LG flatron L1718S - shaky picture when not in native resolution

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  • bocca
    Senior Member
    • Mar 2012
    • 107
    • Serbia

    #21
    Re: LG flatron L1718S - shaky picture when not in native resolution

    I found them. There's two of 'em, both 22uf 25v. As far as I can see no ESR stated on them. Only other marking except temp rating (105) is 0627(M). Guess that's model.

    @tom66:
    Don't have the datasheet. Sore i found them in is small. They don't even have the website. I'll go there tomorrow to try to find the right ones. Sadly, any kind of online shopping is a thing of imagination here, so there's 4-5 stores to buy from and that's it.

    @retiredcaps:
    Found the battery of one cell phone which give 4.12v constantly (good battery, smashed phone) so i tried with it but it's fat too complicated to connect to board. I'll think of some other way

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: LG flatron L1718S - shaky picture when not in native resolution

      You're lucky to even have electronic parts shops, in the UK the only one left is Maplin and they only seem to sell disco lights and car stereos!

      If you record the series on the capacitor (something like two to three characters) then the ESR can be looked up.
      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

      • mockingbird
        Badcaps Legend
        • Dec 2008
        • 5484
        • -

        #23
        Re: LG flatron L1718S - shaky picture when not in native resolution

        Originally posted by bocca
        @mockingbird:
        That would be great, mate! I appriciate it
        Hello to you in Serbia. Long live Serbia!

        I just want to say that whoever designed this one was a masochist. I've taken apart LG screens before, with this one, I couldn't figure it out until finally I found the service manual and this important picture:



        Ok firstly, the PSU:



        Circled are the two groups of pi filters. We can do a little better spec-wise and matching the ESR:
        1) 25V 1000uF 13x21mm - Replacement
        2) 25V 470uF 10x16mm - Replacement
        3) 35V 150uF 8x12mm - Replacement

        1) 10V 1000uF 10x16mm - Replacement
        2) 10V 1000uF 10x16mm - Replacement
        3) 35V 150uF 8x12mm - Replacement

        For the 25V 47uF caps, you can use anything, but it's best to use a
        high quality cap
        (Don't forget to get 4 of these).

        For the logic board, here are the caps:
        1 x 16V 220uF 6.3x11mm
        2 x 25V 10uF 5x11mm
        2 x 16V 100uF 5x11mm
        5 x 16V 22uF 5x11mm

        Good luck.

        Comment

        • bocca
          Senior Member
          • Mar 2012
          • 107
          • Serbia

          #24
          Re: LG flatron L1718S - shaky picture when not in native resolution

          hahaha, you seem to love Serbia more than I do

          Errr, yeah, about that stand. I never found that service manual, but did exactly the same thing as illustrated. My motive was "I'm either gonna take off this damn stand, or I'm gonna break the mother***ker, it's all the same at this point", having tried for about 2 hours

          Thank you very much for the schematic. Tomorrow I'm getting two of the 22uf, 16v and I'll see if that fixes the problem

          Comment

          • Scenic
            o.O
            • Sep 2007
            • 2642
            • Germany

            #25
            Re: LG flatron L1718S - shaky picture when not in native resolution

            Originally posted by tom66
            In this application, Yageo may be okay. They are formerly Philips/Vishay caps so better than no-name junk.
            Yageo = Teapo
            The only thing that's different is the name. Even the series are identical.

            For example:
            Yageo SC PDF -> link
            Teapo SC PDF -> link1 link2 (2 somewhat different versions of the same datasheet)

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271

              #26
              Re: LG flatron L1718S - shaky picture when not in native resolution

              Originally posted by tom66
              The datasheet doesn't mention a maximum input - I know some regulators are limited to just 6V in! - so try and stay within this limit.
              Yes, I caught my own error after posting in post #15

              Most of the time, I use *weak* 9V batteries. The one in the picture is 7.3V with no load. I find it easier to clip on leads versus doing multiple AA cells in series.

              The voltage regualtor in the picture, obviously, is a fixed 3.3V. I do have a 1.8V, but the 3.3V is the one I had handy. Cloudy day so I had to use indoor flash so not my best work.
              Attached Files
              Last edited by retiredcaps; 06-06-2012, 05:49 PM.
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              Comment

              • bocca
                Senior Member
                • Mar 2012
                • 107
                • Serbia

                #27
                Re: LG flatron L1718S - shaky picture when not in native resolution

                OK, i think i measured 102. It peaks to 1.60v for a brief moment and then drops to 0. Battery is stable 4v

                Comment

                • bocca
                  Senior Member
                  • Mar 2012
                  • 107
                  • Serbia

                  #28
                  Re: LG flatron L1718S - shaky picture when not in native resolution

                  I changed two caps we were talking about and no change noted... Sadly I can;t seem to find this particular IC, that has output voltage of 1.8v. Closest is 3.3v.

                  Aly alternatives?

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #29
                    Re: LG flatron L1718S - shaky picture when not in native resolution

                    Originally posted by bocca
                    I changed two caps we were talking about and no change noted... Sadly I can;t seem to find this particular IC, that has output voltage of 1.8v. Closest is 3.3v.

