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Acer AL2423W LCD Monitor - Bad caps

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    #21
    Re: Acer AL2423W LCD Monitor - Bad caps

    man i love hearing about this!
    though the OP i am simply amazed you found rubycon and UCC in a "new" monitor
    my bet is it was 4 years old, it was already worked on once before

    it seems there are 3 or 4 of this psu/ inverter here in the forums with the same pcb boards

    mine is acer x241w sd mid 2007

    all the luck to everyone who comes across them in the cheap junk bin
    because i did not check everything it seems i have some other problems
    and now fixing it isnt much of a cost viable option either
    ...unless you have a spare xad306lr you want to ship to me!


    ha, yeah taepo and capXcon...
    luckily i can get pico fuses down the road also

    well my donated one gets to sit in its box until something else comes up

    meanwhile i get to work on a dell BENQ psu next
    yay me with my valuable knowledge and time

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      #22
      Re: Acer AL2423W LCD Monitor - Bad caps

      Can someone describe what a "pico" fuse is and what it looks like? I pulled apart my Dell SP2208WFPt, symptoms were no power, no front lights. PSU/inverter board has plenty of CapXon caps, but none look particularly suspect (ie bulging). Should I just change them all out?

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        #23
        Re: Acer AL2423W LCD Monitor - Bad caps

        Originally posted by pjt View Post
        Can someone describe what a "pico" fuse is and what it looks like? I pulled apart my Dell SP2208WFPt, symptoms were no power, no front lights.
        A pico fuse is just another type of fuse. It usually looks something like this

        http://media.digikey.com/photos/Litt...1%20SERIES.jpg

        It will be marked PF on the PCB board. Something like pf500. It could be the main fuse right by the AC input that is bad, but not likely the picofuse. A good fuse should measure 0.3 ohms.

        If you are not getting power (no power LED), your problem is unlikely to be a picofuse.

        Do you have a multimeter? If yes and you are experienced in electronics, you can measure the DC voltage across the main filter capacitor (the biggest one on the board). That DC voltage should be 1.4 * mains line voltage.

        Also post clear focused pictures of your boards (top down view - both sides) after reading

        https://www.badcaps.net/forum/showthread.php?t=1868
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          #24
          Re: Acer AL2423W LCD Monitor - Bad caps

          I have this same monitor and subsequently the monitor failing is how I came across this forum. Great information! My monitor was experiencing a cross-hatch (read flannel) pattern when I turned it on. When I took the back off I got the same bloated capacitors as shown in the pictures on the thread. I was just going to replace the whole power board if it was cheap enough, but I think I will replace the capacitors at this point so the monitor lasts a fairly long time.

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            #25
            Re: Acer AL2423W LCD Monitor - Bad caps

            Originally posted by xfeastonarsex View Post
            When I took the back off I got the same bloated capacitors as shown in the pictures on the thread. I was just going to replace the whole power board if it was cheap enough, but I think I will replace the capacitors at this point so the monitor lasts a fairly long time.
            A power board will probably cost you around $60. New caps will cost no more than $10.

            In addition, the power board will likely be used and have used caps.
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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.

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

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              #26
              Re: Acer AL2423W LCD Monitor - Bad caps

              Originally posted by retiredcaps View Post
              A power board will probably cost you around $60. New caps will cost no more than $10.

              In addition, the power board will likely be used and have used caps.
              This is exactly what I was thinking, not to mention I love to tinker, so it should be a fun little project that will save me some money.

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                #27
                Re: Acer AL2423W LCD Monitor - Bad caps

                Hello,
                My AL2423 is starting to fail as described here...
                I will take pictures next time it does it...
                Good for me I have a fairly good 50Mhz Scope

                Anyone's got recommendation, since it's not totally dead yet ?
                For now, I removed the DPMS power save, so it should live a bit longer...

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                  #28
                  Re: Acer AL2423W LCD Monitor - Bad caps

                  Originally posted by pmichel View Post
                  Hello,
                  My AL2423 is starting to fail as described here...
                  I will take pictures next time it does it...
                  Good for me I have a fairly good 50Mhz Scope

                  Anyone's got recommendation, since it's not totally dead yet ?
                  For now, I removed the DPMS power save, so it should live a bit longer...
                  I would suggest you DO NOT wait until your monitor completely fails. If the current problem are only bad caps, then you'll get away with a $10-$12 fix. By waiting, you're allowing badly filtered DC voltage to reach other components, causing overheating, which can lead to a more costly and time consuming failure.

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                    #29
                    Re: Acer AL2423W LCD Monitor - Bad caps

                    Hello Jetadm !
                    You convinced me...
                    and by the time I receive the replacement parts, the monitor had become unusable...

