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X540UV rev. 2.0 - after flooding it boots without image. Need boardview

mmth1996 3756 4
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  • #1 19039141
    mmth1996
    Level 4  
    Good day,
    The X540UV rev 2.0 board from ASUSA after flooding. After cleaning and replacing the damaged components, it boots with no image. The current voltages on the chokes are 3.3V, 5.1V, 1.230V and 1.025V. One choke from the CPU has 1.025V, and the other two have 0V. A voltage of 19V reaches the mosfets, but the mosfets do not open.
    In the picture I marked the mosfets, from two gates lead to the adjacent NCP81236A (I could not find the datasheet), and the other two gates I do not know where they have a connection.
    CPU is SR342
    Does anyone have a boardview? I don't know where to look for the fault, the flooded areas are cleaned, I replaced the eaten parts with new ones.
    X540UV rev. 2.0 - after flooding it boots without image. Need boardview .
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  • #2 19039262
    lisek
    Service technician RTV
    You have boardview from Asus X542UQ X542UQR Rev2.0
    - same chip for cpu NCP81236A qfn52
    * in China 5pcs (NCP81236AMNTXG NCP81236A 8136A) is 8.$

    X540UV rev. 2.0 - after flooding it boots without image. Need boardview X540UV rev. 2.0 - after flooding it boots without image. Need boardview
    Quote:
    pin.12 19V, pin.13 VCC has 5V, pin.14 4.5 V, pin.22 empty, pin.26 4.5 V, pin.39 for which all the way to the CPU power supply power stage open(the other way is no post-stage driver chip, directly to the upper and lower tubes), a red table to measure this foot on the protection, pin.41 is open 3.3 V, pin.42 is IMVP8_PWRGD 3.3 V, now the question is, CPU power supply is not out, why pin.42.... Through the timing, found that PCH_SUS_STAT#(including and after) are no voltage,before all signals and voltages are normal, PLT_RST#no voltage, this should be CPU power supply is normal, there will be a reset



    * no NCP datsheet...., but look after the similar RT8820AGQW ( RT8815A)
    * see if this one doesn't approach NCP81232 qfn40
    Link


    :?:
    1. Nothing "decayed" from the tracks?
    2. How long was it in flooded condition until washed?
    2a. Flooded (with what) when it was used, or was it turned off?
    3. Measure the +NVVDD resistance (0.9V) of the graphics chip, it is supposed to be infinity b.a lot

    Your board is
    -cpu i5-7200U
    - Winbond 25q64fsq
    - kbc IT8995e-DXA
    * batch for kbc you have in head Bios from line( $Revision)
    -charger BQ24708S
    - gpu ? GPU- N16S-GTR-S-A2
    - or ?nVidia N16V-GMR1-S-A2 plus 2x Micron RAM (MT51J256M32HF-70)

    adf744bb6 X540UV rev. 2.0 - after flooding it boots without image. Need boardview X540UV rev. 2.0 - after flooding it boots without image. Need boardview

    Such for entertainment video of flooded wash.... Link
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  • #3 19039303
    mmth1996
    Level 4  
    1. tracks as well as other parts look good, parts over-eaten due to flooding I replaced
    2. 4 days and the owner tried to start it + dryer marks on palmrest :|
    2a. Flooded used, I do not know what, but it is not any juice or beer. A slight white residue was left on the PCB.
    3. integrated graphics

    Thanks for the boardview, today I can't, but tomorrow from the morning I'm getting to work.
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  • #4 19039321
    lisek
    Service technician RTV
    Quote:
    4 days and the owner tried to start it +dryer marks on the palmrest


    which means NCP plus field plus ? cpu ... to replace
    *since the graphics in the cpu (without NVidia)
  • #5 19052446
    mmth1996
    Level 4  
    Over the weekend I purchased a defective motherboard from which I soldered the NCP. After soldering NCP to my patient, there was a voltage of about 1.015V on one choke and on the other sometimes the meter will show something. The processor after connecting the power supply so hot that your finger burned - it heats up immediately. Also problem solved :) CPU failed
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