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Thread: Samsung Plasma No Picture

  1. #1
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    Samsung Plasma No Picture

    While using the tv it lost picture without warning. I can't tell if the sound still works because I normally have it off in the settings.

    The indicator light tells me the tv turns on and off fine and responds to controls however I cannot see the menu to try anything.

    I've tested the one fuse I could fine and it is not blown.

    One interesting observation I have made is that the board responsible for the normal plasma buzzing only buzzes for 2 seconds on startup and then stops. I would guess this is a good clue but I don't have the expertise to figure out what it means.

    If anyone has knowledge on plasma televisions it would be greatly appreciated.

  2. #2
    Administrator Tracy Rainwater's Avatar
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    I am no expert on Plasma repair, but about 90% of displays that die have issues with the power supply. There is low voltage required to operate all the logic on the circuit boards (5 and 12 volts DC). The Plasma display itself is a higher AC voltage.

    Unless you have a digital multimeter and some skills testing electrical components, I would contact a local repair shop.

    The only other thing I can suggest is to unplug it for about 30 minutes and see if anything happens when you plug it back in.

  3. #3
    Moderator jerrich's Avatar
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    My 32" Sammy lcd died a while back and the repair man said it was a bad capacitor in the PS. I think there was a bad run of caps back then.
    JR

  4. #4
    Administrator Tracy Rainwater's Avatar
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    Quote Originally Posted by jerrich View Post
    My 32" Sammy lcd died a while back and the repair man said it was a bad capacitor in the PS. I think there was a bad run of caps back then.
    JR
    Exactly.

    I find that most electronics in general, die from failed capacitors. This is especially true about components that get hot and Plasma displays aren't really known to run cool. That's what killed my power amp.

  5. #5
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    Pathetic..

    Quote Originally Posted by Tracy Rainwater View Post
    Exactly.

    I find that most electronics in general, die from failed capacitors. This is especially true about components that get hot and Plasma displays aren't really known to run cool. That's what killed my power amp.
    Me not you. I have been an analog electronics engineer for over 40 years and my two Samsung plasmas are the first devices I've owned that I have absolutely no clue how they work. Let's hope they last for a long time and don't die at the same time. Like I said pathetic but true!

  6. #6
    Administrator Tracy Rainwater's Avatar
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    Quote Originally Posted by Trevor_Bartram View Post
    Me not you. I have been an analog electronics engineer for over 40 years and my two Samsung plasmas are the first devices I've owned that I have absolutely no clue how they work. Let's hope they last for a long time and don't die at the same time. Like I said pathetic but true!
    Very few places do component level repairs anymore. It's standard procedure to just replace an entire module or board. The problem is, there's going to be few if any sources for replacement parts on Plasma displays.

  7. #7
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    Alright well after doing much more research on how plasmas work and looking at some service manuals of similar models I began taking readings.

    According to the tests I performed which involved reading voltages it looks like a power supply issue.

    When I was looking at the symptoms of the different boards I first thought it was the y sustain. But now it appears the power supply is not giving the voltage it should to the y sustain.

    There should be about 200 volts there when my meter says 10.8.

    Btw doing a visual inspection of the entire tv I didn't find any sign of bad capacitors which usually bulge when they fail.

    Checked for shorts on main voltages but seemed fine.

    Hopefully whatever the problem is a new power supply will fix this.

  8. #8
    Administrator Tracy Rainwater's Avatar
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    Look for cracked solder joints or places where the board is discolored.

    Also, just because the caps aren't bulging, doesn't mean they're good.

  9. #9
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    So in the middle of testing the power supply caps I read some more articles and most of them suggest a y sustain based off my symptoms and test results.

    Being that only one trouble shooting article really led me to power supply I figured i'd go ahead and get a y sustain which involves getting a y buffer too.

    Long story short i've fixed a $600 tv for $40 with a multimeter and some help from google.
    TrippleJ and Tracy Rainwater like this.

  10. #10
    Administrator Tracy Rainwater's Avatar
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    Nice !!! I love hearing stories of DIY repairs that save you a ton of CA$H.

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