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Toshiba Satellite L50-b request for identification of the resistor.

mar123cin 13194 15
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How can I identify the value of the burned resistor marked R391 on a Toshiba Satellite L50-b motherboard DABLIDMB8E0 rev. E?

Replace R391 with a zero-ohm resistor, but the thread indicates the real fault is a short on the KBC NPCE985LA0DX, so the KBC also needs to be replaced [#15003850][#15044586] The board had no 3.3 V on KBC pin 4 (VDD); one pad of R391 had 3.3 V while the other had no voltage, and resistance checks showed about 800 Ω on one side and a short to ground on the other [#15003554][#15003628] The KBC pin 4 measured about 2 Ω to ground, which strongly suggested a short in the KBC area [#15003782] A service power supply and fault test were suggested to confirm the diagnosis [#15003939] After replacing the KBC and fitting a zero resistor, the board worked [#15044586]
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  • Request to identify burned resistor R391 on DABLIDMB8E0 Rev E

    #1 15003057
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    Toshiba Satellite L50-b request for identification of the resistor.

    Hello, I have been struggling with the motherboard from the Toshiba Satellite L50-b for a long time, namely with a resistor which has been burned, unfortunately there are no markings on it, and the scheme is not available and here is a request to colleagues who are more familiar with the topic for identification the resistance of this element, the mark on the board is R391, the motherboard DABLIDMB8E0 REV: E
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  • #2 15003107
    boro1234567
    IT specialist  
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    Paste the macro image of the resistor area.
  • #3 15003149
    lisek
    Service technician RTV  
    Posts: 39995
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    Quanta BLID (DABLIDMB8E0 rev.E) does not have SM.
    Write what KBC do you have?
    * hard to see on the photo.

    On the "upright" Satellite L750 / L755 DABLBDMB8E0 Quanta BLBD with KBC U7 NPCE791LA0DX
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  • Quanta BLIDMB8E0 lacks schematic; identify the KBC

    #4 15003363
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    boro1234567 wrote:
    Paste a macro photo of the resistor area.

    The picture quality is high after zooming in, the resistor area is very well visible. Greetings.


    lisek wrote:
    There is no SM on this Quanta BLID platform (DABLIDMB8E0 rev.E).
    Write what KBC do you have?
    * hard to see on the photo.

    On the "close" Satellite L750 / L755 DABLBDMB8E0 Quanta BLBD with KBC U7 NPCE791LA0DX


    The NCB is: NPCE985LA0DX
    Greetings.
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  • #5 15003519
    boro1234567
    IT specialist  
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    mar123cin wrote:

    The picture quality is high after zooming in, the resistor area is very well visible.

    That's how I like that I like cool photos.
    How does the motherboard behave without this resistor?
    What are the tensions on his pads?

  • Resistor interruption cuts 3.3 V to KBC VDD

    #6 15003554
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    boro1234567 wrote:
    mar123cin wrote:

    The picture quality is high after zooming in, the resistor area is very well visible.

    That's how I like that I like cool photos.
    How does the motherboard behave without this resistor?
    What are the tensions on his pads?


    That's all I got from my damaged Nikon.
    The board does not start, no 3.3v on the 4 (VDD) leg at the KBC, it turns out that it is connected to this resistor, 3.3v is on one pad and none on the other.
  • #7 15003592
    boro1234567
    IT specialist  
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    Resistance from pads in relation to mass?
  • #8 15003628
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    boro1234567 wrote:
    Resistance from pads in relation to mass?


    On one pad of what is 3.3v is 800 Ω on the second .000 short circuit
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  • #9 15003750
    boro1234567
    IT specialist  
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    If it's the way you write, the resistor did not damage for no reason.
    It looks like a short circuit.
    What resistances do you have on the 4 KBC pin?
    Can you throw the photo plates from both sides?
  • #10 15003782
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    I also suspect that the reason must be, in KBC on foot 4 are 2 Ω in relation to mass

    Toshiba Satellite L50-b request for identification of the resistor. Toshiba Satellite L50-b request for identification of the resistor.
  • #11 15003850
    boro1234567
    IT specialist  
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    Then replace the NCB and solder a zero resistor.
  • #12 15003866
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    so it turns out that there is a short circuit to mass at KBC ?? I'm asking because I do not have much to do with the discs.
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    #13 15003939
    boro1234567
    IT specialist  
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    The service power supply and fault test will dispel any doubts.
  • #14 15003946
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    boro1234567 wrote:
    The service power supply and short circuit test will dispel any doubts.


    Thanks for the help I will continue to cheat. Best regards.
  • #15 15004010
    lisek
    Service technician RTV  
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    Quote:
    KBC is: NPCE985LA0DX

    Such NCB you have for example MB also from Toshiba (DA0BDDMB8H0 rev: H) or Quanta BDD platform, based on
    Quote:
    i7 4700MQ, HM87, NPCE985LA0DX, MXM3 N14E-GS-A1


    The same NCB in the DA0BD9MB8F0 platform, Quanta BD9M> see appendix
    Quote:
    AMD Dual-Core A6-5200 processor
    GPUs in the Accelerated Processor with AMD Radeon HD 8400 Graphics
    KBC NPCE985LA0dx
    Attachments:
    • _Quanta_BD9.pdf (1.25 MB) You must be logged in to download this attachment.
  • #16 15044586
    mar123cin
    Level 10  
    Posts: 8
    Rate: 3
    Substitution KBC solved the problem with shorting, resistor replaced with zero, so far works.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around identifying a burned resistor (R391) on the motherboard of a Toshiba Satellite L50-b (DABLIDMB8E0 REV: E). The user provided a macro image of the resistor area and mentioned that the motherboard does not start, with no 3.3V on one of the KBC pins. Various users suggested checking the resistance values and potential short circuits. The user confirmed a short circuit and low resistance readings on the KBC pin. Ultimately, replacing the KBC resolved the shorting issue, and a zero-ohm resistor was used as a substitute for the burned resistor, restoring functionality.
AI summary based on the discussion. May contain errors.
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