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    2 Viewsonic VX1940W buzzing and no signal

    The 2 Viewsonic X1940W LCD monitors I bought as a dual monitor set are both not working. They are still underwarranty but I could'nt help myself I had to take one apart. I could use some help getting the right caps ordered.
    I tried mouser and digikey but gave up. I'd prefer to just order from badcaps.net but here too I run into a roadblock with exact matches.
    I'd like to know what I can safely use to replace the following caps. Also, can anyone tell me how does one remove the epoxy glue inorder to de-solder?
    Pictures are attached.
    C1
    CapXon
    GF105
    P735 vent
    220μF 35v
    D=10mm x L=12mm x LEAD SPACE=5mm

    C302
    CapXon
    GF105
    P735 vent
    220μF 35v
    10mm x 12mm x 5mm

    C305
    CapXon
    GF 105 c
    P735 vent
    2200μF 10V
    13mm x 18mm x 5mm

    C307
    CapXon P735 vent
    KF 105c
    1000μF 10V
    8mm x 20mm x4mm

    C205
    KF105 P733
    50V 22μF
    5mm X 8MM x 3mm


    Thanks,
    Warren
    Attached Files
    Last edited by wcperki; 12-08-2010, 12:17 PM.

    #2
    Re: 2 Viewsonic VX1940W buzzing and no signal

    From what I found on the web these monitors share the same Back Light Inverter
    Power Input Board as my VIEWSONIC VX1940W model VS11868.

    Darfon b092-xx4h.b0920.001
    Westinghouse 27-D021625 Power Supply Unit
    Part Number 27-D021625
    Board Number(s) B092-XXX4H.B0920.001/D2

    TV Panel ManμFacturer Chi Mei
    Acer P191W and X193W
    VIEWSONIC VX1940W model VS11868, VP2030B, VX1962WM
    Westinghouse L1916HW
    Last edited by wcperki; 12-08-2010, 12:24 PM.

    Comment


      #3
      Re: 2 Viewsonic VX1940W buzzing and no signal

      You are going to fit in here so well!!! Under warranty and still taking them apart!!!

      Nice pics, and since you did them right (no inline) Plain Bill will be gratified as well.

      As to the glue, it just pops off most surfaces, leaving a slight residue on the board side. I use a dental tool, but a small flat head screwdriver is just fine. No need to reglue after recapping.

      As to which ones, I do see a bulge on the close ups of several, so, in general, replace all on the inverter board except the big one. It experiences lower frequency loads and usually doesn't fail. If it looks bad, however, do replace it. They can be $4 or so, which is usually the total for all the others combined.

      There was a recent post on step-by-step Digikey ordering which was really good....just can't recall who wrote it. Their site is daunting if you don't narrow it down early. I use Panasonics FM series for this application, and if you go to DIgikey, pick electrolytics, and them specify Panasonic FM. Then pick your voltage/capacitance and sizes from the now much shorter list. If the size is okay, you can always pick a higher voltage than your original, as it will slowly reform to the working voltage anyway. Don't go lower, and don't use 85 degree C caps....only the 105 degree C ones.

      Welcome aboard!

      Comment


        #4
        Re: 2 Viewsonic VX1940W buzzing and no signal

        Okay, I couldn't stand it.....here are the Digikey part #'s.....recheck the sizes as some were slightly off, but they should still fit.

        220uf/35v....... P12411-ND
        2200uf/10v.......P12357-ND
        1000/10v..........P12345-ND
        22/50v.............P12927-ND

        Have fun and keep us updated.....Be sure your soldering iron has the right heat range(s). Judging by your first post, you probablly already have this covered!

        Comment


          #5
          Re: 2 Viewsonic VX1940W buzzing and no signal

          Forgot....Digikey lists these under "aluminum" not electrolytics as I said first.

          Comment


            #6
            Re: 2 Viewsonic VX1940W buzzing and no signal

            Taking things apart has always been a facination problem is It's not always possible to get stuff working again.

            Comment


              #7
              Re: 2 Viewsonic VX1940W buzzing and no signal

              Now that's the fun part.....never giving up!

              Comment


                #8
                Re: 2 Viewsonic VX1940W buzzing and no signal

                Originally posted by romansroad View Post
                Okay, I couldn't stand it.....here are the Digikey part #'s.....recheck the sizes as some were slightly off, but they should still fit.

                220uf/35v....... P12411-ND
                2200uf/10v.......P12357-ND
                1000/10v..........P12345-ND
                22/50v.............P12927-ND

                Have fun and keep us updated.....Be sure your soldering iron has the right heat range(s). Judging by your first post, you probablly already have this covered!
                Thanks, Looks like there is a typo. P12345-ND a 6.3v should be P12354-ND a 10 v. I found the "catalogue" this time which makes it easier to look things up.
                http://onlinecatalog.digikey.com/Web...PageLabel=1648
                Does one always keep same uF spec?

