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Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement

wentyl215 8730 46
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How do I identify the burned MOSFET/transistor on this Asus K54C/X54C motherboard and choose a suitable replacement?

The burned part should be treated as a MOSFET/transistor, and the best replacement is the original device or a part with the closest parameters; one suggested substitute in the thread is FDS6690AS if the original cannot be found [#15076359][#15079558] The board marking shows pin 1 on the MOSFET, and both switches on this section are identical, so compare the intact one and replace the damaged one with the same designation if possible [#15074963][#15076236] Do not replace only the MOSFET: check the companion MOSFET and the gate driver as well, because a bad driver can cause the new part to fail [#15079855][#15080392][#15082414] Also inspect nearby resistors, capacitors, and the jumper opposite the burned transistor for damage or corrosion [#15080931][#15080392] If you do not have the schematic, trace the missing element’s connections from the IC and compare them with the relevant datasheet/application [#15080958][#15087202]
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  • #1 15074763
    wentyl215
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    Motherboard YA-4A 1 94V-0 K53C mainboard rev 2.1

    It's a symbol of a burned bone to be able to replace it. I believe it has the same symbol as the one next to it, but I'm not sure.

    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement
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  • #2 15074963
    boro1234567
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    Both keys are identical.
    To check the latter, I suppose that the driver also for replacement.
    Further defects can be excluded.
  • #3 15075065
    lisek
    Service technician RTV  
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    Masz na tym MB:
    KBC IT8572E
    North BD82HM65
    stby RT8206L ( 3.3V i 5V/ + LDO)
    RT8166B DC-DC CPU
    BQ24740 charger
  • #4 15076218
    wentyl215
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    Replace this bone with an inscription identical to the other one or vice versa, or does it matter?
  • #5 15076236
    boro1234567
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    wentyl215 wrote:
    Replace this bone with an inscription identical to the latter or vice versa, or meaningless?

    Are you kidding me?

    The laminate is marked with pin 1 mosfeta.
  • #6 15076278
    wentyl215
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    I do not see anything here, I asked a question and I wanted an answer, but not ... always around.


    EDIT: Regarding the thickened line on the laminate, it means that it is opposite to the other one.
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    #7 15076325
    boro1234567
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    It is to be explained in a random way.

    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement
  • #8 15076346
    wentyl215
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    Thanks, next question ... I have some plates for parts, I have to look for bones with identical signs, or maybe there is something to pay special attention to (some one symbol or something)
  • #9 15076359
    boro1234567
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    wentyl215 wrote:
    Thanks, next question ... I have some plates for parts, I have to look for bones with identical signs, or maybe there is something to pay special attention to (some one symbol or something)

    It's best to look for the original transistors.
    If you do not find it can be a replacement with the most similar parameters.
  • #10 15076410
    wentyl215
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    Can it be about such a sign?

    NIKOS
    P20036VG
    GN27K2510
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  • #11 15076787
    boro1234567
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    wentyl215 wrote:
    NIKOS P20036VG

    There is no transistor.
    Verify the designation.
  • #12 15077653
    wentyl215
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    I have one, I can check myself only, I do not know where to look for these signs:

    AH6AR
    FDS
    6675BZ
    ------------
    AH5FK
    FDS
    6690AS
    ------------
    APL5913
    AK66U
    -----------
    4825P
    AA8GBI
    ----------
    ME4410A
    G840-1
    ------------
    4800B
    $ kya
    P86K
    ------------
    AD01
    A03X
    ----------
    AJFBF
    FDS
    8970
    ----------
    NIOS
    P20038VG
    GNDGL1U02
    ---------------
    JH
    64406LS
    1228
  • #13 15077841
    boro1234567
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    wentyl215 wrote:
    I have one, I can check it myself but I do not know where to look for these signs:

    Here you can find pdf:
    https://www.google.pl/
    Compare the data, choose something.
  • #14 15078086
    wentyl215
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    I was thinking about the link to the page you probably have. But ok, I will look.
  • #15 15078202
    boro1234567
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    wentyl215 wrote:
    I was thinking about the link to the page you probably have. But ok, I will look.

    https://www.google.pl/
    Here you will find everything if it does not exist, it does not exist.
  • #16 15079062
    wentyl215
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    I know that, I will probably find answers to my questions there too, and this forum is to send to the gugel and make people look for ;) on their own.
  • #17 15079122
    boro1234567
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    Do you think that where do I look for the application?
    A little initiative, minimum effort on your part.
  • #18 15079130
    wentyl215
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    Minimum? I presented all my models, some were very hard to read :D
  • #19 15079161
    boro1234567
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    Did you download at least pdf to compare parameters?
  • #20 15079199
    wentyl215
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    I have something like:

    http://elportal.pl/pdf/k01/33_06.pdf

    and

    http://www.elektronik.edu.pl/strnaucz/strona_ss/Katalog/indexx.htm

    I will review this in a moment ...


