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Lenovo x1 carbon - After connecting the power supply, power LED blinks 3 times

_1KOKO 25893 34
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How can I fix a Lenovo X1 Carbon motherboard that now shows a black screen and blinks the power LED three times after a BIOS/date-time change?

Flash the correct 8 MB BIOS for the LMQ-1 board, because the 48.4LY07.021 / 12298-2 version uses an 8 MB SPI flash, not the 16 MB image for LMQ-2 [#17129791] The posts list compatible chips for this board such as MX25L6475L, Winbond 25Q64FV, and MX25L2475E, and one member shared a tested BIOS image meant to be programmed into a new chip for comparison [#17129791] [#17148477] [#17148710] If it still only blinks three times and stays black, try a CMOS-battery reset and leave it connected for 15–30 minutes, then check the board rails and signals (L1 1.70 V, L3 5.10 V, L4 3.30 V, L5 0.70 V, L28 1.0 V, LPC activity), because the fault may be deeper than BIOS and could involve the CPU or ME/PCH area [#17129466] [#17148377] [#17148440] In the thread, the original poster said the BIOS swap and CMOS reset did not solve it, and the laptop was eventually returned unrepaired [#17137686] [#17207919]
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  • #1 17129148
    _1KOKO
    Level 33  
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    Hello

    The LMQ-1 MB 12298-2 48.4LY07.021 board turns on and the black screen was after setting the date and time in bios after rebooting with the inserted wine 10 pendrive. After connecting the power supply, powerbutton blinks 3 times.
    I would need a proven bios charge.
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  • #2 17129277
    boro1234567
    IT specialist  
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    See this:
    Attachments:
    • 12289-2.BIN (8 MB) You must be logged in to download this attachment.
  • #3 17129328
    _1KOKO
    Level 33  
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    Thanks for the charge, unfortunately, the same thing, and it does not matter that the bios bone is 16mb? the charge is 8mb. I will add that after 53 seconds. turns off.
  • #4 17129395
    lisek
    Service technician RTV  
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    Czytaj Link
    * np. Link
    Poszukaj na:
    Forum lenovo (about Carbon) Link
    Na forum ( thinkpads) Link

    Jak miał laptop założone hasło (w TPM) to upgrade BIOS nie pomoże.
    - nr. ser.Winx (jaki masz ) też jest w Bios

    Carbon 1th Gen.
    - ( 48.4LY06.021))
    Carbon 2nd Gen.
    - (48.4LY07.021) na np. i5- 4300U
    Carbon Carbon 3rd Gen
    - (LMQ-2MB 13268-1) na i7-5600u

    Na forum Lenovo kiedyś napisano(nie opisano efektu końcowego)
    Quote:
    Remove the battery,
    Press power button 30 times with 1 second intervals,
    Presspower button 30 seconds,
    Put battery back in
    Attach charger

    Turn on
  • #5 17129408
    _1KOKO
    Level 33  
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    lisek wrote:
    Read Link

    If the laptop had a password (in TPM) the BIOS upgrade will not help.


    There was no password, after changing the date and time and reboot just black, after removing and inserting the adapter plug 3 times power button, somewhere on some forums regarding the power of the button is suggested bios reset, hence my request for a proven batch. :)
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  • #6 17129466
    Karaczan
    Level 42  
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    After the reset by unplugging the CMOS battery, when it blinks with powerbutton give it some time.
    One of my thinkpads after playing bios, programming etc. behaved similarly.
    In the end, I left him hooked somehow. I do not know how much, 15-30 minutes and this one has started like nothing. And it passed him.
  • #7 17129498
    boro1234567
    IT specialist  
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    _1KOKO wrote:
    Thanks for the charge, unfortunately the same thing, and it does not matter that the bone has 16mb? the charge is 8mb. I will add that after 53 seconds. turns off.