                    I changed all the caps of the power board for Panasonic caps (5000h+ endurance),
                    that is:
                    C14,C15 : 1000uf 16v (mine were inflated exactly like shown on some pictures on this thread)
                    C22 : 4.7uf 250v
                    C13, C16 : 100uf 25v (one was severely inflated)
                    C23 : 10uf 50v
                    C24, C25 : 33uf 35v
                    C32 : 22uf 50v
                    C10,C11,C12 : 680uf 25v
                    C30: 22uf, 25v (this one though I didn't like my replacement part, so I installed a 22uf 50v)

                    I tripled-verified the weldings
                    and then put the power ....
                    ...back like new !!.... (which is an understatement because nowadays LCDs hardly outspec this monitor!)

                    For now, I didn't change the caps on the video board, they are all teapo ... I read they are bad...
                    but I bought the replacement anyway...for the future...in case problems start again

                    Thanks for all the info on Badcaps.net
                    ------

                    Question...
                    In my mind, a 100uf 25v cap will behave exactly the same
                    as a 100uf 100v cap ( with signals <25v )
                    but... I never tried to measure the difference... has any of you experience a difference with caps of different voltages ?

                    tx

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                      #30
                      Re: Acer AL2423W LCD Monitor - Bad caps

                      I just had to recap the inverter board....I turned it on today and about 30 seconds later I heard a loud POP, and the lamps on the left side had gone out (makes for a goofy looking screen)! ...one of the 3 180uF 30v caps had vented, another was swollen, and the last one still looked ok....I changed all 3 and once again, shes back in action.....but lesson to those working on this monitor, just go ahead and recap the inverter board while you're at it.
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                        #31
                        Re: Acer AL2423W LCD Monitor - Bad caps

                        On all the monitors I've worked on, the inverter board was part of the PSU
                        I love putting bad caps and flat batteries in fire and watching them explode!!

                        No wonder it doesn't work! You installed the jumper wires backwards

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                          #32
                          Re: Acer AL2423W LCD Monitor - Bad caps

                          Originally posted by c_hegge View Post
                          On all the monitors I've worked on, the inverter board was part of the PSU
                          Not on this one....it has a dedicated board for that....its a huge ass board that runs the entire height of the monitor. If you look at the pics, its the board under the metal cover on the side with the vent holes in it.
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                            #33
                            Re: Acer AL2423W LCD Monitor - Bad caps

                            I should have read this thread first before closing it back up so I would have gone ahead and replaced the caps on the inverter board. Too late now, but i'll probably sell the monitor soon.

                            My issue was the monitor would be on, but take a while to light up, maybe a good 10-20 seconds of the Acer logo going, sometimes longer. When it finally displayed the image I would get the "No Signal" overlay from the monitor, even though it was still displaying the image perfectly. Every 5 minutes or so, it would finally detect the signal ( mind you its already displaying the image ) and restart and the "No Signal" message would go away. It continues to cycle through this every so often. Seemed like a power issue so I opened it up and found several bad caps. I only had time to replace the ones noticeably bulging, I did not ESR test every single cap.

                            Replaced the following bulging or pushing up from the bottom :
                            CS16 : 100uF 25V replaced with 220uF 25V
                            CS13: 100uF 25V replaced with 220uF 25V
                            CS14: 1000uF 16V 10mm replaced with 1000uF 16V 8mm

                            Replaced the two 680uF under the heatsink with 1000uF of same or higher voltage ( don't remember cap positions, I was relying on images on the first post for positions since I already closed her up ).

                            Obviously my caps weren't ideal replacements but they were all I had at the time. Monitor works fine now and is still extremely bright. Bought it a few weeks ago for $50. Didn't notice it even had speakers since they face down and don't show a grill. Accidently broke wires from the connector when I was trying to pull it off the board so it took a little while to figure out the wiring and resolder speaker wires to the crimps. Couldn't find pics for the wiring so I had to go ahead and just tried all the combinations until speaker worked again, although i have it set to stereo but both speakers go off when I test one or the other.... not sure if its because i rewired it wrong, or my audio cable is not stereo.

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                              #34
                              Re: Acer AL2423W LCD Monitor - Bad caps

                              This display is full of crap, besides the first one I got some time ago (with nasty cold joint under freewheeling diode on primary and crap caps on secondary), the second one I just repaired got the rest of caps bad. Namely the 4,7 uF/250 V sitting on primary PWM chip with 120 ohm ESR, than all those 330uF caps on signal board also with one 22uF/25V general purpose cap in there having 13 uF and 15 ohm ESR. Changed every single non-quality cap in there which was terrible work, soldering these Acer signal board is messy job.
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