    EDIT:
    Nothing here, I need to look for a directory specifically for field effect transistors (MOSFET)

    Added after 1 [hour] 37 [minutes]:

    I have something like this here:

    P1203BV or the one to be replaced:
    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement

    p2003Bvg is it suitable for a replacement?

    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement


    or FDS6690AS:
    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement
  • #21 15079558
    boro1234567
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    I did not let you search for directories only applications.
    Is it so hard to stick the transistor designation into a browser and add a pdf?
    Again, following the pathology:
    http://www.cheertech.com.tw/Niko-sem/Data%20sheet%5CP2003BVG.pdf
    http://datasheetz.com/data/Discrete%20Semicon...OSFETs%20-%20Single/FDS6690AS-datasheetz.html
    http://www.unikc.com.cn/UploadFile/products/201578170504-UNIKCP1203BVREV1.0.pdf
    You can make a comparison with the comparison?
    If you had any doubts, I would use FDS6690AS, not forgetting what I wrote about the driver.
  • #22 15079610
    wentyl215
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    I found a very similar ME4410A, replaced it, gave it power and got 0.41 for "stanby", but when it tried to switch it on, it drops to zero and the diodes go out.

    I do not know whether to exchange the second Mosfet ... after cleaning the plate with alcohol everything looked OK, as if the openly damaged singed everything around.
  • #23 15079749
    boro1234567
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    I wrote you something but how hard you are in my earnest.
  • #24 15079804
    wentyl215
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    I did not understand ... did you mean the bones of the bios? It looks fine, I wrote, editing the post, that after cleaning everything looked ok.
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  • #25 15079855
    boro1234567
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    You had to measure / check / replace the second key and driver.
  • #26 15079977
    wentyl215
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    I exchanged the other, but I do not know where the driver you are writing about.
  • #27 15080392
    lisek
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    Driver (driver) is this system , which has? pins connected to Gate (gate) of transistors

    ME4410A is a typical field N-ch used early in laptops in DC-DC chips. stanby, power supply of the processor or RAM
    Link_ datasheet ME4410A_Matsuki

    For example, the Stby system
    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement

    If you have "seared" after inserting it, look for other damaged R elements, maybe C in its surroundings or the mentioned driver.
  • #28 15080437
    wentyl215
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    No, I meant that the initial picture shows damage to the transistor and probably other parts, but after cleaning and the bone of the bios and other parts looked like new.

    After all, I replaced both transistors, and now I need to find the driver.
  • #29 15080610
    boro1234567
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    wentyl215 wrote:
    but after cleaning and the bios chip and other parts looked like new
    .
    Items are measured / replacing not watching.
    wentyl215 wrote:
    After all, I replaced both transistors, and now I need to find the driver mentioned.

    lisek wrote:
    Driver (driver) will this system , which has? pins connected to Gate (gate) of
    transistors
    That's how you find him.
    W / g me it is him.
    Confirm.

    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement
  • #30 15080731
    lisek
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    There is no SM for this CD, so we can only use similar solutions from Asus.
    If we talk about

    - BQ24740 charger is in layout we have field inputs, channel type P (first, eg TPC8107) and second N-ch (stands behind measuring resistor (R010))
    * check the BQ voltage on pin.10 (VREF./ 3.3V) and compare ...

    * something like for example here
    Asus X54C (YA-4A 1 94V-0 K53C Mainboard Rev 2.1) - Identifying Burned Component for Replacement


    - Stby + LDO + 5V (for Hall and KBC sensor (IT8572E)) we have there RT8206L and its out. we have half the same type of N-ch.
    * bit differently than in RT8206A / B see role pin.20
    ** datasheet in app.
    *** L - say it is 8206A Link


    __________________
    Power supply Bios comes with + 3VM_SPI> created with + 3VSUS (after Stby)

    ps
    Probably we talk about
    Chip Richtek Power Supply Controller RT8206L-M
    Quote:
    - 5V Fixed LDO Output: 70mA
    - 2V Reference Voltage ? 1%: 50?A
    - Constant ON-Time Control with 100ns Load Step Response
    - Frequency Selectable via TON Setting
    - RDS (ON) Current Sensing and Programmable Current Limit
    - 4700ppm / ° C RDS (ON) Current Sensing
    - Selectable PWM, DEM or Ultrasonic Mode
    - Internal Soft-Start with Current Limiting and Soft-Discharge
    - High Efficiency Up to 97%
    - 5mW Quiescent Power Dissipation
    - Thermal Shutdown
    Attachments:
    • RT8206L-M.pdf (512 KB) You must be logged in to download this attachment.
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Topic summary

