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Asus R556L i5 / 820M Laptop - Matrix Blinks Under Specific Battery Conditions

Talibanczyk 12393 13
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  • #1 16967958
    Talibanczyk
    Conditionally unlocked  
    Posts: 2547
    Help: 115
    Rate: 75
    I have a rather specific problem.
    The matrix in the laptop blinks, but only in specific conditions.
    Namely:

    1.Laptop Must work on battery power (there are no such symptoms on the charger)
    2. The battery level must be less than 50% (when the battery is full or almost full symptoms do not occur)
    3. The more loaded the laptop, the more often the screen blinks.


    [Film: 6143f14be6] https://filmy.elektroda.pl/56_1516190505.mp4 [/ film: 6143f14be6]
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  • #2 16968045
    RADU23
    VIP Meritorious for electroda.pl  
    Posts: 20712
    Help: 2425
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    Tried a colleague to replace the battery with another?
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  • #3 16968071
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6307
    Rate: 6802
    Measurements on the system Charger.
    BatMonitor what does it show?

    About Asus R556L a little on the forum wrote ...
    Enter descriptions from the CD (e.g. x555ld Rev: 2.0) / there were several rev.
    * or description Asus p.nr.n .: e.g. PN: 60NB0640-MB1802, 60NB0620-MB1911.

    Plate e.g. x555ld Rev: 2.0 was i5-4210U (SR1EF)
  • #4 16970154
    Talibanczyk
    Conditionally unlocked  
    Posts: 2547
    Help: 115
    Rate: 75
    REV 2.0

    From what I read on the net, replacing the battery does nothing

    I met with the opinion that it is a tape - I do not believe it.

    Replacement batteries are not available and hard to find anyway.

    below are screenshots from batmoon both how it is connected and how it is disconnected.


    Asus R556L i5 / 820M Laptop - Matrix Blinks Under Specific Battery Conditions Asus R556L i5 / 820M Laptop - Matrix Blinks Under Specific Battery Conditions

    ps this is not the fault of the graphics card because I turned it off in the device manager - first one and then the other and the effect is the same
  • #5 16970234
    RADU23
    VIP Meritorious for electroda.pl  
    Posts: 20712
    Help: 2425
    Rate: 1726
    Talibanczyk wrote:
    I met with the opinion that this is a tape

    Talibanczyk wrote:
    1.Laptop Must work on battery power (there are no such symptoms on the charger)

    One denies the other. If the tape was to blame, the same symptom would be on the charger (90%).
  • #6 16970253
    Talibanczyk
    Conditionally unlocked  
    Posts: 2547
    Help: 115
    Rate: 75
    RADU23 wrote:
    Talibanczyk wrote:
    I met with the opinion that this is a tape

    Talibanczyk wrote:
    1.Laptop Must work on battery power (there are no such symptoms on the charger)

    One denies the other. If the tape was to blame, the same symptom would be on the charger (90%).


    I am also of a similar opinion, although today I will be in the warehouse and check until the cost is low. about PLN 20
  • #7 16970267
    xoree
    Level 30  
    Posts: 1558
    Help: 129
    Rate: 174
    The question is because I haven't read it or there is no such information as the original charger or a replacement?
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  • #8 16970314
    Talibanczyk
    Conditionally unlocked  
    Posts: 2547
    Help: 115
    Rate: 75
    Both the org and the laboratory power supply - but what has to do with each other as here is about the operating conditions on the battery and not under the charger.
  • #9 16970349
    xoree
    Level 30  
    Posts: 1558
    Help: 129
    Rate: 174
    I had such a situation that a poor replacement power supply blew the gate in front of the charger inverter and that is how the matrix was blinking. The power supply itself was good.

    And it was also Asus only X551 ...
  • #10 16970427
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6307
    Rate: 6802
    You have the x555ld Rev: 2.0 disc
    kbc it8585e.
    charger bq735

    You have MS and popapłam (e.g. p. 2), think and ... give the result
    Attachments:
    • X555LD_RG.pdf (1.29 MB) You must be logged in to download this attachment.
  • #11 16970935
    cezaro2
    Level 13  
    Posts: 40
    Help: 5
    Rate: 7
    Matrix replacement usually helps.
    Check if you set the brightness to 100% on battery power and the flashing will stop.
  • #12 16972838
    Talibanczyk
    Conditionally unlocked  
    Posts: 2547
    Help: 115
    Rate: 75
    lisek wrote:
    You have the x555ld Rev: 2.0 disc
    kbc it8585e.
    charger bq735

    You have MS and popapłam (e.g. p. 2), think and ... give the result


    I understand up1589 for exchange
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  • #13 16973015
    nuda
    Level 18  
    Posts: 566
    Help: 22
    Rate: 30
    First, upgrade the bios, if that does not help, uninstall Asus power management software (if installed).
    I had a similar symptom only the backlight went out completely, no matter whether on the charger or on the battery.
    Here, damage to the tape or matrix would be ruled out if it works properly on the charger.
    And enter the bios (f2 during startup) on the battery itself and on the charger, see if the image blinks if so you can exclude the problem of the software, but only after updating the bios to the latest version.
  • #14 16973076
    xoree
    Level 30  
    Posts: 1558
    Help: 129
    Rate: 174
    Talibanczyk wrote:
    I understand up1589 for exchange


    Did you take the measurements
    What tensions do you lack?

    Added after 1 [minutes]:

    cezaro2 wrote:
    Matrix replacement usually helps.
    Check if you set the brightness to 100% on battery power and the flashing will stop.


