Question about Samsung HCL4715W 47" Rear Projection Television

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Samsung HC-P4752W No power

Hello,
The LED comes on and blinks three times. No power, but I can hear the high voltage flyback at startup. I suspect one of the low-voltage supplies. This set has a half dozen low-voltage regulators. I guess I'll have to purchase the service manual. Anyone have a solution?
Thanks,
-Dan

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  • Dan Smith
    Dan Smith Jul 04, 2008

    Thanks for the advice:

    Yes, I have disconnected the covergence yokes. When I do, one of the tube filaments lights up for a few seconds, then goes out and still no power.

    Thanks again!



  • wd401979 Jul 18, 2008

    no power timer led light comes on blinks three times and shuts off you can hear something in back come on

  • Dan Smith
    Dan Smith Oct 11, 2008

    Turns out one covergence IC was blown. Two pairs of 3.9 fusible resistors were open. Replaced both IC's and resistors. Unfortunately, the set suffered a bit of phosphor burn, two 3" lines at the top of the screen. I unplugged all connectors going to the yokes which may have caused the burn. Thanks very much for the help!

    -dan

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  • Samsung Master
  • 8,617 Answers

Have you tried unplugging the convergence yokes and then try powering up the set? Its not uncommon for that chassis to shut the set down when the ICs are bad.

Posted on Jul 04, 2008

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Oct 13, 2009 | Samsung HC-P4752W 47" Rear Projection...

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look for trouble in the low voltage and or high voltage power supply circuits. the popping sound could be an exploded safety capacitor in the horizontal output to the flyback transformer. the horizontal output transistor maybe damaged. chances are the low voltage regulator is also damaged.

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There are three main reasons that convergence can still be inoperable after replacing the convergence amps. One, when the amps failed they blew the fuses protecting the power supply from shorts. Two, when the amps failed the yoke return biasing resistors burned open. And Three the Digital Convergence Unit has failed. Once things have gotten to this point it is usually time to have a professional have a look at the set.

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Replace the Power deflection board that should solve your problem. You can get a replacement board for your model at the following link.
http://servicemanuals.vstore.ca/product_info.php/pName/p59a-pwr-def-board/cName/samsung-parts

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Replacing a flyback is not something I would suggest for anyone with no electronics experience. Second, lets see where the noise is coming from first. Take off the back and listen to the noise. The flyback will be at one end of the large red wires that go to the tubes. Sometimes the connection at the tube is not 100% and the noise comes from there. BE CAREFUL - there are high voltages going through this red wire that can be dangerous even with the set UNPLUGGED!! IF the noise is coming from the connection at the tube, with the set unplugged, carefully turn the rubber cap back and forth touching only the rubber part with one hand. Put the other hand in you pocket while doing this.

If the noise comes from the flyback side, if you can solder, again with the set unplugged, try resoldering the pins on the transformers. That may resolve the problem.

Keep me posted.
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Not sure of the part number most use STK392-110 or 120s . You will need to look at the ics in your set they will have the IC numbers stamped on them they will have STKxxx-xxx whatever that number is thats the sanyo part number for those ICs

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These sets had a serious crt problem.Check and see if there is any arching on the tubes or tube sockets.

Mar 07, 2008 | Samsung HC-P4752W 47" Rear Projection...

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