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Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

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    #21
    Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

    Originally posted by Aeridyne View Post
    U101 is
    A1
    AS1117L-33
    B0815 D1

    it measures, with black lead on top "fat" tab, from left to right
    3.2V / 0 / 1.8
    FAT TAB is not GND, that fat tab and the center pin are connected together internally and they are OUTPUT pin.
    You need to use circuit GND such as GND pin of the connector.
    It is 3.3V fixed LDO regulator 1117 series IC, so if you look at the device with the tab up: Left pin is GND, Center pin is OUTPUT (should show 3.3 VDC), Right pin is INPUT (should show 5 Vdc)
    Attached Files
    Last edited by budm; 01-17-2017, 01:45 PM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment


      #22
      Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

      sorry, I don't know how to delete, I refreshed the page multiple times but I didn't see your reply until I had posted, I will check it according to the new information you have provided.
      Last edited by Aeridyne; 01-18-2017, 10:35 AM.

      Comment


        #23
        Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

        It seems to be working. Measuring with orientation as the fat tab north & the black lead on the left leg (ground), the right most tab shows 4.97V and the center pin and the fat tab / output both show 3.27V

        Comment


          #24
          Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

          Yes, it is good and the output is within spec. More in-depth troubleshooting of the main board is required. may have corrupt firmware, etc.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment


            #25
            Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

            Ok. Not sure how to go further in depth myself. That V reg was as far as I had gotten.

            Comment


              #26
              Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

              Did you try heating the main/logic board with hair dryer for 2~3 minutes first and then power it up to see what happen, and also cooling it using canned air duster upside down?
              BTW, since the monitor has VGA and DVI, when try using either of them, it does the same problem?
              Last edited by budm; 01-19-2017, 11:37 AM.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment


                #27
                Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                Hi Aeridyne, i suggest you to find the program Moninfo from EnTech Taiwan, use it on a pc with first a good monitor, to be able to open the prog., then attach a faulty one and do a grab command to the prog, so it reads EDID data from the monitors, i suspect that those series of monitors has edid eeproms prone to fail.. find the way you want to pubblish the result screens of the prog, so we can see them. Try with all the monitors you have if you want, especially if you see garbled / suspecting data..

                Comment


                  #28
                  Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                  I will try those three suggestions and post back soon. Knee deep in a home movie project for someone atm.

                  Comment


                    #29
                    Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                    nailed it.if you have one that works 100% clone eeprom.
                    Originally posted by Davi.p View Post
                    Hi Aeridyne, i suggest you to find the program Moninfo from EnTech Taiwan, use it on a pc with first a good monitor, to be able to open the prog., then attach a faulty one and do a grab command to the prog, so it reads EDID data from the monitors, i suspect that those series of monitors has edid eeproms prone to fail.. find the way you want to pubblish the result screens of the prog, so we can see them. Try with all the monitors you have if you want, especially if you see garbled / suspecting data..

                    Comment


                      #30
                      Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                      Well, in conclusion here, it seems the issue was actually the backlights all along. If I took good working backlights from other stuff and plugged them in to either of the test boards I had they would stay on. Not having any way to purchase backlights for them all I gave up actually repairing them, but I feel I did figure out the real problem.

                      Comment


                        #31
                        Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                        But does not make any senses since the backlights are just the light source it could not careless if the monitor is connected the PC with 98 640 res or not. It sounds like the provided DATA is wrong.
                        Post#1:
                        "The curious exception to this, is if I connect one to a Windows 98 system set to 640x480 display. They will usually display this. Not always but usually. I can disconnect and reconnect the VGA and it will usually come up and display and stay on. Not always, usually. I've gotten one to display an XP system and stay on once, and flash quickly a few times, but almost always it does nothing."
                        Last edited by budm; 04-21-2017, 09:59 AM.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment


                          #32
                          Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                          Hi, I have very similar symptoms on my Acer v173. When without signal is showing ACER logo and after that "no signal" information. When I connect VGA cable from the laptop it stays in the black screen with blue LED on, or the monitor is resetting with approx 3-4 s orange LED to blue LED light. I tested also BIOS mode for lower resolution but this no helped.

                          Comment


                            #33
                            Re: Six Acer V173 LCD monitor all with same problem, only display Win 98 640res

                            I have another faulty V173 showing Acer logo. Is like the MCU find every VGA signal as incomplete and went to a "parking" mode turning off backlights. I dissasembled the panel to see if there is an image without backlight but the LCD appears turned off completely.

                            I found a Service manual for a very similar monitor (same control board) and there is no hope: "No Image" troubleshooting end very fast with "change scaler and mcu" RTD2120L and RTD2025

                            https://www.manualslib.com/manual/23...page=35#manual

                            This fault is so pervasive and have same symptomps clearly these realtek chips had a point of failure.
                            Last edited by 1fg52; 06-13-2021, 12:09 PM.

                            Comment

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