                Comment


                  #9
                  Re: 2 Viewsonic VX1940W buzzing and no signal

                  Typo vs. dyslexia! Kidding!

                  The key to replacing the caps is the capacitance, so don't stray from the uf of the original. You can go up in voltage, and change sizes as the board allows.

                  Use Digikeys cheap USPS shipping option, not UPS or Fed Ex. Pretty fast shipping and low cost.

                  Comment


                    #10
                    Re: 2 Viewsonic VX1940W buzzing and no signal

                    Something interesting, when I search under Panasonic part number EEU-FM1V221
                    it returns two capicators one is a 3000hr 1.24amp 41 38 mOhm the other a 4000hr 1.29amp 38 mOhm. Which to chose 4000hr Im guessing?












                    All prices are in US dollars.
                    Image Digi-Key Part Number Manufacturer Part Number Description Series Manufacturer Capacitance Voltage Rating Tolerance Lifetime @ Temp. Operating Temperature Features Ripple Current ESR (Equivalent Series Resistance) Impedance Mounting Type Package / Case Size / Dimension Height Lead Spacing Surface Mount Land Size Packaging Quantity Available Minimum Quantity Unit Price

                    P12412-ND EEU-FM1V221L CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220uF 35V ±20% 3000 Hrs @ 105°C -40°C ~ 105°C General Purpose 1.24A - 41 mOhm Through Hole Radial, Can 0.315" Dia (8.00mm) 0.591" (15.00mm) 0.138" (3.50mm) - Bulk 13,680 1 0.50000
                    P12411-ND EEU-FM1V221 CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220uF 35V ±20% 4000 Hrs @ 105°C -40°C ~ 105°C General Purpose 1.29A - 38 mOhm Through Hole Radial, Can 0.394" Dia (10.00mm) 0.492" (12.50mm) 0.197" (5.00mm) - Bulk 54,7

                    Comment


                      #11
                      Re: 2 Viewsonic VX1940W buzzing and no signal

                      Originally posted by wcperki View Post
                      Something interesting, when I search under Panasonic part number EEU-FM1V221
                      it returns two capicators one is a 3000hr 1.24amp 41 38 mOhm the other a 4000hr 1.29amp 38 mOhm. Which to chose 4000hr Im guessing?












                      All prices are in US dollars.
                      Image Digi-Key Part Number Manufacturer Part Number Description Series Manufacturer Capacitance Voltage Rating Tolerance Lifetime @ Temp. Operating Temperature Features Ripple Current ESR (Equivalent Series Resistance) Impedance Mounting Type Package / Case Size / Dimension Height Lead Spacing Surface Mount Land Size Packaging Quantity Available Minimum Quantity Unit Price

                      P12412-ND EEU-FM1V221L CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220uF 35V ±20% 3000 Hrs @ 105°C -40°C ~ 105°C General Purpose 1.24A - 41 mOhm Through Hole Radial, Can 0.315" Dia (8.00mm) 0.591" (15.00mm) 0.138" (3.50mm) - Bulk 13,680 1 0.50000
                      P12411-ND EEU-FM1V221 CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220uF 35V ±20% 4000 Hrs @ 105°C -40°C ~ 105°C General Purpose 1.29A - 38 mOhm Through Hole Radial, Can 0.394" Dia (10.00mm) 0.492" (12.50mm) 0.197" (5.00mm) - Bulk 54,7
                      Choose based on dimensions (form factor). Some Panasonic caps are available in standard (no suffix), short (S suffix) and tall (L suffix). Note: you profile doesn't indicate where you are. Digikey is very good if you are in the USA; not so good if you live outside North America.

                      PlainBill
                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                      Comment


                        #12
                        Re: 2 Viewsonic VX1940W buzzing and no signal

                        Ok, attached is my parts list. I ordered one extra set for a friend who also has the same monitor
                        Attached Files

                        Comment


                          #13
                          Re: 2 Viewsonic VX1940W buzzing and no signal

                          Very true on the USA aspect....missed that. I always wondered about the form factor codes.....thanks!

                          Comment


                            #14
                            Re: 2 Viewsonic VX1940W buzzing and no signal

                            Less than $10 for each monitor and you should be back in business in no time.....NICE!

