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    #1

    Samsung LN-T4665F

    This was another Craigslist special. The owner was upset that the TV failed two years after he purchased it. He was even more upset when he discovered that the repair information was available on the internet, but all service shops he contacted insisted on replacing the power supply. He decided to go with a new TV. I readily agree to his asking price.

    Opening up the set revealed a pair of Samwha 2200uF, 10V caps with bulging tops in the power supply. The three other Samwha caps looked and tested perfect. Fortunately, I had replacements on hand, so a few hours later the TV was back together and up for sale on Craigslist.

    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.
    Tags: None
    #2
    Re: Samsung LN-T4665F

    Ha ha I'd love to be the guy to see that. That TV looks familiar!

    There are no repair shops anymore just module swappers especially those so called "repairmen" from the big box stores.

    Replace the PSU with another PSU with the same caps that will fail in another two years. Repeat business.
    Elements of the past and the future combining to make something not quite as good as either.

    Comment

      #3
      Re: Samsung LN-T4665F

      Mr Plainbill, at the risk of confirming the ignorance that I so spectacularly maintain, how do you come to a 'reasonable' price? How do you know the pedigree of those sets that would succumb to your tricks? With my luck, I would buy the one 'masterpiece' that requires both new caps, rectifiers, and output transformers --- and new CCFL lights.
      So I would pay someone to remove their piece of misery to make it my own...

      IOW, how do you know the dogs from the fleas??? And what is a reasonable recompense for said bitten dogs?
      tom

      Comment

        #4
        Re: Samsung LN-T4665F

        Originally posted by tmwalsh
        Mr Plainbill, at the risk of confirming the ignorance that I so spectacularly maintain, how do you come to a 'reasonable' price? How do you know the pedigree of those sets that would succumb to your tricks? With my luck, I would buy the one 'masterpiece' that requires both new caps, rectifiers, and output transformers --- and new CCFL lights.
        So I would pay someone to remove their piece of misery to make it my own...

        IOW, how do you know the dogs from the fleas??? And what is a reasonable recompense for said bitten dogs?
        tom
        First of all, it's PlainBill. There is no 'Mr.; I work for a living. OK, I USED to work for a living. Still, when I hear 'Mr.' I wonder if my father is standing behind me.

        Here is the process I use. Others may use other standards.
        1. I look for various catch phrases in the ad. "I don't know what the problem is, but is should be an easy fix." is someone blowing smoke. "Only two years old." or "I bought it two years ago." on something that went out of production 4 years ago indicates it's either being sold by someone with a very flexible memory or been bouncing around between multiple owners for 4 years.

        2. I get the model number and Google it twice, once with 'specs' and once with 'problems', then evaluate the information. A particular model Philips TV has a reputation for blowing caps in the (Samsung built) power supply. The symptoms are very clear even without opening the case. What is the demand for a particular set? A 50" Pioneer with only VGA and 5-BNC inputs isn't worth fixing unless you know someone who wants a low resolution 50" computer monitor.

        3. Can I make a profit by paying $xxx. for this? This is getting pretty hard to do with monitors, but is easy to do with TVs. In most cases, I limit the amount I spend unless I am sure the margins are right. In the case of this particular tv, I could have replaced the power supply AND the main board with ones from eBay, and still turned a slight profit.

        4. Does the seller have the original remote? Not only is it important for troubleshooting, if he does, he's probably pretty careful with his toys. The manual and original accessories are even better signs. It's much easier to sell something that looks like it just came out of the factory.

        5. Don't fall in love. If a quiet little voice is saying "Something doesn't make sense" (serial number scraped off!) or "This would be so KEWEL to have!!!", walk away.

        6. Multiple failures are pretty rare, unless someone has been using one set as a parts donor, and now has combined the bad parts into one set and is selling it. BEWARE of anything with missing screws. Don't even touch something with missing parts.

        7. Know your limitations. I passed up one set because the customer was honest. He was performing a software upgrade and unplugged teh memory stick before the upgrade completed. Now the set was dead. I am sure that with the proper equipment I could revive it - but what equipment?

        8. Is service information available? Not important with monitors, but vital with TVs until you get a lot more experience than I have.

        9. I don't haggle - much. If the sellers asking price is unreasonably high, I don't even bother. An example. Someone was selling a Philips 42PF7320D/37 with the 'flashing red led' problem (two bad caps in the power supply). Their asking price was $1400 firm because they "paid $2500 5 years ago". Even if I got them to knock $1000 off their asking price, it wasn't worth it.

        On this Samsung LN-T4665F, someone asked me "Would you take $xxx (2/3 of my asking price) cash today?" I replied "Sure. And when you come back with the remainder, you can have the TV!"

        Now, I also have a couple of advantages. I have 4 decades of experience with a wide range of electronics. I've learned to think the symptoms through, and not fall in love with a particular solution.

