltage drops to 2.5v.
I tested the battery using arduino. It communicates fine via smbus. Pinout...Leave a comment:
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First of all I want to thank you all guys for such a great support. Nice community!!!
This stimulates me fix the issue myself.
Here is what I have by now.
I found another manual - la-b181p. All labels fit my motherboard.
1) I tested 2 diode suppressors (d3901). They are perfect. I even unsoldered them to test if smth changes but ... no!!!
2) I also tested all resistors involved: 100 ohms; 4.7kohm. Everything is fine as well as capacitors.
I like the idea to cut pin 111 from MEC1322. But that's a risky procedure. Will this trick work if I unsolder BQ?...Leave a comment:
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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 (((( )?...Leave a comment:
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Here is the schematics I rely on.
Page 39.
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/37710-searching-for-hp-probook-4540s-schematic?p=770849#post770849[/url]https://Here is the schematics I rel...k-4540s-schemaLeave a comment:
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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%....Leave a comment:
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I got you. Here is the result:
pin_1 0v (-)
[B]pin_2 0v <===== 3.3v before[/B]
pin_3 0v
pin_4 3.39v (SCL)
pin_5 2.55v (SDA)
pin_6 2.21 (+)
SDA voltage didn't change (.I got you. Here is the result:
pin_1 0v (-)
[B]pin_2 0v <===== 3.3v before[/B]
pin_3 0v
pin_4 3.39v (SCL)
pin_5 2.55v (SDA)
pin_6 2.21 (+)
SDA voltage didn't change (.I got you. Here is the result:
pin_1 0v (-)
[B]pin_2 0v <===== 3.3v before[/B]
pin_3 0v
pin_4...Leave a comment:
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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 (((....Leave a comment:
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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?...Leave a comment:
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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....Leave a comment:
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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...Leave a comment:
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HP Probook 430 G2 (LA-B171P) Battery not detected
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)
[B]pin_5 2.55v (SDA)!!![/B]
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... -
I am new to electronics. Glad to join you.Leave a comment:
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