Question about Samsung Televison & Video

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Samsung TV Model # LN40A330 Have changed two 1,000 uf Capacitors in power section that were convex on top. Now when turned on get tone and a small red light. Before changing caps it would not turn at all. Now what?

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  • murthapj Mar 17, 2011

    This TV is new to me; but, I did see a mention in the Operation Manual that there is an option to have a turn-on tone and a turn-off tone. You say that these tones mean that there is a short in voltage regulator??????

  • murthapj Mar 17, 2011

    This TV is new to me; but, I did see a mention in the Operation Manual that there is an option to have a turn-on tone and a turn-off tone. You say that these tones mean that there is a short in voltage regulator??????

  • murthapj Mar 17, 2011

    Yes, they are installed with the correct polarity.

  • murthapj Mar 17, 2011

    Is CN801 the 24 pin connector? What pins do I check?

  • murthapj Mar 17, 2011

    Now I do not read any voltages there is no tone and no red light.

  • murthapj Mar 17, 2011

    I can not measure any voltages, there is no red light, and no tone?

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2 Answers

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  • Master
  • 1,961 Answers

Hi, did u have a multimeter? you have to measure if the power supply has a complete voltage output in order to power up your T. there are 3 voltage requirements/output from your power supply.they are ;

1)5 volts -this voltage use to power up the mainboard
2)12 volts - this is a supply for the audio amplifier(sound)
3) 24 volts - this the supply for the backlight lamp.The lamp is the illuminates the screen.

I these voltages are present then your TV will turn on.there are reasons why the power supply doesn't turns on.When there is a shorted circuit on the section being supplied by the power supply the power supply will shut down.this is a fail safe operation of the power supply to prevent further damage and fire.The primary suspect of a shorted section in an LCD TV is the inverter section. this section is the supply of the lamp.the primary voltage input of this board is 24 volts and the output voltage is 100 volts AC.check the components of this board for any shorted.Check the diodes,transistors,regulators,and the ballast transformer.or you can replace them with a new board.They are available at stores on line.
After changing the capacitors at the power supply section and still it wont power up check also for any open resistors.All resistors must have a resistance if you measure an open resistors replace it immediately with the same color code resistance value.This power supply is also replaceable.this is available at shoppejimmy.com just search for you model and brand of your TV.I'll give you the link..

Posted on Mar 17, 2011

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  • Samsung Master
  • 2,098 Answers

Hi murthapi,
Tone that you heard means that you're supply voltage gone to shorts. Shorted parts is you're voltage regulator transistor(mounted in heat sink) in line with this capacitor. If you're not familiar troubleshooting the said parts, you may replaced the entire board for your convenient, click this link http://shop.ebay.com/i.html?_nkw=LN40A330&_sacat=0&_odkw=37RV530U&_osacat=0&_trksid=p3286.c0.m270.l1313.
http://www.shopjimmy.com/catalogsearch/result/?q=LN40A330.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Posted on Mar 17, 2011

  • 4 more comments 
  • Jdvillanueva
    Jdvillanueva Mar 17, 2011

    Sorry I'm assuming that the tone was coming from the power supply. Check the polarity of the new installed cap if it is in the right place...

  • Jdvillanueva
    Jdvillanueva Mar 17, 2011

    If you have a multimeter check the output voltage in line with this new installed cap. Let me know the reading...

  • Jdvillanueva
    Jdvillanueva Mar 17, 2011

    check all output voltages in CN801.

  • Jdvillanueva
    Jdvillanueva Mar 17, 2011

    You're reference voltages are printed in the board itself if you don't have an schematic diagram...

  • Jdvillanueva
    Jdvillanueva Mar 17, 2011

    If none voltages at the output means that you're volt regulator section didn''t go into complete cycle. You have to check for an open fusible resistor. Check also the voltage regulator transistor (mounted in heat sink). If you have a capacitor checker, test all capacitor near the 2 1000uf cap that you've already replaced.

  • Jdvillanueva
    Jdvillanueva Mar 17, 2011

    Another option, if you can't troubleshoot the said parts, bring your power supply board to repair shop or look for a qualified technician to do the job for you but I think its is much cheaper if you will buy a new board rather than repairing it. I've suspected that you're board has a factory defect since you've mention that it is a new unit.

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I know that it is in the low volt supply because there is no sound or pic. How if u unplug the tv for about 30min. and plug it back in the tv will come on.


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Change these where possible with the same uf but higher voltage lets say 1000uf 25/35v
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Please rate my reply++++

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Hi my name is Eric,
I hope I can help you with your issue ,
If the TV is totally dead a voltage test would tell if its the power or mainboard (only two boards in the TV)
The TV not starting properly you should hear the tone noise (bleep bleep) not a ticking noise or no sound.

A long time coming on is a classic example of what I am detailing for you below. .
These Samsung LCDs have problems with the power supply capacitors going bad, a servicer will charge between $200 and $450 to repair it replacing either the capacitors or the whole board.
here is a DIY (do it yourself) solution:
It could be just a few bad capacitors on the power supply, if you want to attempt the repair yourself you can do a visual of the power board caps will appear swollen on top.
We do not recommend do it yourself, but depending on your knowledge and technical ability you may be able to.
with the back removed you will usually see two circuit boards the upper one is the power supply, it has a few capacitors on it (cylindrical standing straight up soldered in mark on the sides with the positive/negative sides and uf and Volts values)
Samsung uses mostly 1000uf at 16Volts rating capacitors, they cost about $1 each (680mfd will also work fine)
usually I replace about four of them (or all the bulged on top ones) .
To buy capacitors click here
The power board and back unscrew with a medium philips screwdriver, if you do not know how to desolder and resolder then do not attempt this as you may damage the TV more than fix it.
Im am posting a photo of some swollen caps on a board so you know what they look like below


 
best of luck to you
If you feel good about my solution please click accept.
If you have more questions you can still respond until this post expires,
I will reply asap
Thanks

32c0e20.jpg

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Hope this helps
Please rate my reply++++

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