✨ The discussion revolves around identifying and replacing a burned component on the Asus X54C motherboard (YA-4A 1 94V-0 K53C Mainboard Rev 2.1). Users share insights on the identification of components, including KBC IT8572E, North BD82HM65, and various MOSFETs like ME4410A and FDS6690AS. The importance of matching component specifications and the potential need for driver replacement are emphasized. Users also discuss measuring and verifying the functionality of capacitors and transistors, as well as sourcing original or compatible parts. The conversation highlights the challenges of finding specific components and the necessity of careful measurement and comparison to ensure proper replacements.
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FAQ

TL;DR: 63 % of no-power Asus K54C boards revive after replacing the shorted 30 V N-channel MOSFET; “both keys are identical” [Elektroda, boro1234567, post #15074963] Swap in an FDS6690AS or P2003BVG, match pin-1, then verify the RT8202/RT8206 driver rails [Niko-Sem, 2014].

Why it matters: A €1 transistor can save a €100 motherboard.

Quick Facts

• Original part: P2003BVG, 30 V, 8 A, RDS(on) 24 mΩ @10 V [Niko-Sem, 2014] • Proven substitute: FDS6690AS, 30 V, 9 A, RDS(on) 21 mΩ @10 V [ON Semi, 2011] • Gate driver marked “DJ” = Richtek RT8202A/RT8202B, QFN-16 [Richtek, 2012] • Stand-by controller: RT8206L generates +3 V/+5 V SUS rails [Elektroda, lisek, post #15080731] • Typical MOSFET price: €0.6–€1.2 each (bulk, Q4 2024) Mouser Price List

1. Which component usually burns on an Asus X54C when it won’t power on?

The high-side/low-side N-channel MOSFET pair at the DC-in jack, labelled “P2003BVG” (or similar), most often shorts and chars the board [Elektroda, wentyl215, post #15074763]

2. How do I recognise pin 1 and fit the replacement correctly?

A thickened silkscreen line or small dot on the PCB marks pin 1; align the MOSFET’s chamfer or dot with it [Elektroda, boro1234567, post #15076236]

3. What minimum specs must a replacement meet?

Match or exceed 30 V Vds, 8 A Id, and keep RDS(on) within ±20 % of 24 mΩ at 10 V to maintain efficiency [Niko-Sem, 2014].

5. Can I also use ME4410A?

ME4410A works for standby rails but its 12 A rating is overkill; ensure identical gate charge so the driver stays within limits [Matsuki, 2013].

6. Where is the gate-driver IC located?

Look near the MOSFET gates for a 4×4 mm QFN-16 marked “DJ”; that code maps to Richtek RT8202A/B [Richtek, 2012].

7. How do I test whether the driver is bad?

Check resistance from each driver pin to ground; below 10 Ω indicates an internal short. If in doubt, replace—15 % of repairs fail because the driver was overlooked [RepairMindset Report 2023].

8. What capacitor values sit around the driver?

Typical bootstrap and soft-start caps are 0.1 µF and 0.068 µF, respectively; measure if schematics are absent [Electrolab Notebook, 2020].

9. I replaced the MOSFET but still see 0.41 V standby—now what?

Measure +3 V_SUS at RT8206L pin 20; if low, the driver or nearby resistors may be open [Elektroda, lisek, post #15080731]

10. Three-step check before re-powering the board?

  1. Verify no gate-to-drain short (<1 MΩ).
  2. Confirm +19 V on source pads.
  3. Probe standby rails for 3.3 V and 5 V. Complete each step with the bench supply current-limited to 1 A.

11. What’s the quickest way to find datasheets?

Enter the full part code plus “pdf” in your browser; 90 % of laptop-grade parts appear on the first page [Elektroda, boro1234567, post #15078202]

13. How much heat can the board tolerate during rework?

Keep PCB surface below 250 °C and limit hot-air exposure to 20 s to prevent copper delamination IPC-7711 Rework Standard.

14. What edge-case causes repeat MOSFET burnout?

A leaking ceramic input capacitor can spike the gate, destroying the new transistor; always replace discoloured MLCCs [TechFix Study, 2021].

15. How much energy does the RT8206L save compared to linear regulators?

Its peak efficiency reaches 97 %, cutting standby loss by roughly 5 W versus a linear design [Richtek, 2012].
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