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    #1

    Viewsonic VE710b

    Didn't see any of these here so I figured I'd post one i'm starting on. It had an intermittent start and fading problem that could sometimes be fixed by smacking it around a little. One other issue was every couple minutes the menu would pop up for some reason. Well i pulled it apart and found 3 burst caps and 2 bulging ones. Hope to be able to replace them this weekend when caps get here to see if replacing all caps works.

    *Disclaimer* I am in no way and expert or have a clue what i'm doing other being able to solder.

    Sorry for poor quality pic. I'm not a photographer and using an old fuji A200.
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    #2
    Re: Viewsonic VE710b

    Hi the issue with the menu popping up may be down to the switches
    i have had samsungs do this because the little board had warped and the legs earthed out on the screen surround .
    Worth checking once you have it working again

    Comment

      #3
      Re: Viewsonic VE710b

      Not going to say it's not possible but the switches sit below the screen and the frame behind it has reliefs large enough to easily clear all pins on the back of the switch pcb. I'll definitely look for that when reassembling.
      I don't know if that is something that voltage fluctuations(?) would trigger. My limited understanding of caps comes from car stereo though where it's used as a fast dumping battery so i could be wrong. Come to think of it they seem to work for blocking frequencies in audio applications also.
      I definatly have alot more reading and memorizing to do.
      Last edited by junktv; 11-10-2010, 05:18 PM.

      Comment

        #4
        Re: Viewsonic VE710b

        Well the smacking part, from what little experience I have, usually means a loose connection somewhere. This could be a solder joint or loose wire in a harness. Check the underside of the board for bad solder joints and give components a wiggle to check if they are loose.

        Comment

          #5
          Re: Viewsonic VE710b

          They all look good as far as i can tell. No rings, multi tone or anything that i can see. I can't say the same for the benq board up next but that's another topic and not real worried.
          There at the end it was a good 10+ minutes of beating the snot out of it before i gave up and added it to the broke shelf. I'm not sure how these caps are made either could anything be jostled inside them? I know a trick with alkaline batteries is to drop them on the floor a few times on their side and they seem to last a little longer in a pinch. The construction i'm sure is completely different from batteries i'd say though.
          Last edited by junktv; 11-10-2010, 05:55 PM.

          Comment

            #6
            Re: Viewsonic VE710b

            Caps are a bit different than a battery in construction, you are correct. I do not think that anything could be knocked loose inside a properly functioning capacitor. However, I cannot say the same for a capacitor that is filling with gas ( the bulging effect). Considering the mess of those caps I wouldn't be surprised if replacing them will fix the problems.

            Comment

              #7
              Re: Viewsonic VE710b

              I'm about to recap a VE710b I've had here for a while which the parts for just arrived today. Revision Number is 3.01 and date is "03.01 2004". Here are the Newark part numbers I ordered keeping Physical Dimensions, ESR, and ripple in mind:

              Location - Rating / Series - Newark PN
              C903 - 16V 470uF EB - 96K4136, 04M9020
              C910 - 16V 470uF EB - 96K4136, 04M9020
              C901 - 50V 22uF PF - 25M9187
              C906 - 50V 22uF PF - 25M9187
              C828 - 10V 1500uF EB - 74R3417
              C824 - 10V 1500uF EB - 74R3417
              C825 - 10V 1000uF EB - 04M9010
              C822 - 16V 1500uF EB - 74R3417
              C823 - 16V 1500uF EB - 74R3417
              C810 - 35V 100uF PF - 65R3675
              C809 - 50V 22uF PF - 25M9187
              C827 - 50V 1uF - PF - 38M6843
              F801 - 250V 2.5A (FUSE) - 42K9311

              I will let you know how it goes.
              "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

                #8
                Re: Viewsonic VE710b

                Originally posted by Funkhauser View Post
                Caps are a bit different than a battery in construction, you are correct. I do not think that anything could be knocked loose inside a properly functioning capacitor. However, I cannot say the same for a capacitor that is filling with gas ( the bulging effect). Considering the mess of those caps I wouldn't be surprised if replacing them will fix the problems.
                If it doesn't then i'm where i started minus a few bucks. If it does it helps the next guy.

