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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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Thunderbolt BIOS for ThinkPad E14 Gen 2 - NM-D011
Hi,
Can someone please post the Thunderbolt BIOS for an E14 Gen 2? The mainboard is NM-D011 and the BIOS has the size of 1025 KB.
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Re: Unlock SVP Lenovo Thinkpad T14 Gen2
great! Could you please be more specific?
thanks...
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Re: NM-B891 (T490s) no picture
Thank you for clarification.
But then: how can I check if RAM is working except for looking on DRAMRST?
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Re: NM-B891 (T490s) no picture
In the schematics I found a lot of SMB/I2C connections using SDA /SCL, but there is none between PCH and RAM. The Block diagram on page 2 shows Channel A+B as the only connection between RAM and CPU/PCH.
By looking into the schematics of some older ThinkPads it looks like, this SDA/SCL between RAM and PCH ist present for DDR3 but not anymore for DDR4.Last edited by rumpumpel1; 10-10-2023, 03:41 AM.
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Re: NM-B891 (T490s) no picture
Ram is onboard. There is not enough current variation.
Recently I fixed some defective RAM modules. When using these RAM modules the ThinkPad showed the same behaviour: no beep code, no picture and the current quickly drops to 400 - 500 mA.
But here DRAMRST = 1,2V. How else could I check the RAM?
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NM-B891 (T490s) no picture
Hi,
Recently I received a NM-B891 board from a ThinkPad T490s with signs a abuse: around the TBT and BIOS chip many components were missing (probably from too much hot air) and the board was flooded with flux in many places. I replaced all missing parts according to the schematic and boardview, I replaced the TBT and the BIOS chip with new and flashed chips and I replaced a blown fuse of the power LED. Now the situation is as follows: when plugging in the charger the charge LED lights up and the power LED blinks 3 times. When I press the power button the power LED lights up, the...Last edited by rumpumpel1; 10-08-2023, 01:23 PM.
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