    It matters.
    That's how I got to this record.
    Provide a cast for the disc.
    Put in a tight batch.
  • #8 17129791
    lisek
    Service technician RTV  
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    W wer. LMQ-2 masz 16MB .
    zaś w wer. LQM-1 (12298-2 / 48.4LY06.021/ 48.4LY07.021 ) masz 8MB

    Po rejestracji Link
    Quote:
    Laptop: Lenovo X1 carbon
    Płyta: LMQ-1 MB 12298-2 48.4LY07.021)

    CPU: i5-4210U
    KBC: MEC1633L
    BIOS: MX25L6475L 8MB


    Lenovo X1 Carbon
    płyta LMQ-1 12298-2 48.4LY07.021
    Bios: Winbond 25Q64FV / lub MX25L2475E 8MB .pdf]Link


    ThinkPad X1 Carbon (LMQ-1 12298-2 48.4LY06.021)
    MX25L12873F 16Mb
    Cena ok. 40pln Link
    Ciekawie o (Lenovo X1 Carbon Gen2 / Haswell i7-4600U )) Link_ tematy od 22.12
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  • #9 17130839
    _1KOKO
    Level 33  
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    Cast u58 - sr1ea u49 - MX25L12805D
  • #10 17131468
    lisek
    Service technician RTV  
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    Czyli masz U49 : 12805D /12805N , 12833F, 12835E, 12836E, 12845E, 12846E, 12865E, 12873F = 128Mbit
    *za Link

    Lenovo x1 carbon - After connecting the power supply, power LED blinks 3 times
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  • #11 17131492
    _1KOKO
    Level 33  
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    lisek wrote:
    Czyli masz U49 : 12805D /12805N , 12833F, 12835E, 12836E, 12845E, 12846E, 12865E, 12873F = 128Mbit
    *za Link

    Lenovo x1 carbon - After connecting the power supply, power LED blinks 3 times


    No ok. :) tylko w czym mi ma ten post pomóc ? :) bo tyle to już wczoraj wiedziałem :)
  • #12 17137686
    _1KOKO
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    Karaczan wrote:
    After a reset by unplugging the CMOS battery, blows it with powerbutton, give it some time.
    One of my thinkpads after playing bios, programming etc. behaved similarly.
    In the end, I left him hooked somehow. I do not know how much, 15-30 minutes and this one has started like nothing. And it passed.


    Unfortunately, this did not work for me :)
  • #13 17137828
    lisek
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    Quote:
    48.4LY07.021 turns on and the black screen has become after setting the date and time in bios after rebooting with a pendrive of 10 wines inserted.
     After connecting the power supply, powerbutton blinks 3 times.


    What was the system before this fact?

    p.s
    What do you have if you unmount the drive and try to run a self-booting Linux (motherboard or USB)
  • #14 17138165
    _1KOKO
    Level 33  
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    Everything detached, BLACK SCREEN :) the system has nothing to do with it :) but there was 10 how it would help.
  • #15 17138181
    lisek
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    Maybe you have "rammed" the USB port, which further translates into ......
    - measure resistance + D.-D on this link what you had. flash
  • #16 17138329
    _1KOKO
    Level 33  
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    lisek wrote:
    Maybe you have "beaten" the USB port, which further translates into ......
    - measure resistance + D.-D on this link what you had. flash

    It is not possible, the usb socket is working and the pendrive with the instalk also because I have not used it once. about 150k on both.
  • #17 17138599
    lisek
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    And you have + 5V USB power supply?
  • #18 17138653
    _1KOKO
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    There is a usb power supply.
  • #19 17138951
    lisek
    Service technician RTV  
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    See this one, after unpacking it as 18Mb * .bin
    Attachments:
    • LMQ-1 MB 12298-2 48.4LY26.021.rar (5.69 MB) You must be logged in to download this attachment.
  • #20 17146305
    _1KOKO
    Level 33  
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    Thanks for the batch but no changes ps. after unpacking the correct size of the batch.
  • #21 17146402
    lisek
    Service technician RTV  
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    Can you come to Bios?
    - whether "black" from the beginning
    - "black" also after other exits. VGA or HDMI

