iiyama e2202wsv prolite, stop after 5 sec

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  • perette
    Senior Member
    • Mar 2013
    • 71
    • france

    #1

    iiyama e2202wsv prolite, stop after 5 sec

    Hi everybody

    I have a problem that seems to be common on this monitor (same as a adepia tgl 2020 (service manual there) and AOC TFT22W90PS, plus many other)

    The screen powers on, display a "no cable" if no cable connected and then turn to black with the led to orange. And if i push the power button, it switches of and can restart doing the same again. I do not see any image.

    I haven't find a usable answer on the web (maybe I'm not searching the right way), I ask your help to try to resurrect the monitor.

    I've suspected the PSU (715g2510-1) but no caps damaged (visibly), not trace of burn.

    I've tried to test some key components (as recommended in a previous subject there)

    What can i try to find were the problem comes from.

    thanks (PS, I can play with it only the week end, so this can take a little time)
    Attached Files
    Last edited by perette; 03-04-2013, 04:36 PM.
  • RethoricalCheese
    Badcaps Legend
    • Mar 2013
    • 1517
    • Estonia

    #2
    Re: iiyama e2202wsv prolite, stop after 5 sec

    For me it seems like controllerboard (where the input cable connects to) is problematic.
    Some say that adding a resistor somewhere could help.

    Maybe someone smarter than me knows where to put that resistor and what the resistance should be.

    Comment

    • perette
      Senior Member
      • Mar 2013
      • 71
      • france

      #3
      Re: iiyama e2202wsv prolite, stop after 5 sec

      hi the boss

      looking at the service manual of the adepia TGL 2020A (a clone of the iiyama) they explain that it can be the main board (folowing your recommendation).
      I've tried to test it according to it, but getting no clues on it.

      the board s a 715G2573-2.
      I got a OSD message when switching it on (different message if a cable is or not connected), but a off (and orange led) after 5 seconds.

      if putting a resistor can help to decide if it's dead or not...

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: iiyama e2202wsv prolite, stop after 5 sec

        It sounds like SAMSUNG with EEPROM problem, see if you have this EEPROM on your main (logic) board.
        https://www.badcaps.net/forum/showth...155#post246155
        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

        • perette
          Senior Member
          • Mar 2013
          • 71
          • france

          #5
          Re: iiyama e2202wsv prolite, stop after 5 sec

          Hi Budm

          I see your idea.
          Maybe yes, the same issue.
          The "main board" is a 715G2573-1.
          I've got one from a 19" screen but a version -2, and it does not work on the 22" I have.
          its behavior is the same (goes to orange led after 5 sec), but no OSD message. the short time when the screen is on shows white background and some vertical stripes. the eeprom on the board contains another code I guess made for the 19".
          But all components are the same so..

          Now on the 715G2573, the eeprom is not he same as the one you mentionned.
          So I cannot try the same solution.

          I'm still puzzled between the main board "saying" that there is no signal ans switching the power board off and a bad feedback to the system that switches it off for protection.
          Attached Files

          Comment

          • perette
            Senior Member
            • Mar 2013
            • 71
            • france

            #6
            Re: iiyama e2202wsv prolite, stop after 5 sec

            Hi everybody.

            actual status : I've changed all caps on the power supply. even if not visibly damaged.
            outcome : now I see a picture on the screen and it does not go to stand by (orange led).
            BUT the backlight turns off after 2 seconds

            As I've changed all caps (low esr ones), I've check CCFl tubes, but none is dead.

            On the back of the board to IC labelled 9945 AA7LDA seems to had some heat traces around. could this be the reason of the 2 secand to black?

            any expert adive?

            thanks.

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: iiyama e2202wsv prolite, stop after 5 sec

              Originally posted by perette

              any expert adive?

              thanks.
              Hi - read it as any expert aLive

              Figure you mean advice, not that I am an expert.