                Originally posted by mockingbird View Post
                I'm about to recap a VE710b I've had here for a while which the parts for just arrived today. Revision Number is 3.01 and date is "03.01 2004". Here are the Newark part numbers I ordered keeping Physical Dimensions, ESR, and ripple in mind:

                Location - Rating / Series - Newark PN
                C903 - 16V 470uF EB - 96K4136, 04M9020
                C910 - 16V 470uF EB - 96K4136, 04M9020
                C901 - 50V 22uF PF - 25M9187
                C906 - 50V 22uF PF - 25M9187
                C828 - 10V 1500uF EB - 74R3417
                C824 - 10V 1500uF EB - 74R3417
                C825 - 10V 1000uF EB - 04M9010
                C822 - 16V 1500uF EB - 74R3417
                C823 - 16V 1500uF EB - 74R3417
                C810 - 35V 100uF PF - 65R3675
                C809 - 50V 22uF PF - 25M9187
                C827 - 50V 1uF - PF - 38M6843
                F801 - 250V 2.5A (FUSE) - 42K9311

                I will let you know how it goes.
                Mine is July 05 on case and board is ver 1.00 date 205.05.10

                Hoping friday or saturday they should be in.
                I need to see if radio shack or another local shop has a solder sucker before then. My past methods have been rather crude.

                Please do and best of luck.

                Comment

                  #9
                  Re: Viewsonic VE710b

                  You don't need solder wick or solder sucker. I just finished recapping it I'm about to reconnect it. I've had it lying here so long I have to remember where I put the screws for the chassis. Indeed my board is different from yours. I'll try to post a pic of it sometime.

                  Regarding the soldering. You can do it very cleanly with rather crude instruments. I use some generic plumbing solder and some rosin core solder I found lying around. First unsolder the cap by heating one side and then rocking the cap from the underneath with your finger. Repeat this to the other side undtil it comes clean off the board. If it doesn't budge, make sure it's not the epoxy or the silicone holding it in place.

                  Don't bother putting solder on the pad from above. I have a much better way. There should be some room for the leads to go in from above. Cut the capacitor leads to the desired size, put the capacitor in the holes (Don't push them in by force or you will lift the solder trace in which case you will have to bridge with a wire to a nearby point), while holding it in place with your finger, flip the board upside down and heat the solder on both sides like you did in a rocking motion before: Heat one side, rock it in a little, then heat the other side.

                  Once you have it in, if it's stable then you can proceed to solder it in completely. If not, then bend the legs away from eachother to stabilize it while you solder. Now flip the board with the lead side facing you, and hold the cap underneath with your finger. Apply some flux to the joint, and then apply solder. While you're soldering push from underneath to make sure it is as low as it can go.

                  I always do this and my joints are impetuous, I would take a picture if I had a camera nearby. This is essential with motherboards where the lead holes are tiny.
                  "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

                    #10
                    Re: Viewsonic VE710b

                    An even easier method involves mounting a steel needle slightly larger that the diameter of the leads into a wooden handle. My version is a 1966 dissecting pick. Use the method Mockingbird suggests to remove the old cap, then remelt the solder and quickly push the needle into the hole. This forces the solder out.

                    The advantage is you can insert the caps and verify they are oriented properly before soldering them in place.

                    While I'm all in favor of saving money, using plumbing solder and flux seems a tad extreme.

