Asus X512FF - No video

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  • Smoxx
    Member
    • Jun 2019
    • 36
    • Argentina
    #1

    Asus X512FF - No video

    Hi,

    This board had no power. I checked the 5v and 3.3v rails and both were not present.

    In a visual inspection, I found a burned ceramic capacitor under the SSD insulation nearby the audio IC. After replacing the cap I had 19v + 5v + 3.3v again but they were oscillating, so I decided to cleanup the board and after that the voltages became stable and the laptop now turns on but with no video because DDR4 voltage is the only one that is still missing.
    I found that the source of the QM3056M6 ( wich I believe belongs to the 19v rail) and ground are shorted, but even after injecting 1V / 2A in the source, with voltage dropping to 0.04v consuming all the 2A nothing heated.

    I didn't found any boardview for this model, so if anyone have any experience with this board, I would appreciate it.
    Attached Files
    Last edited by Smoxx; 02-04-2021, 01:56 PM.
    Tags: None
    • Smoxx
      Member
      • Jun 2019
      • 36
      • Argentina
      #2
      Re: Asus X512FF - No video

      Ok. Disregard the injection test 'cos by tracing the board I see that's normal behavior in that point. I'm kinda re-learning some stuff...

      But I still would like know what voltage should I have on that mosfets

        Comment

        • Sephir0th
          Badcaps Legend
          • Oct 2020
          • 1262
          • Germany
          #3
          Re: Asus X512FF - No video

          Unfortunately it doesn't seems, there are Schematics available.

          So would you again make a good Pic of the whole Board with Resistance and Voltage measured of all coils to ground? Especially the RAM Coil. Maybe we'll find Something suspicious and can answer the Questions.
          Last edited by Sephir0th; 02-04-2021, 05:24 PM.
          FairRepair on YouTube

            Comment

            • Smoxx
              Member
              • Jun 2019
              • 36
              • Argentina
              #4
              Re: Asus X512FF - No video

              Thanks! I'll post the coils resistance and voltage ASAP.

              For now, I made an identification of the main ICs involved for a better understanding of the board.
              Attached Files
              Last edited by Smoxx; 02-04-2021, 08:20 PM.

                Comment

                • mcplslg123
                  Badcaps Legend
                  • Jun 2015
                  • 7262
                  • india
                  #5
                  Re: Asus X512FF - No video

                  RT8248A is your memory controller. You can download the datasheet of this IC and check voltage on all pins.

                    Comment

                    • Smoxx
                      Member
                      • Jun 2019
                      • 36
                      • Argentina
                      #6
                      Re: Asus X512FF - No video

                      Well, this is what happened...

                      As I said earlier, the board was in a stage of turning on but with no DRAM voltage, thus no video. Also it was turning on by itself everytime I turned it off. I had to disconnect DC/battery everytime.

                      The gate of QM3056M plus the positive of the first 330uf 2.5 elco and ceramic caps nearby were shorted to GND according to continuity test and I repeated the test about 5 times, maybe more.

                      I desoldered all that area to test the components outside the board and all of them were good, then resoldered but same as before. Short, no DRAM voltage and no video.

                      I tried reflashing the BIOS but nothing changed...

                      I basically tested all the caps and ICs in their resistances and voltages across the board manually, one by one, but no sign of issues.

                      Since there weren't many possibilities left, I decided to insist in the first coil area and resolder everything again but this time the short was gone. Even so, I wasn't feeling too much excited about it.

                      So I went to test the RAM voltage and voilá! The 1.2V was finally there in the coil!!!

                      I plugged everything in and the laptop turned on and booted to OS just fine.
                      I even ran some heavy stress tests and the board is running rock solid.

                      So, would this be one of those cases when some residual electricity across the board can cause some kind of temporary short or some other phenomenum?

                      Anyhow, I'd like to thank @Sephir0th and @mcplslg123 for trying to help. I appreciate it!

                        Comment

                        • Sametbey
                          Badcaps Veteran
                          • Jan 2021
                          • 229
                          • Turkey
                          #7
                          Re: Asus X512FF - No video

                          Glad the problem was resolved. static electricity can sometimes make the mosfets unstable. For this, it is useful to disassemble the motherboard completely and keep it waiting for a day.
                          I'm not happy to be so strong. because it's not humanly

                            Comment

                            • Sephir0th
                              Badcaps Legend
                              • Oct 2020
                              • 1262
                              • Germany
                              #8
                              Re: Asus X512FF - No video

                              Glad to Hear and thank you for Sharing your solution!
                              FairRepair on YouTube

                                Comment

                                • Duranitron
                                  Badcaps Veteran
                                  • Jul 2014
                                  • 544
                                  • Philippines
                                  #9
                                  Re: Asus X512FF - No video

                                  congrats!
                                  Never stop LEARNING because life never stops TEACHING!

                                    Comment

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