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LG flatron L1718S - shaky picture when not in native resolution

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    #41
    Re: LG flatron L1718S - shaky picture when not in native resolution

    Originally posted by bocca View Post
    oIn the meantime i found one on the old motherboard but fried it while desoldering.
    I remove those SOT packages like so

    https://www.badcaps.net/forum/showpo...&postcount=139
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      #42
      Re: LG flatron L1718S - shaky picture when not in native resolution

      Very interesting! What kind of tape is that exactly? I thinh i've seen it couple of times in laptop mobos.

      One question. Is desoldering wick of any use with SMD's?

      Comment

        #43
        Re: LG flatron L1718S - shaky picture when not in native resolution

        Originally posted by bocca View Post
        Very interesting! What kind of tape is that exactly? I thinh i've seen it couple of times in laptop mobos.

        One question. Is desoldering wick of any use with SMD's?
        Looks like Kapton to me. Kitchen foil will also do the job, cover up everything you want intact.

        Desoldering wick is very useful for SMD work. I sometimes find it is easier to flood the pins of a SOT223 with solder so they are all bridged, then wick it all up so the three pins are loose, then I heat up the tab and try to lift it.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

          #44
          Re: LG flatron L1718S - shaky picture when not in native resolution

          Originally posted by tom66 View Post
          Looks like Kapton to me. Kitchen foil will also do the job, cover up everything you want intact.
          Yes, Kapton tape. It is trademark of Dupont. You can find it widely available on ebay. I got 100ft of the widest tape I could find with the thought that I can always cut it into strips.

          Aluminum foil works as well, but I don't know how to secure the foil down to the board and not have it blow away.
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            #45
            Re: LG flatron L1718S - shaky picture when not in native resolution

            bocca -

            Any update with this?

            I did a total re-cap of the PSU and logic board, but I'm still stuck witht he same symptom... backlights come on but no picture. Can't see the OSD either. It's not a white screen, just no picture.
            "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

            -Leonid Brezhnev (On the Yom Kippur War)

            Comment

              #46
              Re: LG flatron L1718S - shaky picture when not in native resolution

              Hey man.

              Nah, no update. Still waiting for the damn voltage regulator.

              Did you try those 4 cables that go to the PSU? Are they OK, power coming thru clean? If the backlight is on, then logic board is letting the power through, but signal from the video card is not being trasmitted. Maybe the buig chip itself has gone bad?

              Comment

                #47
                Re: LG flatron L1718S - shaky picture when not in native resolution

                Originally posted by mockingbird View Post
                bocca -

                Any update with this?

                I did a total re-cap of the PSU and logic board, but I'm still stuck witht he same symptom... backlights come on but no picture. Can't see the OSD either. It's not a white screen, just no picture.

                Did you test your voltage regulators?
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                  #48
                  Re: LG flatron L1718S - shaky picture when not in native resolution

                  Was the problem present before the recaping too? I mean, backilight on, no picture

                  Comment

                    #49
                    Re: LG flatron L1718S - shaky picture when not in native resolution

                    Originally posted by bocca View Post
                    Hey man.Nah, no update. Still waiting for the damn voltage regulator.
                    I bought some off that ebay site - I'll let you know when I get them then if you still need Ill post you a couple.
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                      #50
                      Re: LG flatron L1718S - shaky picture when not in native resolution

                      that would be great! I tried to order them but no one will work without paypal, even though some accepted to send to serbia.

                      One store here sent me the response that they'll make an order "but only if i take 100 or more because it too much of a hassle to order just a few for me". So I'm stuck basicly

                      Comment

                        #51
                        Re: LG flatron L1718S - shaky picture when not in native resolution

                        Did you try those 4 cables that go to the PSU?
                        Did you test your voltage regulators?
                        This is the next step...
                        Was the problem present before the recaping too? I mean, backilight on, no picture
                        Yes. Exact same problem as before...
                        "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                        -Leonid Brezhnev (On the Yom Kippur War)

                        Comment

                          #52
                          Re: LG flatron L1718S - shaky picture when not in native resolution

                          YAY!!!