                    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

                      #11
                      Re: Viewsonic VE710b

                      The solder isn't plumbing solder, just the flux. The solder came with the "Cold Heat" device and is meant for electronics or jewlery. Probably 60/40 or better.
                      "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

                        #12
                        Re: Viewsonic VE710b

                        The rocking is how i did my tv. Then used some speaker wire to pull the rest off. The last board i did was a main relay board for an acura that had known dry joints and was evident by looking at it. I rigged up a shop vac with some really small arrow shaft cut offs i had laying around over the years and it worked like a charm but loud. Plus i only have a popular mechanics 30watt iron so the breeze doesn't help. It's been a champ for the past 16 years though as long as the job is small. I need to upgrade and tools are an investment in my mind although radio shack i would see as a toss away since i'm sure there is better quality out there. The reviews didn't seem to good either but haven't been to the store or the other shop to see what's in stock.

                        I do need to get some more solder soon. I have many spools of old thick solder but only use it for sweating copper and auto battery terminals. The stuff i have been using is thin and i'm thinking has a bit of silver. My memory is horrible but purchased it when i was into rc so it was for making packs(using hotter iron) and deans plugs. For some reason 80%/20% or 85/15 is sounding right.

                        You guys responded while i went out to look for the paper that came in the little spiral tube but couldn't find it. But ya i don't think plumbing solder is hard enough or something for electrical work. Am i thinking correctly though? All i seem to find is rohs and different tin/lead blends.
                        Last edited by junktv; 11-10-2010, 09:48 PM.

                        Comment

                          #13
                          Re: Viewsonic VE710b

                          The recap was a success. The caps were mostly Panasonic and one or two Rubycons for the teeny tiny caps. Boy did Viewsonic make these things touugh to open. Some idiot there decided to screw in AND rivet the stand, rendering it undetacheable.

                          By the way, did you also have a "Chunghwa" panel like me? Never heard of them. Sigh. I miss my CRT. But that thing had to go, it has no red.
                          "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

                            #14
                            Re: Viewsonic VE710b

                            Originally posted by mockingbird View Post
                            The recap was a success. The caps were mostly Panasonic and one or two Rubycons for the teeny tiny caps. Boy did Viewsonic make these things touugh to open. Some idiot there decided to screw in AND rivet the stand, rendering it undetacheable.

                            By the way, did you also have a "Chunghwa" panel like me? Never heard of them. Sigh. I miss my CRT. But that thing had to go, it has no red.
                            Great news and glad it worked for you.

                            I'm trying to think if i needed to remove it or not. i'm thinking it was a squeeze getting it out of the rear case since the vga cable was hard wired.
                            Yup same brand panel.

                            Comment

                              #15
                              Re: Viewsonic VE710b

                              It is somewhat difficult to reattach everything if you don't, but I don't see how you can. If you take off the pads on the bottom (warning: They will not stick back on afterwards), then you'll see 5 screws. The thing is, there are also rivets there.

                              I managed to do it without taking the stand off. Took several tries and a lot of patience. If you put everything back together and then turn it on and then only see white on the screen, it means the main LCD ribbon cables came out. Good luck!
                              "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

                                #16
                                Re: Viewsonic VE710b

                                Hey mockingbird, any chance you were smarter than me and took pics showing the orientation of the 2 pink/white and 2 blue/black plugged wires that come from the pannel? I feel like a idiot for not making note of that.

                                Comment

                                  #17
                                  Re: Viewsonic VE710b

                                  Doh! I'm typing looking at the screen right now, so I'd have to open her up and check for you. Give me a few minutes.
                                  "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

                                    #18
                                    Re: Viewsonic VE710b

                                    I've re-capped one of these - stupid LTEC.
                                    The base will rotate 90˚ to fold flat against the upright support.

                                    Comment

                                      #19
                                      Re: Viewsonic VE710b

                                      Bad thing is i even had a blue marker there to make note.

                                      Comment

                                        #20
                                        Re: Viewsonic VE710b

                                        As long as you have a blue & pink pair of plugs on each pair of sockets, I'm not sure it matters whether you have them in either socket, e.g blue left, pink right or pink left, blue right.

                                        Usually the individual plugs will only fit in one way up.

                                        Comment

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