    Excuse me ?

    Added after 2 [minutes]:

    nuda wrote:
    First, upgrade the bios, if that does not help, uninstall Asus power management software (if installed).
    I had a similar symptom only the backlight went out completely, no matter whether on the charger or on the battery.
    Here, damage to the tape or matrix would be ruled out if it works properly on the charger.
    And enter the bios (f2 during startup) on the battery itself and on the charger, see if the image blinks if so you can exclude the problem of the software, but only after updating the bios to the latest version.


    Reprogramming the BIOS with the latest batch is not a bad idea ...
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Topic summary

✨ The discussion revolves around a specific issue with the Asus R556L laptop, where the screen matrix blinks under certain battery conditions: when operating on battery power, below 50% charge, and under heavy load. Users suggest various troubleshooting steps, including replacing the battery, checking the charger, and updating the BIOS. Some believe the issue may be related to the internal connections or the display matrix itself, while others argue that the problem does not stem from the graphics card since the symptoms do not occur when plugged into the charger. Recommendations include testing with different power supplies and ensuring the brightness is set to maximum on battery power.
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FAQ

TL;DR: 90% of cases point away from the LCD cable; “If the tape was to blame, the same symptom would be on the charger (90%).” [Elektroda, RADU23, post #16970234]

Why it matters: This FAQ helps Asus R556L/820M owners diagnose battery-only screen flicker and choose the fastest, lowest-cost fix.

Quick Facts

Why does my Asus R556L/820M screen blink only on battery?

The thread links the flicker to battery operation and load. It does not occur on AC. The effect grows as system load rises, and it appears when charge falls below about 50%. That pattern suggests power-management paths on the battery rail rather than the LCD cable or panel itself. [Elektroda, Talibanczyk, post #16967958]

Is the LCD cable (“tape”) the culprit for battery-only flicker?

A veteran poster argues no: if the cable were faulty, the symptom should also appear on the charger. Quote: “If the tape was to blame, the same symptom would be on the charger (90%).” That points diagnostics toward power delivery and firmware first. [Elektroda, RADU23, post #16970234]

Will cranking brightness to 100% on battery help?

One technician reports that maxing brightness on battery stopped the flashing. This is a quick test to see if the dimming curve or PWM region triggers instability. If it helps, focus on backlight control and power profiles next. [Elektroda, cezaro2, post #16970935]

Should I try a different battery pack?

Yes. A moderator-level voice immediately asked about testing with another battery. A weak or aged pack can sag under load, provoking backlight or panel rail dips. Swap-in testing isolates whether the pack or the board-side regulation is at fault. [Elektroda, RADU23, post #16968045]

Which board revision and power chips does this model use?

Contributors identified the board as X555LD Rev. 2.0 with an IT8585E KBC and a charger IC noted as bq735. Target your voltage checks and schematics accordingly when probing battery and backlight rails. [Elektroda, lisek, post #16970427]

Should I update BIOS or remove Asus power management first?

Yes. Update BIOS to the latest, then uninstall Asus power management if present. Next, boot into BIOS on battery and on AC to see if flicker persists. This separates firmware or OS-level dimming from hardware issues. [Elektroda, nuda, post #16973015]

How do I quickly isolate software vs. hardware causes?

Try this: 1. Update BIOS and reboot. 2. Uninstall Asus power utilities in Windows. 3. Reboot and test in BIOS (F2) on battery and AC; if it flickers in BIOS, pursue hardware power/backlight paths. [Elektroda, nuda, post #16973015]

Could a third‑party charger have caused related damage earlier?

Yes. One user saw a poor replacement charger blow a gate in the charger/inverter path on an Asus X551, leading to matrix blinking. Edge case, but it shows upstream faults can cascade into display symptoms. [Elektroda, xoree, post #16970349]

Does the GPU matter here?

The reporter disabled first one GPU, then the other, with no change. That strongly argues the backlight/power path rather than the Intel/NVIDIA rendering pipeline as the root cause. [Elektroda, Talibanczyk, post #16970154]

What should BatMon/Battery Monitor data tell me?

A senior member asked for BatMon readings. Capture voltage, current, and wear while on battery and while charging. Look for voltage sag correlating with flicker events to confirm a supply-side issue. [Elektroda, lisek, post #16968071]

Is replacing the LCD matrix a valid fix?

One member notes matrix replacement often helps. Use brightness-at-100% as a triage test. If that removes flicker, the panel’s backlight driver or related control range may be sensitive. Consider panel swap after power tests. [Elektroda, cezaro2, post #16970935]

Is UP1589 the part to replace?

The original poster asked if UP1589 was the suspect. That reflects a focus on local power conversion. Verify with measurements first, then decide on regulator replacement only if you confirm out-of-spec rails. [Elektroda, Talibanczyk, post #16972838]

How does system load affect blinking frequency?

The reporter observed more frequent blinking as load increased. That behavior supports the hypothesis of power rail droop or transient response limits on battery, not a static cabling fault. [Elektroda, Talibanczyk, post #16967958]

Does testing in BIOS really matter?

Yes. Enter BIOS (F2) on battery and AC after updating firmware. If the screen blinks even in BIOS, the OS and drivers are not to blame. Proceed with hardware rail and backlight checks. [Elektroda, nuda, post #16973015]

What’s the cost to trial an LCD cable swap?

The OP planned to test a warehouse cable because the part cost was about PLN 20. A low-cost swap can rule out cable issues without heavy diagnostics time. [Elektroda, Talibanczyk, post #16970253]
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