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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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  • #31 15080912
    wentyl215
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    Thank you for both answers, but before doing so I would like to point out that I have gone a bit and I have not detected one more defect ... now as I was looking for this driver I noticed the following loss, it is almost exactly on the other side of the burned transistor:

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

    Was there an element there?
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  • #32 15080931
    boro1234567
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    wentyl215 wrote:

    Was there an element there?

    No, it's a jumper.
    Remove the driver because it looks suspicious, traverse these corroded capacitors.
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  • #33 15080958
    lisek
    Service technician RTV  
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    We write, NONE SM
    You have a plate in front of you> suck the app standing there and the meter set to ohms (with the power supply and Aku off) measure the transition from the IC to the pin of the missing element.

    Then compare with the IC application

    _________________
    You do not have an MB sticker with the word style
    Quote:
    K54C REV: 3.0 60-N9TMB1500-A31


    ASUS K54C REV 2.1 (69-N0MDM10B11P)
    - BD82HM65
    - KBC IT8572E

    Asus A54C K54C X54C Motherboard
    P / N N9TMB1100-B24
    K54? Main Board Rev 2.1 (W / USB 3.0)
  • #34 15081031
    wentyl215
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    Before I remove the driver ... setting the meter to 20k I have such measurements:

    Both marked in yellow are loaded up to about 19 and later the meter indicates 0L, if I do the opposite measurement, it both stands at 1.17

    Nothing shows on the blue, vice versa too.

    On pink it only shows on one page 17.40, on the contrary nothing.

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

    I really do not know what's going on, but obviously something is not playing here, so before I remove the driver, maybe something here?
  • #35 15081139
    boro1234567
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    wentyl215 wrote:

    Both marked in yellow are loaded up to about 19 and later the meter indicates 0L, if I do the opposite measurement, it both stands at 1.17
    Nothing shows on the blue, vice versa too.
    On pink it only shows on one page 17.40, on the contrary nothing.

    Use some names, units, signs is a technical forum, no coloring pages.
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  • #36 15081302
    wentyl215
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    I am sorry, not these ranges :P Measured capacity of capacitors with a 2u range:

    Yellow bottom .097uF and upper .001uF
    Blue .055uF
    Pink .097uF
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  • #37 15081320
    boro1234567
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    wentyl215 wrote:
    Sorry, not these ranges :P Measured capacity of capacitors with 2u range:

    Yellow bottom .097uF and upper .001uF
    Blue .055uF
    Pink .097uF

    Measured desoldered from the plate?
  • #38 15081341
    wentyl215
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    On taken out:

    Yellow top .700uF down .019uF
    Blue .044uF
    Pink .080uF
  • #39 15081663
    boro1234567
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    Unfortunately, this is nothing to reality.
    What about this driver?
  • #40 15081906
    wentyl215
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    what are the values to be there? can he change? I will take the driver out around noon

    Added after 1 [hour] 49 [minutes]:

    I have a desoldered driver, how should I measure it? There according to the scheme given by the fox?
  • #41 15082414
    boro1234567
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    Syfu was not under the chip?
    It's best to substitute the driver, you will not check it in a simple way.
  • #42 15082437
    wentyl215
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    There was no muck, everything looks OK. I have some old boards for parts, how to find the right one? So what about these capacitors?
  • #43 15082935
    boro1234567
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    wentyl215 wrote:

    I have some old boards for parts, how to find the right one?

    With the same designation.
    wentyl215 wrote:
    Well, what about these capacitors?

    I do not have documentation so I do not know the value.
  • #44 15082957
    wentyl215
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    Designation DJ-DL and below Q1A - where will I find the correct values of the capacitors?

    EDIT:
    I do not have such a driver, so I think I will solder it and replace the capacitors, if I find what to have :D values
  • #45 15086610
    lisek
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    Richtek description
    Quote:
    DJ = - RT8202AGQW
    DJ- - RT8202APQW

    housing QFN-16
  • #46 15087159
    wentyl215
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    Lisek is no longer relevant because I do not have such a driver, I shoot capacitors, I only need their values ...
  • #47 15087202
    lisek
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    I was writing
    Post # 33 19 Oct 2015 20:58
    Quote:
    We write, LACK SM
    You have a plate in front of you> suck the app standing there and the meter set to ohms (with the power supply and Aku off) measure the transition from the IC to the pin of the missing element.

    Then compare with the IC application
    DJ-DL


    Application eg. Link_ datasheet
    or in many laptops from different manufacturers> the option of Search the forum
    e.g. Wistron LA56
    Asus 1201T
    Asus K40AA rev.1.2 in app.
    Attachments:
    • K40AA_r1_2.pdf (1.3 MB) 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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