I just bought a new T490s battery. The Lenovo Diagnostic said no battery. Open check the battery socket from motherboard it shows no voltage should be 11-12V. The usb-c power adapter had 20v and the laptop came up with ac adapter plug in. What should I check next?
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1) confirm the battery is properly seated in the connector.
2) the battery may be a dud
3) confirm you have the latest device driver for the battery support:- Lenovo Power Management Driver for Windows 11 (Version 21H2 or later) 10 (Version 1607 or later) - ThinkPad
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I did update all latest drivers. 2 batteries purchased are brand new. I measured the voltage on the battery socket pin 1 for ground pin 6 for vcc show no voltage so the battery Mosfet may be dead.Comment
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Does either battery show a voltage when it is on your work table?
measure the voltage to ground of each pin on the battery connector while it is attached to the logic board.
Locate the mosfets nearby this battery connector. Meter in resistance mode. Check each mosfet by reviewing the resistance. No power/no battery in resistance mode checks.
check:
source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8)
post each measurement. A low resistance = leaky mosfet.Last edited by mon2; 02-16-2024, 08:41 PM.Comment
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Source 123&5678 0.81volt
Source 123&4 3.35volt
Source 4&56 0.16volt
Source 4&78 3.09volt
MOSFET 1 measure 0.81volt
MOSFET 2 measure 9.21volt
Time for me to replace leaked MOSFET.Comment
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No. Interested in the resistance measurements (ohms) not voltage measurements. Select a high K ohms scale and measure as noted above. Post a pic of your meter face for a confirmation of the settings.Comment
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I am testing a ThinkPad T490s with this setup: only the bare mainboard NM-B891 with a fan and the small Power-On daughterboard as well as with a USB-C monitor (no BIOS battery!).
If I connect a battery, the mainboard starts up normally. After about 50 seconds the logo appears and after another 30 seconds the final message “... System configuration is invalid. Press Esc to continue or F1 to enter setup”.
If I connect the power supply unit instead of the battery, a USB meter shows the usual fluctuating power consumption for approx. 30 seconds, then the mainboard switches off... -
My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
Lenovo Thinkpad W541 Wistron LKM-1 WS MB 12291-2 Works from the network and charges the battery only when it is turned off.
If you press the power button, the laptop turns on and works from the battery, but does not take power from the power supply.
If you boot into Windows and close the lid while working, thereby putting the laptop into sleep mode, the laptop begins to charge the battery.
even checked it this way: I bring a neodymium magnet to the Hall sensor during operation - the screen goes out and the battery starts charging.
Also, the laptop does not turn on without... -
I bought a Vostro 3400 motherboard (LA-K033P) to upgrade over my damaged Inspiron 5593 (LA-J091P) board. Everything else is ok except for the battery. This battery I am using now is already a replacement one since I disposed of the bloated original one. Back in the Inspiron 5593 motherboard, the battery charges fine and is identified just fine. However, with the upgraded motherboard, suddenly the replacement battery is labeled as "Not a dell battery". When I borrow a similar battery from my colleague (which did not have replacements yet), it is identified and charges just fine.
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This specification for the Lenovo ThinkPad T490s Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the T490s boardview and T490s schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Lenovo ThinkPad...09-06-2024, 11:39 AM
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