                            Comment


                              #15
                              Re: 2 Viewsonic VX1940W buzzing and no signal

                              Originally posted by romansroad View Post
                              Less than $10 for each monitor and you should be back in business in no time.....NICE!
                              That was $11.29 total enough for 3 monitors so cost w/ tax + shipping is really only $3.77 for each monitor. I placed the order around noon and got confirmation it had shipped at 1:30 via U.S. Postal Service First Class Mail as you suggested. I expect to have parts by Friday or Saturday. Not bad, to me it's less hassel than finding shipping boxs, getting what is it a RMA, and shipping 2 monitors back for warranty work. Only question is what Viewsonic would have replaced or repaired my units.

                              Comment


                                #16
                                Re: 2 Viewsonic VX1940W buzzing and no signal

                                Usually when a monitor is replaced under warranty the replacement is a refurbished unit. Often it's not even the same model monitor. That wouldn't be too bad if your 17" monitor was replaced with a 21" wide screen, but it doesn't usually happen that way.

                                PlainBill
                                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                Comment


                                  #17
                                  Re: 2 Viewsonic VX1940W buzzing and no signal

                                  Originally posted by PlainBill View Post
                                  Usually when a monitor is replaced under warranty the replacement is a refurbished unit. Often it's not even the same model monitor. That wouldn't be too bad if your 17" monitor was replaced with a 21" wide screen, but it doesn't usually happen that way.

                                  PlainBill
                                  you're right. ...but, then

                                  A while back, my ViewSonic VX922 was giving me fits... it'd take more and more "power on" cycles for it to actually come on. Eventually, it wouldn't come on at all. At that time, I had owned the monitor for 2 years and 360 days (that's right, 5 days shy of the 3-year warranty period). I guess I was feeling lazy, and I had a [borrowed] monitor to use in the interim, so I got the RMA and sent it off to ViewSonic. Two weeks later, they replaced it with a brand new (manufacture date was just a tad over a month prior to when it showed up on my doorstep!) ViewSonic VX1940w.

                                  For those keeping score at home, they replaced my (almost) 3-year old, 4 ms 19" 4:3 ratio monitor with a brand new 2 ms 19" 16:10 monitor, under warranty.

                                  ...which brings me here, today.

                                  I've had this monitor (VX1940w) now since August 2008. Under the terms of their warranty, it (despite being brand new) only came with a 5-day warranty (the unit sent inherits the remainder of the originally-purchased monitor's warranty). The day before yesterday, the screen went black. Subsequent attempts to power it on resulted in a very dim display, accompanied with the audible oscillation noted earlier in this thread, for 10-15 seconds, then back to black. ...a classic symptom of the "bad capacitors in the inverter" problem noted here.

                                  As much as I'd like to find an excuse to buy a new 22" or 24" widescreen monitor to replace it, my bank account would be significantly happier spending $5.00 or so to fix this monitor than to spend a couple hundred $ buying a new monitor. ...so, I guess I'm off to purchase a few caps, locate a clean butter knife from the kitchen, and get cozy with my desoldering and soldering stations for a few minutes.

                                  Thanks for this forum, and for allowing me to become a part of it. I hope that I can learn a few new tricks here while simultaneously sharing some of my acquired wisdom/knowledge to others.

                                  Comment


                                    #18
                                    Re: 2 Viewsonic VX1940W buzzing and no signal

                                    okay, so a few hours later, and I've torn apart my VX1940w, and pulled out the power board. pic attached.

                                    two caps are clearly in need of replacement (220 uF 35V)

                                    I'm not sure about the other -- there's no bulging on the end, but the splitting of the plastic covering has me a bit concerned. should I just go ahead and order up a 120 uF 400V cap as well, and install it while I have everything apart?
                                    Attached Files

                                    Comment


                                      #19
                                      Re: 2 Viewsonic VX1940W buzzing and no signal

                                      Originally posted by briand View Post
                                      okay, so a few hours later, and I've torn apart my VX1940w, and pulled out the power board. pic attached.

                                      two caps are clearly in need of replacement (220 uF 35V)

                                      I'm not sure about the other -- there's no bulging on the end, but the splitting of the plastic covering has me a bit concerned. should I just go ahead and order up a 120 uF 400V cap as well, and install it while I have everything apart?
                                      Yes, go ahead and replace it. It won't be that much more money. Definitely replace the other 3 small caps that aren't swollen. It's only a matter of time before they also fail.

                                      Comment


                                        #20
                                        Re: 2 Viewsonic VX1940W buzzing and no signal

                                        Originally posted by briand View Post
                                        should I just go ahead and order up a 120 uF 400V cap as well, and install it while I have everything apart?
                                        It doesn't look too healthy in that picture with the plastic sleeve warped near the bottom. I would replace it. Capxon doesn't have the greatest respect on this forum.
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