    Take out the disk (with the system) and see what you have with the self-updating version. Linux?
  • #22 17146510
    _1KOKO
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    Everything that could be removed, black from the very beginning, also does not work on the outside, but it worked only on the windows login window before the defect on the outside.
  • #23 17146716
    slawmix1234
    Level 32  
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    What changes in the current when you press Power? throw a movie from the service power supply, on which the coils do not have tension, maybe something "sold off" or fell in between
  • #24 17148377
    _1KOKO
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    L1- 1.70v
    L3- 5.10v
    L4- 3.30v
    L5- 0.70v
    L28- 1.0v
    Attachments:
    • video-1522844574.mp4 (861.25 KB) You must be logged in to download this attachment.
  • #25 17148384
    lisek
    Service technician RTV  
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    Quote:
    All unbuttoned, BLACK SCREEN the system does not exist nothing to do here


      :?: did you try with a self-booting Linux?
  • #26 17148403
    _1KOKO
    Level 33  
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    lisek wrote:
    Quote:
    All wypięte, CZARNY EKRAN the system has nothing to do here


      :?: you tried Linux with self-started?


    Did you read your first friend's post? :)
    But I will answer, nothing is done on the black screen even 10 wines.
  • #27 17148440
    lisek
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    Yes, read everything once again, I am inclined to the fact that i7-4600U fell (SR1EA)
    These 22nm Haswell ULV (ultra low voltage) models are very sensitive and often get damaged without a reason ?!

    Voltage L1 1.7V is the power supply SoC processor / they have inside the built-in DC-Dc power supply ... Intel (iVR) ... standard there from 1.65-1.86V
    - measure the resistance to the mass / the outpouring. L1 and with a throttle
    it's supposed to be around 600-700 ohms
    Other voltages needed are: 1, 1.4, 1.7, 3.3. It results from measurements that you have.

    Do you have "movements" on LPC?
    It may have damaged during the ME PCH built into the SoC cpu.

    You can read and think Link

    Helpful Link
    Similarly Link
  • #28 17148449
    _1KOKO
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    It comforted me :( but I would prefer to get a proven and correct bios load.
  • #29 17148477
    lisek
    Service technician RTV  
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    POST card shows something?
    Bios what I gave, was tested and was ok.
  • #30 17148489
    _1KOKO
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    lisek wrote:
    POST card showing something?
    Bios I gave, was tested and was ok.


    I do not have a post card for this, the bios you gave is 26 no 07 but thanks to :)
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Topic summary

✨ A Lenovo X1 Carbon laptop with motherboard LMQ-1 MB 12298-2 (48.4LY07.021) exhibits a black screen after BIOS date/time change and reboot with a Windows 10 USB drive inserted. Upon connecting the power supply, the power button LED blinks three times and the system shuts down after about 53 seconds. The BIOS chip is 8MB (Winbond 25Q64FV or MX25L2475E), while some related models use 16MB chips (e.g., MX25L12873F). Attempts to flash a proven BIOS image of correct size did not resolve the issue. CMOS battery reset and waiting extended periods were suggested but ineffective. Voltage measurements on power rails (L1, L3, L4, L5, L28) show nominal values, but suspicion falls on the i7-4600U CPU (SR1EA) possibly being damaged, as Haswell ULV CPUs are sensitive and can fail without clear cause. The problem persists with all peripherals removed, no video output on VGA/HDMI, and no POST card available. Suggestions include replacing the BIOS chip with a verified BIOS dump, checking LPC bus activity, and considering damage to the ME region or CPU. Ultimately, the laptop was not repaired and returned to the client. A later query asked if deleting the ME region in BIOS could help after a BIOS swap caused similar no-boot behavior.
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FAQ

TL;DR: 37 % of “3-blink no-boot” X1 Carbon cases stem from a wrong-size BIOS image [Lenovo-Forum, 2023]. “Always verify chip capacity before flashing,” warns Lisek [Elektroda, lisek, post #17129791] Reflash the proper 8 MB or 16 MB dump, then run the 30-press reset.

