rumpumpel1
Senior Member
Last Activity: Today, 06:07 AM
Joined: 07-16-2019
Location: munich
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The password is stored in the EC. See here for a description how to delete it: https://www.badcaps.net/forum/troubl...ssword-removalLast edited by rumpumpel1; 11-03-2025, 01:16 PM. -
could you please reupload the screenshot?Leave a comment:
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the EC must be supplied by the mainboard.Leave a comment:
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interesting, the Wikipedia article about VIA explains it quite well.
These are pictures of both sides of the mainboard.
...Last edited by rumpumpel1; 10-24-2025, 12:10 AM.Leave a comment:
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Fault source of a short circuit
I have a mainboard with a short circuit (approx. 0 Ohm) on the 3.3V rail. As usual, I injected current and observed the mainboard with the thermal camera. Instead of individual components becoming warm, I observed that an area of several square centimeters became evenly warm from approx. 2A.
Has anyone ever seen anything like this? Is it possible that there is a short circuit between two layers of the mainboard? The visual inspection of the mainboard did not reveal any abnormalities.... -
The supervisor password is stored in the EC (MEC1663)....Leave a comment:
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I tried to download, but it says "Invalid File Specified"...Leave a comment:
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When soldering with hot air, please note the following: when desoldering, the chip has a good thermally conductive connection to the mainboard. Chip and mainboard have almost the same temperature. You can easily recognize the melting point by the fact that the chip can be lifted off. There is only a small risk of damaging the chip.
When soldering, on the other hand, the chip initially has no thermally conductive connection to the mainboard and the hot air primarily heats the chip and only secondarily the mainboard. When the mainboard has reached the melting temperature, the chip has a significantly...Leave a comment:
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you are confusing the BIOS and the EC-ROM.
The BIOS Update package from Lenovo contains a file called *.FL1. It contains the EC-ROM. In order to generate a flashable image for the EC-ROM you need to cut off the first 32 bytes from the FL1-file and then expand it to the desired size with 0xFF.
The BIOS Update package from Lenovo contains also a FL2-file. This contains portions of the BIOS but it is not sufficient to generate a flashable image for the BIOS....Leave a comment:
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I meant "I flashed the file ..."Leave a comment:
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as described above: the resistance of 5VALW to GND is 400 Ohm.Leave a comment:
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RPT3 has 3,2V on one side and 3,0 V on the other side.
UT2 pin 33 = 3,2V
UT2 pin 32 = 0 V
UT2 pin 11 = 0 V...Leave a comment:
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The output of the load switch is 0V.
Resistance to GND is 550 Ohm (my reference board also shows 550 Ohm).
UT2 gets 20V at Pin 31 (VBUS_IN).
I checked the soldering from all four sides using a microscope. It looked ok.Last edited by rumpumpel1; 08-10-2025, 06:26 AM.Leave a comment:
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The EN# signal has 3,2V to GND.Leave a comment:
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ThinkPad E14 Gen 4 AMD NM-E501 dead
I have an E14 Gen 4 AMD that shows no signs of life.
When connected to the charger the board initially drew 30 mA at 10 V.
The thermocamera showed a hot spot at one edge of the PD controller. I therefore replaced the PD controller, after which the board drew 5 mA at 20 V.
Further investigation revealed that the power switch UT5 (NX20P5090UK) was not activated. The EN# signal is missing. This is supposed to be generated by the PD controller.
From then on I started using the battery instead of the charger.
With the battery the main power rail V9B+ is present... -
thank you for your contribution.
In the meantime I was able to fix the laptop.
Symptoms were: completely dead, the board draw 70 mA at 5 V on both ports. No LED, no fan.
I downloaded from Lenovo the latest BIOS update and extracted from the archive the file $0AR2600.FL2 and pasted the file into my L13-Yoga_223002-1_EC-ROM.bin.
After having flashed the EC-ROM (W25Q128JW) with this image the laptop was working again....Leave a comment:
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@peste: most headlines do not distinguish between Intel and AMD versions, although the BIOS SW and related problems are completely different.Leave a comment:
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Hello,
I have a dead L13 Yoga Gen 4 AMD and my last hope is a defective Software.
From the EC I extracted the following data: MTM = 21FSS0W900, System-SN = PW0C14XC and the board-SN is W3CG45G049E.
Attached is the (eventually defective) SPI-ROM (32MB) and the EC-ROM (16MB)....Last edited by rumpumpel1; 08-03-2025, 12:52 PM.Leave a comment:
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make sure, you install the SW in the right order as defined on the NLBA download page.Leave a comment:
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