>>>> i was beginging to think maybe a too large charger could make the EC go to protection mode?
It sounds strange, but I made a similar experience with a Lenovo X380: it did not start with an original Lenovo 230W charger, but it started with a 90W charger.
rumpumpel1
Senior Member
Last Activity: Today, 08:24 PM
Joined: 07-16-2019
Location: munich
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So far I have not been able to solve the problem. I have tried using hot air and cold spray to locate the defective chip, but to no avail.Leave a comment:
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testing with a charged battery is important, because you know if the fault is either before (and including) the battery charger or after the battery charger.Leave a comment:
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You don't need a battery to turn it on. A bare board with just a fan should turn on the moment you plug in a charger.
Is the behavior the same for both USB-C connectors?
What happens if you try to power up the board with just a (charged) battery?Leave a comment:
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yes, you need to put back the resistor....Leave a comment:
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>>>>Is there something else that might be dead, thus preventing the laptop to turn on?
yes, several hundred other parts, which may be defective.
What is the current consumption (without battery)? Is it constant? Is there any initial peek?Leave a comment:
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mapping of MemTest86 errors to a single chip
I would like to receive confirmation that the following considerations are correct:
I have a Lenovo ThinkPad T490s (NM-C891) with 16GB RAM (8 chips) soldered on the mainboard.
MemTest86 reports the following errors:
Lowest Error Address: 0x1F97B0930 (8087MB)
Highest Error Address: 0x1FB7B6DB0 (8119MB)
Dividing the 16GB into address ranges per chip I get the following table:
#1 0x000000000 - 0x07FFFFFFF
#2 0x080000000 - 0x0FFFFFFFF
#3 0x100000000 - 0x17FFFFFFF
#4 0x180000000 - 0x1FFFFFFFF
#5 0x200000000 - 0x27FFFFFFF
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have you ever found a solution?Leave a comment:
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there is an active user group on facebook.Leave a comment:
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schematics sometimes contain the exact designation of such parts. Ask google.Leave a comment:
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It's ok to use the mainboard without heat sink for a few seconds.
Before you dispose your mainboard I would do the same test with a working mainboard of the same type and with the same CPU.Leave a comment:
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yes, the version 'unlock with 00 ...' works.
thank you very much.Leave a comment:
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Based on some other threads on this topic, I tried to overwrite 128 bytes with FF in the EC dump starting at 0x0002EF00.
It looks like I found the right place, but just deleting everything seems not to be enough, I get the error: Post process stopped due to bad SVP data.
Any help would be greatly appreciated.Leave a comment:
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I have a X395 with a BIOS password. Could someone please help me to remove the password?
MTM: 20NMS1U800
unit SN: PC1KRHEL
board SN: L1HF07L02H5
[ATTACH]n3553848[/ATTACH]
In case of an E14 Gen3 the password is stored in the EC, so I attach also the EC dump of the X395:
[ATTACH]n3553849[/ATTACH]I have a X395 with a BIOS password. Could someone please help me to remove the password?
MTM: 20NMS1U800
unit SN: PC1KRHEL
board SN: L1HF07L02H5
[ATTACH]n3553848[/ATTACH]
In case of an E14 Gen3...Leave a comment:
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No error from Lenovo diagnostics. I put the board in another T490 case, I flashed the BIOS from another known good T490, I initialized the EC and reconfigured it with the hardware maintenance disk.
The error message remains.Leave a comment:
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yes, I was aware of that. There are also some other reasons for this error message, but none of these apply in my case.Last edited by rumpumpel1; 01-20-2025, 07:42 AM.Leave a comment:
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After flashing this BIOS and disconnecting and reconnecting the BIOS battery (cold start), I expected to see the message "press F1 to enter date and time" after a while. Instead I get the message "To interrupt normal boot, press Enter". The fan is running at full speed and the laptop is unresponsive to any keystrokes.Leave a comment:
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T490 error message 2203 Skip acknowledgement of an error message
I have a T490 that displays the error message “2203: System configuration is invalid” immediately after the Lenovo logo every time it boots up.
This message must be acknowledged with 'Esc'. On the one hand, I cannot eliminate the problem, on the other hand, I have not observed any other restrictions.
Is it possible to change the BIOS so that this message no longer has to be acknowledged?
MTM 20N3S19L00
system SN PF1X4JP8
board SN L1HF171000X... -
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3548681}[/ATTACH]
remove the excess solder so as not to bend the pogo pins....Leave a comment:
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I have a ThinkPad T470p that cannot initialize the Ethernet connection. The device manager shows the device with an exclamation mark and the error message is "Code 10".
I know it is BIOS related because flashing the BIOS from another T470p fixes the problem (but introduces a code 10 error for the fingerprint reader). I would be very grateful if someone could fix the BIOS.
Machine Type Model: 20J6001AGE
System unit serial number: PF0ZW5AL
System board serial number: L1HF81J007G
[ATTACH]n3546282[/ATTACH]...Leave a comment:
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