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samsonite
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Last Activity: 02-03-2019, 01:44 AM
Joined: 07-19-2015
Location: Detroit, MI
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    It's tempting to buy another board, but I've already invested some money into this project.

    But, if I were to buy one, it would have to be a 100% working board. Not a repaired or salvaged board. It would have to be a board with new parts that have been replaced. Some people advertise repaired or salvaged boards as "refurbished", without replacing a single part. I already have an old board with old parts, I don't need another one.

    BTW, the Ebay pic of the backside of the board, it looks...
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    Last edited by samsonite; 02-03-2019, 01:43 AM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Well, it's not too pretty. The board still has flux on it, and I put too much solder on the pads, and had some trouble getting it off, so I left it for now. And I accidently got some solder on R107, and had some trouble getting that off too, which is why R107 looks charred. And you can't tell from the photo, but the SMD does have a small stripe on one side indicating positive polarity, but not visible here.

    BTW, is there anyway to reset the power cycle on a TV, so it no longer blinks when plugged in? It seems to...
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Well, I finally got C102 off, got rid of my new capacitor too, and replaced it with a new SMD cap (KEMET 399-18658-1-ND). Powered up the TV and still not working. Red LED light keeps blinking forever. So, either the problem is somewhere else, or I toasted the board.

    And I can't measure any voltages, because this is the backside of the board. After I screw the board in, and hook the cables up, you can't access it. Also, this board has 4 grounding screws, so I always make sure they make good contact with the board...
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    It must be the lighting, because it's really some kind of black plastic plug. Specs call it "sealing rubber". The cap doesn't look ruptured. That's the way I received it.

    I was looking at these.

    P11196-ND (FC)
    47uF 16V Aluminum Electrolytic Capacitors Radial, Can 1000 Hrs @ 105°C
    [url]https://www.digikey.com/product-detail/en/panasonic-electronic-components/EEU-FC1C470/P11196-ND/356100[/url]

    P14478-ND (GA)
    47uF 10V Aluminum Electrolytic Capacitors Radial, Can...
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    Last edited by samsonite; 01-29-2019, 06:50 PM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on



    Yes, I realize I would get a better connection if the capacitor legs actually touched the pads instead of being blobbed on, but that's the best I can do with the tools I have. I don't have the hottest iron or the smallest diameter solder core right now. But, I think I'm going to put this project on hold for another week until I get some better stuff. Thanks....
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    Last edited by samsonite; 01-25-2019, 06:59 PM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on



    That sounds like a good idea. I was trying to wick away solder instead of adding more. But my luck, the solder will ball up and stick to the iron instead.

    As for the voltage, sorry, I don't know. How do shops test these boards when they only have the board and no TV?...
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    Last edited by samsonite; 01-24-2019, 11:37 PM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    I may try to re-solder C102 again. I think I need a cheap heat gun, because it isn't coming off for me.

    And C131 is on the opposite side of main board near a power connector. It looks crowded, so I will have a difficult time with it without a heat gun....
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    This video at 5:00 explains that both c102 and a nearby 8-pin IC chip should be replaced:
    [url]https://www.youtube.com/watch?v=oC4f2Ik8rCI[/url]

    They also used a heat gun and tweezers to remove that stubborn SMD, btw. I don't have a heat gun, so I would
    need some kind of heat clamp to remove the SMD in one go.

    My IC chip says:
    MP2363DN
    83833419
    MPS818

    My Main Board:
    BN41-00975B (2008.01.13)
    MODEL: PEARL

    This link doesn't describe the...
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Sure, I added a before and after pics.

    Looking at this pic in the link, it's hard to tell where they solder the negative end of the cap. Did they dig into the board and create a ground spot? Why didn't they solder it to the end of the SMD chip? Not enough room?

    [url]https://www.badcaps.net/forum/showthread.php?t=45913&highlight=c102[/url]Re: Samsung LN40A550P3F 40" HDTV, sl...the link, it's...
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    Last edited by samsonite; 01-22-2019, 11:24 AM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Is it worth testing multimeter voltage levels? If the red LED light is blinking, can I assume the main board is getting 5V standby power? As the main board controls the blinking LED light, as well as the on/off signal from the remote control, which both seem to work?

    I already replaced the power board, and that didn't fix the problem, so only the main board is left?
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    Last edited by samsonite; 01-22-2019, 09:41 AM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Just an update. I finally got a 40w iron, and... the solder still won't flow. It must be spot-welded on or something.