              When the picture goes black can you still make out what should be on the screen perhaps shining a flashlight on it? - Set it up with a vivid picture that you can easily recognise. and when it goes black does the standby stay green.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • perette
                Senior Member
                • Mar 2013
                • 71
                • france

                #8
                Re: iiyama e2202wsv prolite, stop after 5 sec

                Hi Selldoor

                Oups, little keyboard failure..

                Yes of course, advice is better.

                The image is visible on the screen, it's only the backlight that goes of.
                the led remain blue (not green on this one).

                To help on the heated components. here's a picture of the unit.
                Q802 and Q803 are surrounded by heat traces (both side of the board)


                thanks

                P.
                Attached Files

                Comment

                • selldoor
                  Slow Learner
                  • Dec 2010
                  • 7870

                  #9
                  Re: iiyama e2202wsv prolite, stop after 5 sec

                  They do run hot - but may be ok.
                  Have you checked the Inverter transformers Secondary Windings ( Large black Rectangles)
                  On the bottom board picture one is at the top right has six pins on one end and pins 7 and 8 on the other end. Set your multimeter on ohms 2000 and test across those pins 7 & 8 on both transformers.
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment

                  • perette
                    Senior Member
                    • Mar 2013
                    • 71
                    • france

                    #10
                    Re: iiyama e2202wsv prolite, stop after 5 sec

                    467 on one, 465 on the second one.

                    looks like it's not there.

                    P.

                    Comment

                    • selldoor
                      Slow Learner
                      • Dec 2010
                      • 7870

                      #11
                      Re: iiyama e2202wsv prolite, stop after 5 sec

                      Near q802 there is a label F801 That suggests a fuse but it is a zero resistor.
                      Can you test it - meter on ohms 200 There is another jr802 may as well test that as well
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

                      • perette
                        Senior Member
                        • Mar 2013
                        • 71
                        • france

                        #12
                        Re: iiyama e2202wsv prolite, stop after 5 sec

                        displays a zero resistance.
                        the multimeter I have is a bit short to read low resistance values.

                        PS : (if it helps) the schematic of the board can be found in my first post pages 26-27. different monitor brand, but same board.


                        P.

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870

                          #13
                          Re: iiyama e2202wsv prolite, stop after 5 sec

                          0.00 is good - same as putting the probes together?
                          I have to go out for an hour or so but will look at the scheme later.
                          Does the scheme have the part numbers of the q 802/3 you mentioned if not can you post
                          a close up picture clear enough for me to read the numbers. (I cant find anything for the number you quoted)
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment

                          • perette
                            Senior Member
                            • Mar 2013
                            • 71
                            • france

                            #14
                            Re: iiyama e2202wsv prolite, stop after 5 sec

                            hi Selldoor

                            Thanks for you help, there is no emergency.

                            I've attached schematics and a list of components.

                            I can just mention that, when I see the image and backlight is on, the backlight is not really powerfull (same as the spare CCFL I've used to test).

                            best

                            P.
                            Attached Files
                            Last edited by perette; 03-19-2013, 08:56 AM.

                            Comment

                            • selldoor
                              Slow Learner
                              • Dec 2010
                              • 7870

                              #15
                              Re: iiyama e2202wsv prolite, stop after 5 sec

                              Ok the q802/3 mosfets are AM9945N data sheet here
                              http://www.analogpowerinc.com/datash...=DS_AM9945N_F1

                              A quick test for shorts is in this guide by retiredcaps
                              https://www.badcaps.net/forum/showthread.php?t=10419 start at post 19 -power off for tests.
                              Please upload pictures using attachment function when ask for help on the repair
                              http://www.badcaps.net/forum/showthread.php?t=39740

                              Comment

                              • perette
                                Senior Member
                                • Mar 2013
                                • 71
                                • france

                                #16
                                Re: iiyama e2202wsv prolite, stop after 5 sec

                                Hello selldoor

                                I'll test it probably tomorrow.

                                thanks a lot

                                P.

                                Comment

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