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schematics can be found here: [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/85066-lenovo-thinkpad-nm-b461-l480-l580-el480-tvw[/url]https://schematics can be found here...l480-tvw[/url]
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Lenovo L480 NM-B461: strange power delivery response
I have a L480 board with a working USB-C port and a non-working docking port that only runs on 5V. I have replaced the TB-Bios but to no avail. Both ports show 0,6V in diode mode. My Kingst Logic Analyzer showed the following strange response.
The charger offers correctly 4 voltages:
0.8781038000,Header,(8589951393),DataObject:4 Source V3 DFP Source_Capabilities
0.8781686000,PayLoad[0],(168923436),V:5V Imax:3A
0.8782978000,PayLoad[1],(1233196),V:9V Imax:3A
0.8784272000,PayLoad[2],(1356076),V:15V Imax:3A
0.8785566000,PayLoad[3],(1458501),V:20V Imax:3.25A...
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ThinkPad T460p keeps restarting instead of shutting down
I have a ThinkPad T460p that keeps restarting instead of shutting down. The culprit is the LAN: if it is disabled in the BIOS, the problem is solved. I have already replaced the LAN chip (WGI219LM) twice, done CleanME, flashed another BIOS. Unfortunately all without success. What else can I check?
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The basic question is: how can I tell the difference between a running CPU and a shorted CPU? I asked this question on this forum some time ago, but didn't get an answer. My method is to probe the CLK pin of the BIOS chip with an oscilloscope. If there is a lot of activity then the CPU is running, otherwise the CPU is dead.
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well, that was my plan: replacing the original chip with an empty one in the hope, that it becomes flashed during boot and then adding some missing details with the Lenovo hardware maintenance disk. This way getting rid of the password ...
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There are a few other traders on ebay and aliexpress who offer exactly the same chip. When asking about the size of the chip I didn't get an answer. The chip is used in the board NM-D361 (Thinkpad X13 2. Gen Intel). Boardview and schematics can be found here: [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/105372-nm-d361-lenovo-thinkpad-x13-gen-2-schematic-boardview[/url]https://There are a few other trader...king about the
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MEC1503 from aliexpress
Hi,
a few weeks ago I saw offers for a MEC1503 on aliexpress. Out of curiosity, I bought one and was a bit surprised when the chip arrived: as you can see in the picture, it was significantly smaller than the original in my ThinkPad. Does this chip really exist in 2 sizes or is it just a fake?
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"grafik.png","data-attachmentid":3253284}[/ATTACH]Hi,
a few weeks ago I saw offers for a MEC1503 on aliexpress. Out of curiosity, I bought...
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schematics can be found here: [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3244233-schematics-for-nm-b061-thinkpad-x270[/url]https://schematics can be found here...pad-x270[/url]
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ThinkPad X270 (NM-B061) no POST
I have a ThinkPad X270 (NM-B061) with the following error: the mainboard tries to start, the current goes up to 80 mA and then immediately drops back down to 20 mA. This is repeated every few seconds. Fortunately, there is a timing diagram at the end of the schematic. Starting from the top up to and including -PWRSW_EC it is all as shown in the diagram. Starting with -PCH_SLP_S4 you can see the periodic behavior, i.e. instead of the signal staying at 3.3V, it always drops back to 0. What conclusions can I draw from this behavior?
[ATTACH=JSON]{"data-align":"none&qu...
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How to distinguish a looping CPU from a shorted CPU?
I have a mainboard that constantly draws 250 mA. The cooler is getting warm. How can I tell the difference between a running and a shorted CPU?
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In addition to the main purpose of a bidirectional switch, the first MOSFET also serves as an inrush current limiter.
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