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Dead Power Supply(XAD819AR) for Acer AL1706

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    #1

    Dead Power Supply(XAD819AR) for Acer AL1706

    When testing this monitor with the dead board I receive no power what so ever, not even the power LED. If I switch out this board with a stock, working board, of the same model, the rest of the monitor works fine, I have replaced 9 caps. All of the ones listed in the picture except for the 4.7µf. Any suggestions as to what the problem might be?

    Caps were replaced with,

    1000µF 35V 20% Radial-lead Electrolytic Capacitor Operating temperature: --40 to +85°C - X2

    470µF 35V 20% Radial-lead Electrolytic Capacitor Operating temperature: --40 to +85°C - X2

    220µF 35V 20% Radial-lead Electrolytic Capacitor Operating temperature: --40 to +85°C - X2

    100µF 35V 20% Radial-lead Electrolytic Capacitor Operating temperature: --40 to +85°C - X3

    Tags: None
    #2
    Re: Dead Power Supply(XAD819AR) for Acer AL1706

    I see several possibilities.

    1. Don't use CapXon's - they're unreliable.

    2. Don't use caps rated for 85°C, use low ESR 105°C caps. I prefer Panasonic FC or FW.

    3. I question using caps with radically higher voltage ratings, this makes fitting caps into tight quarters more difficult.

    4. Have you checked the input fuse?

    5. On some power supplies the small caps (like the 4.7 µF 50 volt) cause problems. They are essential for the regulator chip.

    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

      #3
      Re: Dead Power Supply(XAD819AR) for Acer AL1706

      See attached pic.

      Toast
      Attached Files
      veritas odium parit

      Comment

        #4
        Re: Dead Power Supply(XAD819AR) for Acer AL1706

        Originally posted by PlainBill
        I see several possibilities.

        1. Don't use CapXon's - they're unreliable.

        2. Don't use caps rated for 85°C, use low ESR 105°C caps. I prefer Panasonic FC or FW.

        3. I question using caps with radically higher voltage ratings, this makes fitting caps into tight quarters more difficult.

        4. Have you checked the input fuse?

        5. On some power supplies the small caps (like the 4.7 µF 50 volt) cause problems. They are essential for the regulator chip.

        PlainBill
        1. The originals were CapXon and they were all replaced with RadioShack brand.

        2. I don't think RadioShack has any caps rated for 105°C. Would using the lower rated caps cause the problem?

        3. I also can only find RadioShack caps in 35v for these µf ratings. Would using the higher voltage cause the problem?

        4. I have not checked the input fuse as I am fairly new to all this. Where is the specific fuse located and what shall I look for/use to check it, or test it?

        5. RadioShacks 4.7µf capacitors are rated at 35v. Would this change pose a problem if it took the place of the 4.7µf 50v CapXon one?

        Thankyou for all the suggestions, any help at all is greatly appreciated.

        Comment

          #5
          Re: Dead Power Supply(XAD819AR) for Acer AL1706

          Originally posted by Toasty
          See attached pic.

          Toast
          I am not familiar with checking fuses on power supply boards, what am I looking for when checking these fuses? Do you know the rating on the cap you suggested I change? What is the reason you are suggesting replacing this cap? The last question is just so I can learn. I will post some pictures of the board in roughly 15min.

          Comment

            #6
            Re: Dead Power Supply(XAD819AR) for Acer AL1706

            Triple post, oh man. I don't see an edit button though. Here is an image of the board.
            Attached Files

            Comment

              #7
              Re: Dead Power Supply(XAD819AR) for Acer AL1706

              Originally posted by IRShifty
              1. The originals were CapXon and they were all replaced with RadioShack brand.
              That's like replacing old junk with new junk.

              Originally posted by IRShifty
              2. I don't think RadioShack has any caps rated for 105°C. Would using the lower rated caps cause the problem?
              So don't use Radio Shack parts. The FAQ has information on GOOD brands. Link to thread.