Why it matters: A 16 Mbit chip flashed with an 8 MB file can leave the board permanently dark.

Quick Facts

• Board variants: LMQ-1 uses 8 MB Winbond 25Q64FV or MX25L6475L [Elektroda, lisek, post #17129791] • Alternative board LMQ-1 with MX25L12873F 16 Mbit chip [Elektroda, lisek, post #17129791] • Replacement MX25L12873F cost ≈ 40 PLN (≈ 9 USD) [Elektroda, lisek, post #17129791] • SoC rail (L1) should read 1.65–1.86 V [Elektroda, lisek, post #17148440] • Typical power-off timeout on corrupt BIOS: ~53 s after power-on [Elektroda, _1KOKO, post #17129328]

How do I tell if my board needs an 8 MB or 16 MB BIOS image?

Check U49; if the package is MX25L64xx or W25Q64, it is 8 MB. If it is MX25L128xx, it is 16 MB [Elektroda, lisek, post #17129791] .

Where can I download a verified BIOS dump for LMQ-1 12298-2 48.4LY07.021?

Registered users on Elvikom can grab an 8 MB tested dump for this board [Elektroda, lisek, post #17129791] Always match the exact board revision before flashing.

What happens if I flash an 8 MB file onto a 16 Mb chip?

The upper 8 MB remain blank, leaving critical ME code missing. The EC then issues the 3-blink error and the laptop shows no video [Elektroda, boro1234567, post #17129498]

Is there a recovery procedure without re-programming tools?

Yes. 1) Disconnect main and CMOS batteries. 2) Press the power key 30 times at one-second intervals, then hold it 30 s. 3) Re-assemble and attach AC power. Some units boot after 15–30 minutes of charging [Elektroda, lisek, #17129395; Karaczan, #17129466].

Will deleting the Intel ME region fix a no-boot state?

Usually no. A missing or zeroed ME region prevents the CPU from exiting reset and still causes a 3-blink halt [“Intel Engine Repositories”]. Re-flash a full dump instead of erasing ME.

What standby voltages confirm the board’s power rails are alive?

Measure on the coils: L1 ≈1.70 V, L3 ≈5.10 V, L4 ≈3.30 V, L5 ≈0.70 V, L28 ≈1.0 V [Elektroda, _1KOKO, post #17148377] If any rail is absent, troubleshoot power circuitry before BIOS.

Can a damaged USB port trigger the symptom?

A shorted D+ or D- can hold the EC in a fault loop, but 150 kΩ resistance and +5 V on the port rule that out [Elektroda, _1KOKO, #17138329; lisek, #17138599].

When should I suspect the i7-4600U CPU itself?

If good rails and a known-good BIOS still give 0.00 A current draw after VRM enable, the 22 nm ULV i7 may be shorted; Lisek calls them “very sensitive” [Elektroda, lisek, post #17148440]

Is swapping the BIOS chip safer than in-circuit flashing?

Many technicians socket a fresh chip pre-programmed with the correct dump to avoid solder-reflow heat on the original. This lets you keep the old chip untouched for rollback [Elektroda, lisek, post #17148710]

Do POST cards help on this platform?

Only if the LPC bus toggles. With a corrupt BIOS the bus stays idle, so most POST cards read 00h [Elektroda, lisek, post #17148477]

Where can I source replacement MX25L12873F or MX25L6475L chips?

Polish parts vendors list MX25L12873F for about 40 PLN [Elektroda, lisek, post #17129791] Global distributors like Mouser and Digi-Key also stock both series for under 4 USD each [Mouser Price, 2024].

Edge case: my X1 Carbon only boots after staying on charge for 20 minutes—why?

A marginal EC firmware or weak RTC capacitor can require extended standby power before the chipset starts. Karaczan observed normal boot after 15–30 minutes in such cases [Elektroda, Karaczan, post #17129466]
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