        I'm not dependent on fixing something to put groceries on the table. I can be selective about what I work on, and can take my time to think the problem through.

        And I have the resource of countless people here, people like Wizard and Krankshaft.

        PlainBill
        Last edited by PlainBill; 02-07-2010, 09:55 AM.
        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

          #5
          Re: Samsung LN-T4665F

          PlainBill,
          Thank you very much for taking the time to respond in such a clear and organized manner. You have made excellent points.
          I, too, am no longer working at a 'day job', so I fiddle at home. My experience is much more limited than yours, fixing sets for a few friends over the years, but no flat panels to date. Toshiba vertical caps, Samsung flaky FBT, RCA smps, and the oldest still around, a GR2000 I put together and gave Mom and Dad in 1978. Their first color set that actually had more colors than just green.
          I have chased down one problem that multiple shops apparently could not or did not want to take the time to find in a Sharp built in 1985. Still works and has an excellent picture. In essence, I am slow and take a lot of detours. I will literally stare at a schematic, trying to imagine what the signal should look like that is on individual traces. Now and again, I am right.
          Your research method makes a lot of sense. Perhaps you should not have been so generous with your brain product as now you will have more competition for those sets to be salvaged.
          Anyway, thank you very much. Seems the best part is to not 'fall in love' with anything, even if it would be 'neat', and have your $$ limit set before negotiating.

          tom

          Comment

            #6
            Re: Samsung LN-T4665F

            Originally posted by tmwalsh
            PlainBill,
            Thank you very much for taking the time to respond in such a clear and organized manner. You have made excellent points.
            I, too, am no longer working at a 'day job', so I fiddle at home. My experience is much more limited than yours, fixing sets for a few friends over the years, but no flat panels to date. Toshiba vertical caps, Samsung flaky FBT, RCA smps, and the oldest still around, a GR2000 I put together and gave Mom and Dad in 1978. Their first color set that actually had more colors than just green.
            I have chased down one problem that multiple shops apparently could not or did not want to take the time to find in a Sharp built in 1985. Still works and has an excellent picture. In essence, I am slow and take a lot of detours. I will literally stare at a schematic, trying to imagine what the signal should look like that is on individual traces. Now and again, I am right.
            Your research method makes a lot of sense. Perhaps you should not have been so generous with your brain product as now you will have more competition for those sets to be salvaged.
            Anyway, thank you very much. Seems the best part is to not 'fall in love' with anything, even if it would be 'neat', and have your $$ limit set before negotiating.

            tom
            OK, part of the deal for the advice is you stick to your territory, I'll stick to mine. You can have everything east of the Continental Divide. I'm claiming everything in Maricopa and Pinal counties in Arizona that I can get to first. No poaching!!!

            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

              #7
              Re: Samsung LN-T4665F

              PlainBill, I have no intention of poaching. My wife won't let me bring anything else into the basement until I get rid of stuff that's already there...
              I will maybe keep up with craigslist stuff just for entertainment, and perhaps research some if the model # is given, but those are few and far between. Mostly it is 'BrandX 32" for sale. Doesn't work.' which is not much help.
              tom

              Comment

                #8
                Re: Samsung LN-T4665F

                Originally posted by tmwalsh
                PlainBill, I have no intention of poaching. My wife won't let me bring anything else into the basement until I get rid of stuff that's already there...
                I will maybe keep up with craigslist stuff just for entertainment, and perhaps research some if the model # is given, but those are few and far between. Mostly it is 'BrandX 32" for sale. Doesn't work.' which is not much help.
                tom
                I break TVs down into two catagories - the grade A stuff (generally 'old line' manufacturers who have extensive service and support capability) and the junk - brands that have no support information available.

                In general, service manuals can be found for Mitusbishi, Philips, Samsung, Sony, and a few other brands. I will be willing to pay $100 or more for one of these with what appears to be a repairable problem. Stuff like Polaroid, Memorex, Visio, Insignia, Dynex can be much harder to work on because no service literature is available. Still, I'd take one of them IF the symptoms match bad capacitors and the price is low enough.

                When the ad doesn't specify a model number (most don't) I email and ask the seller for the information.

                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

                  #9
                  Re: Samsung LN-T4665F

                  I have this LNT4665F that clicks and will not turn on. No backlight. Opened up and all 6 caps were defective. Replaced them with panasonic caps 1000uf 25v and i still have same problem. Disconnecting main board and applying jump on power pcb (PS-On - Stdby and DET to Inv ) the tv comes on, there is backlight, no clicks. Isolated T-Con and I'm left with the possibility is the main board.

                  Any suggestion on what I could check on Main Board? Eprom ?

                  Thank you in advance!

                  Comment

                    #10
                    Re: Samsung LN-T4665F

                    Found the main board within my stored boards and replaced. It worked! I did experimented swapping Eprom and that did not fix original board.

                    Comment

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