    I went for plan B, and solder a 47uF cap across the SMD chip, making sure the leads matched the polarity of the SMD. I assume the marked end of the SMD chip is positive.

    I turned on the TV, and nothing happened. The red LED light continues to blink on/off.

    Meanwhile, the TV has gotten progressively worst. Before it took 10 minutes to turn on, now it takes over an hour. Not...
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Thanks for the advice. I think I'm gonna put everything on hold for a week until I can get the right tools for the job. A 40w iron sounds just about right. Thanks.
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Sorry, typo. Only 25w.
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Well, I was able to order some capacitors from Digikey, but I've got a small problem. My 25W soldering iron doesn't seem to be hot enough to melt these contact points. No solder is coming off.

    If I solder capacitor leads across this SMD chip, will it be a problem if the capacitance doubles from 47uf to 94uf?
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    Last edited by samsonite; 01-08-2019, 02:24 PM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on



    Ah, I didn't know what you mean until I saw this thread:
    [url]https://www.badcaps.net/forum/showthread.php?t=45913&highlight=c102[/url]

    He replaced the SMD with a radial lead capacitor. Nifty.

    Just wondering if my board will screw back into place after putting a big capacitor like that behind it?
    I could do that instead of chasing around for the perfect SMD component.

    Found two SMDs that should fit:

    47uF Molded Tantalum Polymer Capacitor 10V, (3.50mm...
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    Last edited by samsonite; 12-30-2018, 12:50 PM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    How big of a SMD component can I fit in C102? I looked at 10v and 16v capacitors on digikey, and the SMD dimensions increase
    with larger voltage. I found these lines:

    C102
    2409-001118
    Samsung C-polymer,Chip;47uf,20%,10v,wt,tp,3.5x2

    Must SMD stay within same size of 3.5mm x 2mm ?

    Maybe this one:
    AVX Tantalum Capacitor
    [url]https://www.digikey.com/product-detail/en/avx-corporation/F931A476KAA/478-8223-1-ND/4005652[/url]Re: Samsung LN40A550P3F 40" HDTV,
    See more | Go to post
    Last edited by samsonite; 12-29-2018, 02:41 PM.

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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Thanks, I may try it.

    Just a question, in the repair video, they were using solder paste. I'm assuming solder paste is only practical for heat gun owners, not for soldering irons?
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  • samsonite
    replied to Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN40A550P3F 40" HDTV, slow to turn on

    Thanks for the reply.

    My main video board:
    BN94-02077C

    Found a replacement, but out of stock:
    [url]https://www.shopjimmy.com/samsung-bn94-02077c-main-board-for-ln40a550p3fxza.htm[/url]

    Found a repair video, but I have no heat gun for surface mount work, just a 45W desoldering iron:
    [url]https://www.youtube.com/watch?v=oC4f2Ik8rCI[/url]Re: Samsung LN40A550P3F 40" HDTV, sl.../> BN94-02077C
    See more | Go to post

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  • samsonite
    started a topic Samsung LN40A550P3F 40" HDTV, slow to turn on
    in Troubleshooting TVs and Video Sources

    Samsung LN40A550P3F 40" HDTV, slow to turn on

    Hello,
    I have a Samsung LN40A550P3F 40" HDTV. Bought in 2008, so it's about 10 years old.

    For the last couple of months, it's been slow to turn on in the morning. I've timed it, and
    it's anywhere between 5 and 10 minutes. The TV has a red power light that continuously blinks
    until the TV turns on.

    I recently took the back off, and looked at the caps, but they all look ok to me. No bulging caps.
    I'm the original owner, and the power board appears to be in pristine condition.

    I didn't know what else to do, so I bought a "refurbished"...
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    Last edited by samsonite; 12-29-2018, 06:30 AM.
  • samsonite
    replied to Logitech mice?
    in Troubleshooting Game Consoles & Other Weird Devices
    Re: Logitech mice?

    I actually have 3 mice of the same brand laying around, in various states of wear. The older ones still work, so I swapped out the cable with the newer "broken" one. The USB cord of this particular brand of Logitech mouse is not soldered to the board, so you can pull it out of its socket with some applied force. But nothing happens plugging it in and out. I think the quality has gone downhill in the last years and the entire batch is just faulty out of the box. This is the 3rd one since the start of this year. It never lasts more than 15-30 days, under...
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