              Originally posted by IRShifty
              3. I also can only find RadioShack caps in 35v for these µf ratings. Would using the higher voltage cause the problem?
              Again, don't use Radio shack. The FAQ also has information on reliable distributors. For example, the caps you need would cost $.50 - $1.00 each from Digikey; shipping would be about $2.00

              Originally posted by IRShifty
              4. I have not checked the input fuse as I am fairly new to all this. Where is the specific fuse located and what shall I look for/use to check it, or test it?
              See Toasty's excellent post. Use a VOM. If you don't have one, a VERY cheap one is available from Harbor Freight Tools for under $3.00

              Originally posted by IRShifty
              5. RadioShacks 4.7µf capacitors are rated at 35v. Would this change pose a problem if it took the place of the 4.7µf 50v CapXon one?
              See response to point 3 above.

              Originally posted by IRShifty
              Thankyou for all the suggestions, any help at all is greatly appreciated.
              You're welcome. And Welcome to Badcaps Forums.

              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

                #8
                Re: Dead Power Supply(XAD819AR) for Acer AL1706

                I have repaired other boards using RadioShack brand, but don't get me wrong, I do understand your point of purchasing elsewhere. I was only trying to avoid waiting times that go along with ordering online.

                Comment

                  #9
                  Re: Dead Power Supply(XAD819AR) for Acer AL1706

                  You're looking for continuity through the fuse(s). No resistance - zero ohms. Most likely one is blown, that is why no indicator light.

                  >>Do you know the rating on the cap you suggested I change?<<
                  No. My psychic abilities can only do so much. Perhaps reading the cap markings would help...?

                  >>What is the reason you are suggesting replacing this cap? The last question is just so I can learn.<<
                  The reason for replacing the cap is that all the others where replaced, why not do this one too. Think of it as having a 6 cylinder engine in your car and only changing 5 of the spark plugs on a tune-up. Why does it run rough...?

                  >>RadioShacks 4.7µf capacitors are rated at 35v. Would this change pose a problem if it took the place of the 4.7µf 50v CapXon one?<<
                  You can NOT replace a higher voltage cap with a lower voltage cap except in very few instances. You CAN replace a lower voltage cap with a higher voltage cap in most instances.

                  Toast
                  veritas odium parit

                  Comment

                    #10
                    Re: Dead Power Supply(XAD819AR) for Acer AL1706

                    And others have said, the reason with radio shack capacitors they are rejects or unused capacitors sold from manufacters. And lot of these caps don't have good specifications.

                    Cheers, Wizard

                    Comment

                      #11
                      Re: Dead Power Supply(XAD819AR) for Acer AL1706

                      Originally posted by IRShifty
                      I have repaired other boards using RadioShack brand, but don't get me wrong, I do understand your point of purchasing elsewhere. I was only trying to avoid waiting times that go along with ordering online.
                      The waiting time is minimal. DigiKey will ship small packages first class mail and priority mail. If you place an order Monday evening it will ship Tuesday and be delivered Thursday or Friday. The speed advantage of buying from Radio Shack must be weighed against getting quality parts with the correct ratings.

                      The reason for replacing the 4.7 µF cap was simple. That cap is responsible for storing the energy the voltage regulator requires to start. If it is bad the power supply won't start. I got burned on that one myself. I replaced EVERY cap except that one in a Gateway monitor. And it still wouldn't work until I replaced that cap. Others have had the same problem. This week I repaired an Acer monitor which used the same voltage regulator as the Gateway. And you can bet that I replaced that cap, even though the power supply was working.

                      To mimic the Mastercard commercial:

                      Cost of Replacement parts: $12.00
                      Shipping: $6.00
                      Time to disassemble monitor, troubleshoot, repair, and reassemble: 1 Hour

                      KNOWING you aren't going to have to open the monitor up again: Priceless.

