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topperdude
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Last Activity: 03-28-2013, 08:33 AM
Joined: 11-08-2009
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems



    Thanks for clearing up the (mis-)information I must have picked up elsewhere!


    It must have been one of those times when my brain is thinking IPA and the hands are typing ISA


    Thanks for clearing up another bit of (mis-)information. I do not smoke but know some non-smokers who might be tempeted to use it to douse a smoker as well


    Thank you for the tip on glycerin. Come to think of it - we (finally) got a Walgreens locally and this could be a good reason...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems



    Bill - I tried an old toothbrush that was dipped in water (before I posted my question about cleaning the residue in this thread yesterday) but that didnt remove the residue at all. Maybe ISA will be better.

    Would appreciate some follow-up clarifications:
    [list]What is the risk in not cleaning the residue from the board? Just asking as I will need to disassemble the monitor again to get to the inverter board.[/list]
    [list]I understand ISA is supposed to be highly flammable. How long does it take for...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems



    Thanks for the response PCBONEZ. However, as I mentioned in my last post, I have already purchased the capacitors and re-capped the board. What I am now wondering is whether I need to clean the residue (possibly from the 60/40 rosin flux in the solder linked in my last post?) before using the monitor and what the risks might be of not cleaning it? If cleaning the rosin flux residue is reccomended, what product should I used to do so?

    Thanks again,
    -Topper...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems

    Thanks to the advice and information in this and other threads on this forum (as well as some other sites), it looks like recapping the inverter board with the capacitors above has fixed the monitor!

    I do have one additional question before putting the monitor back in service - I used [URL=http://www.radioshack.com/product/index.jsp?productId=2036305]this 60/40 rosin core solder from Radioshack[/URL]. I dont have any pictures of the recapped board currently (since I had reassembled the monitor in my eagerness to test whether it works...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems

    Finally got my capacitors yesterday. I am using a soldering iron quite similar to the one recommended [URL=https://www.badcaps.net/store/product_info.php?cPath=28&products_id=88]here on badcaps[/URL].

    Wondering what I can use to clean the oxidation from the tip of the iron? Someone suggested using [URL=http://www.hakko.com/english/products/hakko_599b.html]this Hakko Tip Cleaner[/URL] but dont have any stores locally carrying it and would prefer not delaying the project past this weekend waiting for this to arrive from an online...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems



    Thanks for pointing out that link, PlainBill. Although useful to get a general idea of the different series, it appears that list might not have been updated in some time now (since 2006)? Many of the online sites (digikey, mouser, newark) seem to have series from various manufacturers that are not listed in that post. Similarly, series listed in that post that are not listed at the online sites.

    In any case, I ended up not substituting the backordered capacitors (for the time being). I remembered I had few other electronics...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems

    My order with digikey has not shipped yet since two of the FM series capacitors (1000uf @ 25v and 2200uf @ 10v from my list below) are on backorder. On Monday (March 15) when I talked to them, they were expecting them in stock by March 16 and ship out some time this week. Today when I called, it seems their Panasonic contact person looked into this further and confirmed they are in transit but will be delivered to digikey on 03/22 after which they will be shipped to me.

    Wondering if:[list]Its worth it to wait till 03/22 to get the...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems



    PlainBill,

    Thanks for the response!

    I am more concerned about properly removing the 'white stuff' glue before desoldering the capacitors without damaging any other components (for example the component sandwiched between the two bulging capacitors marked as '3R3' in the picture attached in my previous post).

    Thanks again,
    -Topper...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems

    Spent some time over the weekend going through the various recommended websites to find one that might have all of the replacement capacitors needed.

    Am getting ready to finalize my order with Digikey as they had almost all the replacement capacitors needed and the two that are out of stock are expected by 03/16/2010 so hope to have the capacitors sometime this week.

    In the meantime, I would like to de-solder the current capacitors on the board and get it ready when the replacements come in. Would appreciate some advice...
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  • topperdude
    replied to Monitor power supply problems
    in Troubleshooting Computer Displays
    Re: Monitor power supply problems

    Thanks for the reply!

    Am looking at digikey's catalog - I dont see ripple listed as a filter - would ripple be the same as Tolerance?

    Thanks,
    -Topper
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  • topperdude
    started a topic Monitor power supply problems
    in Troubleshooting Computer Displays

    Monitor power supply problems

    Hi,

    I have a Westinghouse LCM-22w2 monitor that stopped working recently. When I turn on the monitor, there's nothing on the display, none of the lights come on, nothing! The first one or two times when I tried to plug it into different outlets to test, I did hear a high-pitched sound (capacitor going bad?) but not anymore.

    On going through some of the posts on these forums, I suspected whether the power supply might need to be repaired. So, I opened up the monitor last night and sure enough looks like atleast two of the capacitors have gone bad. See images below:...
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