Asus g751jy no picture, fans at max...

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  • myth77
    Badcaps Veteran
    • Feb 2017
    • 380
    • Croatia

    #1

    Asus g751jy no picture, fans at max...

    I have this asus for about one year, excellent condition, never had any problem...last month it was stormy and i was using ethernet cable, not wifi...there were lot of lightning strikes..then power surge...laptop completely shuttdown. I left it till the morning, and when try to turn it on, nothing...dead...so i decided to completely dismental it. So, when i had only motherboard in fron of me i tried again, but nothing...so i look closely and i could see that the realtek chip 8111-gux is completely burned/destroyed. So i decided to desolder it. It is a ethernet chip. After that i tried to turn it and yes...it powers on...but after a few seconds the fans start to spin on maximum. Oh, i forget to mention that thi motherboard has CPU and GPU chips integrated. So i tried to clean it, put keyboard back, and blueray and lcd...but no picture...black screen. When i press power button it shows power button on, it is charging the battery, backlights on keyboard are on and i can see blueray is reading the dvd rom in it...first few seconds the left fan is working slowly then it start spinning at max, also the right fan.
    I ordered the new realtek chip but while i am waithing, i am wondering did something else burned also. Could missing realtek chip cause no picture and fans at max or there is something more. Any ideas what and where to check?
  • jasko_jacker
    Badcaps Legend
    • Oct 2014
    • 1137
    • italy

    #2
    Re: Asus g751jy no picture, fans at max...

    The system must work even without the LAN chip.
    Check if there are no shorts on Vin LAN chips, try to reprogram the bios and if it is on another memory even the EC.
    The PCH is built in the same chip of the CPU ?

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    • myth77
      Badcaps Veteran
      • Feb 2017
      • 380
      • Croatia

      #3
      Re: Asus g751jy no picture, fans at max...

      Originally posted by jasko_jacker
      The system must work even without the LAN chip.
      ok, i thought so...
      Originally posted by jasko_jacker
      Check if there are no shorts on Vin LAN chips, try to reprogram the bios and if it is on another memory even the EC.
      I understand LAN chips, but what is Vin Lan?

      Originally posted by jasko_jacker
      The PCH is built in the same chip of the CPU ?
      no, it has HD82HM87 intel haswell chip.

      I attached the picture of the motherboard (not original), and boardview...
      Attached Files

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      • jasko_jacker
        Badcaps Legend
        • Oct 2014
        • 1137
        • italy

        #4
        Re: Asus g751jy no picture, fans at max...

        Because U1101 intel DSL5110 it's connected with EC ITE8585SV probably there is an issue on the EC, check around U3001 if you see some component damage and check if U3001 is hot. It's not simple to find the problem without having the motherboard.
        1 - U2801 MAIN BIOS -> REPROGRAM
        2 - U1102 EC MEM -> REPROGRAM
        if reprogram bios and ec don't solve the problem change the U3001 but but some checks would be required
        Attached Files

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        • myth77
          Badcaps Veteran
          • Feb 2017
          • 380
          • Croatia

          #5
          Re: Asus g751jy no picture, fans at max...

          Sorry for late reply i was on a business trip...

          U3001 is heating but not overheating, while working of course...i finger checked and it is on working temperature, didnt need to measure it...

          Using attached boardview and multimeter i found that on all 12V nets i read 13,56 volts...also on +3V3_AON net multimeter is not reading any voltage, and on +3V3_main and +3v3_VDD multimeter reads 0,65 V. I dont think this is normal? or?

          I didnt found any traces of damage in the area you suggested but i did found some traces of damage on U2801 and...pictures attached if you se something more...this looks like damaged but it seems only on surface.
          Attached Files

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          • myth77
            Badcaps Veteran
            • Feb 2017
            • 380
            • Croatia

            #6
            Re: Asus g751jy no picture, fans at max...

            Anyone? Thank you

            Comment

            • cacla
              Badcaps Veteran
              • Apr 2015
              • 442
              • /

              #7
              Re: Asus g751jy no picture, fans at max...

              You reprogram main bios?

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