                      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: Dead Power Supply(XAD819AR) for Acer AL1706

                        There is nothing wrong with Radio Shack capacitors except that they aren't rated for this kind of application.

                        Rack Shack carries Xicon 85C caps for the most which are a good brand but they are General Purpose caps.

                        - Low ESR and high Ripple ratings are required here.

                        General Purpose caps aren't going to live very long and just might take some other parts out with them when they go.

                        I don't see how having to fix it again later is a savings in time.
                        .
                        Last edited by PCBONEZ; 05-03-2009, 03:37 AM.
                        Mann-Made Global Warming.
                        - We should be more concerned about the Intellectual Climate.
                        -
                        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
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                        Comment

                          #13
                          Re: Dead Power Supply(XAD819AR) for Acer AL1706

                          I agree with the message about rat shack caps... I bought a large number of them from a liquidation place here when they went to "The Source" in Canada. Testing them with an ESR meter, over half were no good.

                          Comment

                            #14
                            Re: Dead Power Supply(XAD819AR) for Acer AL1706

                            I am waiting on getting a VOM for checking the fuses, either later today or tomorrow. I don't know if I can get the rest of the caps I need locally. I don't have a problem ordering them online. Except for the fact I don't know a lot about them and the order form is pretty complicated coming from my view. Can someone tell me how to properly fill out the inventory form on digikey to get what I need to purchase here.

                            PS. The black/silver cap that I was told to replace as well is a 47µf 50v. The only reason I asked if you knew was because its a bitch to see without removing it.
                            Last edited by IRShifty; 05-03-2009, 11:48 AM.

                            Comment

                              #15
                              Re: Dead Power Supply(XAD819AR) for Acer AL1706

                              Originally posted by IRShifty
                              I am waiting on getting a VOM for checking the fuses, either later today or tomorrow. I don't know if I can get the rest of the caps I need locally. I don't have a problem ordering them online. Except for the fact I don't know a lot about them and the order form is pretty complicated coming from my view. Can someone tell me how to properly fill out the inventory form on digikey to get what I need to purchase here.

                              PS. The black/silver cap that I was told to replace as well is a 47µf 50v. The only reason I asked if you knew was because its a bitch to see without removing it.
                              That confirms it. That's the $@%#^#! that drove me nuts for a week!!
                              Using DigiKey CAN be daunting. This works for me; others will have ways that work better for them.

                              From the DidiKey home page, click on 'Go' next to the Search box. This takes you to a list of categories. Scroll down to Capacitors, then click on Electrolytic - Aluminum. On the filters page select the Capacitance, Through Hole, Radial, the Voltage (extreme right hand column), and check the In Stock box, then click on 'Apply Filters'. This should take you to a list of matching parts. From that list concentrate on ones with a 105ºC rating, that are the same size as the originals (or will fit), and the greatest life expectancy. Make sure they will sell onsies and twosies. Unless you are repairing a LOT of monitors, a box of 5000 is overkill.

                              Reviewing, you need

                              1ea 47µF 50V DigiKey P10321-ND @ $.28 ext $.28

                              1 ea 100µF 10V DigiKey P10219-ND @ $.30 ext $.30

                              2 ea 100µF 25V DigiKey P10269-ND @ $.23 ext $.56

                              2 ea 220µF 25V DigiKey P10271-ND @ $.38 ext $.76

                              2 ea 470µF 25V DigiKey P10275-ND @ $.57 ext $1.14

                              2 ea 1000µF 10V DigiKey P10225-ND @ $.59 ext $1.16

                              That totals to $4.20 plus about $2.00 for shipping. BUT before you order, enter each of these part numbers and make sure they will fit!! Height is important; just ask PlainBill what happened on his Mouser order.

                              As far as the VOM, if you are willing to spend a few bucks more, Harbor Freight Tools has an inexpensive DVM (37772-2VGA ) for about $25 that includes some very nice features.

                              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

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