                          I changed the 1.8v regulator on the logic board, fired it up and I saw the Flatron Logo, and then the PC input! Woohoo!

                          My first SMD repair!!!

                          I removed the regulators with a 60w iron if anyone is wondering. It takes a bit of finesse, but it is possible.

                          My replacement regulator came from an old Acer logic board. It's an STMicro part "LD18A", almost like this.

                          Thanks everyone for the help. There is also another good thread for this monitor here, if anyone is interested.
                          "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                          -Leonid Brezhnev (On the Yom Kippur War)

                          Comment

                            #53
                            Re: LG flatron L1718S - shaky picture when not in native resolution

                            Originally posted by bocca View Post
                            that would be great! I tried to order them but no one will work without paypal, even though some accepted to send to serbia.

                            One store here sent me the response that they'll make an order "but only if i take 100 or more because it too much of a hassle to order just a few for me". So I'm stuck basicly
                            These regulators cost 6-10 cents each in volume, so 100 could be worth it if you can get a good price...
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                              #54
                              Re: LG flatron L1718S - shaky picture when not in native resolution

                              @mockingbird: congrats man! Why oh why can't i find one to salvage?

                              @tom66: unfortunately price is not so good it goes to about 30 euros for the 100 and that's more that this monitor's worth i know it souns silly but thats the prices here. Nothing to do about is but whine at forums like these

                              OK, at least we definitely know that 1.8 reg is a bad boy so the search continues!

                              Comment

                                #55
                                Re: LG flatron L1718S - shaky picture when not in native resolution

                                @mockingbird: congrats man! Why oh why can't i find one to salvage?
                                Actually I knew I had one because I have a very similar PSU/logic (ILPI---) from an Optiquest. I didn't take it from that one partially because it would be difficult to get to with the iron... Then I found the Acer logic board and it was really easy to get to... Looking around my house I see them on all kinds of components. The thing is, there are like a million different names for this regulator. And you have to make sure to get the 1.8v version. Look on spare AGP videocards, you might find one there.

                                Free Mladic!
                                "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                                -Leonid Brezhnev (On the Yom Kippur War)

                                Comment

                                  #56
                                  Re: LG flatron L1718S - shaky picture when not in native resolution

                                  Originally posted by tom66 View Post
                                  These regulators cost 6-10 cents each in volume, so 100 could be worth it if you can get a good price...
                                  I received 10 from China for $1 + free shipping. I fixed an Acer lcd that has been sitting in my basement for about 14 months with a bad 1.8V regulator.

                                  @bocca, If you can't find one in the next few days, PM with your address. I think sending a letter to your country is only $1.80 CDN. I'll send you a couple.
                                  Last edited by retiredcaps; 06-12-2012, 06:39 PM.
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                                  We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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                                  Comment

                                    #57
                                    Re: LG flatron L1718S - shaky picture when not in native resolution

                                    That is very nice of you to offer that, retiredcaps!
                                    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

                                      #58
                                      Re: LG flatron L1718S - shaky picture when not in native resolution

                                      retiredcaps, thank you very much for your offer! If I don't find it in couple a days I'll PM you my postal address, and of course, hope to see to returning you the favour

                                      @mockingbird: you sure you're not serbian, mate?

                                      Comment

                                        #59
                                        Re: LG flatron L1718S - shaky picture when not in native resolution

                                        Originally posted by budm View Post
                                        That is very nice of you to offer that, retiredcaps!
                                        Selldoor in post #49 offered, but I already have them and I know at least one of the ten work.
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                                        Comment

                                          #60
                                          Re: LG flatron L1718S - shaky picture when not in native resolution

                                          retiredcaps, selldoor, I haven't had any luck finding there voltage regulators, so if the offer still stands...

                                          Comment

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