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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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  • #31 17148504
    lisek
    Service technician RTV  
    Posts: 39712
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    And what's harmful, buy a new layout under Bios, upload my and check.
      :idea: Maybe it will work?
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  • #32 17148618
    _1KOKO
    Level 33  
    Posts: 2253
    Help: 223
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    The bone is efficient because the programmer is screaming when it is damaged.
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  • #33 17148710
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6307
    Rate: 6802
    Quote:
    And what's wrong, buy a new layout under Bios, upload my and check.

      :idea: I mean:
    1. displace your layout with Bios
    2. upload my Bios batch into a new bone (from the store or whatever)
    3. see the effect, describe
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  • #34 17207919
    _1KOKO
    Level 33  
    Posts: 2253
    Help: 223
    Rate: 164
    The subject to close, unfortunately the client receives the laptop without repair, thank you all for helpful posts and attachments.
  • #35 21306576
    kuras123
    Level 11  
    Posts: 22
    Hello
    When playing around with the BIOS swap I have the same effect. After uploading the original BIOS, the laptop does not turn on. Will the me region, if deleted, help anything?
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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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