                    Aly alternatives?
                    Look for AS1117, or LM1117, or LD1117, or AM1117. -18 is the output. Can eBay sellers ship to you? If so, http://www.ebay.co.uk/itm/2-x-SMD-SM...item3f06fd6467 or http://www.ebay.co.uk/itm/20x-AMS111...d#ht_779wt_956 (pack of 20, you'll be able to fix 19 more monitors. )

                    If not, you could do what I did to fix this 32" TV; I built a little regulator board (with an LM317T, cheap and plentiful device) and fitted it in the chassis. However, that TV had a lot of spare space inside; I'm not sure a 17" LCD would have enough space.
                    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

                    • selldoor
                      Slow Learner
                      • Dec 2010
                      • 7870

                      #30
                      Re: LG flatron L1718S - shaky picture when not in native resolution

                      Or if you just want ten and are lucky with bid and can wait for it
                      http://www.ebay.co.uk/itm/10pcs-AMS1...a7553eb8f#shId

                      Although he is new so low feedback - might even bid myself for 99cents?
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

                      • bocca
                        Senior Member
                        • Mar 2012
                        • 107
                        • Serbia

                        #31
                        Re: LG flatron L1718S - shaky picture when not in native resolution

                        They probably can ship but i have no ways of paying for it as serbia is not in Paypal, sadly.

                        Tell me, would the variable voltage ones do?? I can find some that have var output from 1.5v up until 30 or something

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870

                          #32
                          Re: LG flatron L1718S - shaky picture when not in native resolution

                          Do you have one where you can read the part number - we can then get a data sheet and see if/how.
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment

                          • bocca
                            Senior Member
                            • Mar 2012
                            • 107
                            • Serbia

                            #33
                            Re: LG flatron L1718S - shaky picture when not in native resolution

                            Here's the store page. you'll find pdf link

                            http://www.mikroprinc.com/proizvodi/...217t/index.php

                            here's the direct link for the dfatasheet, i hope it works. if not you can download it from the webpage above

                            http://www.mikroprinc.com/index.php?...emart&Itemid=8

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #34
                              Re: LG flatron L1718S - shaky picture when not in native resolution

                              You can build a little circuit on a bit of prototyping board or stripboard to do it with the LM317T.

                              Use input capacitor 100uF or above (any cap with good voltage rating is okay here.)

                              Use output capacitor 100uF or above (again any cap is fine, as long as voltage is okay.)

                              From the output pin tie a 220 ohm resistor to the adjust pin.

                              Then the adjust pin gets a resistor of value 470 ohms, this will give 1.836V, with a 5% tolerance, which is fine.

                              Optionally add a red LED on the output, with a 10 ohm resistor, to indicate output is active. (Most red LED will be fine with 1.8V.)

                              Tie the input to a 5V source.

                              I would recommend adding a heatsink to the LM317T too, and applying epoxy or hot glue to hold big components down. Insulate the bottom of the board with electrical tape and find a good place to put it inside the monitor.
                              Last edited by tom66; 06-07-2012, 10:58 AM.
                              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

                              • bocca
                                Senior Member
                                • Mar 2012
                                • 107
                                • Serbia

                                #35
                                Re: LG flatron L1718S - shaky picture when not in native resolution

                                thanks tom. I'll get to it right now!

                                Comment

                                • retiredcaps
                                  Badcaps Legend
                                  • Apr 2010
                                  • 9271

                                  #36
                                  Re: LG flatron L1718S - shaky picture when not in native resolution

                                  Originally posted by bocca
                                  Sadly I can;t seem to find this particular IC, that has output voltage of 1.8v. Closest is 3.3v.

                                  Aly alternatives?
                                  Check your junk or dead boards. The 1.8V regulator is a fairly common part. For example, I found one on my old sound card.
                                  --- begin sig file ---

                                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                  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.

                                  Please do not post inline and offsite as they slow down the loading of pages.

                                  --- end sig file ---

                                  Comment

                                  • bocca
                                    Senior Member
                                    • Mar 2012
                                    • 107
                                    • Serbia

                                    #37
                                    Re: LG flatron L1718S - shaky picture when not in native resolution

                                    I may be having some combination to get it but i'll surely check old components. There's lots in my office!

                                    Thanks

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #38
                                      Re: LG flatron L1718S - shaky picture when not in native resolution

                                      Originally posted by bocca
                                      thanks tom. I'll get to it right now!
                                      Remember to check your board before you wire it in with a voltmeter. Echoing Retiredcaps though, I have found old laptop and computer motherboards to be a goldmine for replacement regulators.
                                      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

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: LG flatron L1718S - shaky picture when not in native resolution

                                        Just a correction to my previous post - realised I was being an idiot - use a 330 ohm resistor instead of 470 ohm in the lower resistor. This will give 1.87V. Even better use a little potentiometer of 500 ohms in place of the 330 ohm resistor so you can adjust the output.

                                        My previous suggestion would have given 2.65V!! I was using the wrong formula. The correct formula is 1.25 * (1 + Rlower/Rupper)
                                        Last edited by tom66; 06-08-2012, 07:46 PM.
                                        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

                                        • bocca
                                          Senior Member
                                          • Mar 2012
                                          • 107
                                          • Serbia

                                          #40
                                          Re: LG flatron L1718S - shaky picture when not in native resolution

                                          oh, OK. Thanks. I bought everything for the circuit but still waiting on one store to send me response about the IC. In the meantime i found one on the old motherboard but fried it while desoldering. At least I learnt from the mistake so I'm looking for another one. Most are 3.3v

                                          Comment

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