Question about HP Lc4276n 42 in. LCD Television

2 Answers

My HP LC4276N TV is 27 months old. A few days ago, the sound just ceased working. Of course, I checked the settings to ensure that "mute" was not activated and that the setting for speakers was "on". I then also tried connecting auxiliary speakers, but to no avail. Could this have been caused by a blown fuse? A bad capacitor? Or is there another likely cause? I would love any detail on how to check any of these potential problems, or any suggestions for repair. (I have no experience in this sort of thing, but I know to be careful regarding the stored powerful current in the back of the unit.)

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  • 6 more comments 
  • snixter Mar 19, 2011

    Thank you for your response. However, my issue is not one of it not turning on -- it turns on easily every time. The problem is only the sound. While the TV was on and functioning properly, I was using the DVR to rewind, and after resuming "play" (live TV), there was no longer any sound. Changing channels, turning it on and off overnight -- nothing I do will bring back any sound whatsoever.

  • snixter Mar 19, 2011

    Unfortunately, the resetting and re-powering did not recover the audio. Any other ideas?

  • snixter Mar 20, 2011

    Hi. Thanks for your response. I connected a set of external speakers, but I only heard a thump sound from them when I first plugged them in. There is no audio whatsoever with the TV. Picture is fine, everything else functions as usual. (There was not even a faint thump sound from the TV speakers.)

  • snixter Mar 20, 2011

    Thank you. I will check for fuse issues tomorrow evening. (I will be tied up until then.) I'll report back to you late Sunday.

  • snixter Mar 20, 2011

    I tried adjusting the volume control on the external speakers, but that only adjusts the thump sound that comes out of the sub woofer when I turn it on. No audio comes out from any speakers.

  • snixter Mar 20, 2011

    I did all that previously (check the speaker "on" from the OSD menu). That was one of the first things I checked. And I have double checked it.

  • snixter Mar 21, 2011

    OK. Thanks!

  • snixter Mar 28, 2011

    The problem turned out to be a bad connection between the coaxial cable from the street going into the Cablevision box. (The communication between the box and the TV is via HDMI.) I tried connecting the TV to a different cable connection in a different room, and, lo and behold, the audio worked. I don't know why the only the sound malfunctioned (while the picture was fine), but that connection at the box turned out to be the problem. Thanks for all your help -- it may very well be useful in the future.

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2 Answers

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  • HP Master
  • 74,136 Answers

Hello
You haven't specified anything about its picture condition. Anyway, picture is correct, and only sound has probelm I assumes and answers. If picture is OK and oly sthere is no sound at all, check the speakers first. You can chek it without opening the TV. Place your ears very near to the speaker side of the TV, and switch it ON. if you can a "Thumb" sound [may be very small in amplitude]; speakers are OK; either the sound output section or sound detecting section inside the circuit bard is faulty. To confim which amoung this two is faulty, connect its audio output RCA sockets to any external audio equipment like amplifier or so, and check whether sound comes from it or not. If there is sound output through external amp and not with TV speakers, surely Audio Output Ic has the trouble and should be replaced with an identical type and number. If there is no sound from the amp also, that means the sound detection side circuits has got damaged. You must have experience and more skill to detect fault in this section. As you indicated that you have not much experience, leave it to any experienced technician to do. OK.

Posted on Mar 19, 2011

  • 5 more comments 
  • The Knight
    The Knight Mar 19, 2011

    Hello
    As far as picture is OK, there must be sound. You just check the process I described you early, and give me details by Fixya. OK.

  • The Knight
    The Knight Mar 20, 2011

    Hello
    I've placed a comment to you about 12 hours ago. You did't give me any information about it. I can't see anything about it in my window. whout checking it, and without post anything, what answer should I give to you? Please clarify the results of the thests which I've adviced you to do and what was the effect. OK.

  • The Knight
    The Knight Mar 20, 2011

    Hello
    I thinks that the comments you posts to me won't reach to me. Just do one thing. Send a mail to me and check whether your service providers server distributes it to worldwide or not. Send a mil to me at the folloing mail address of mine , and make confirm about the delivery. If you have any to report me, you can do it by mail also. OK.

  • The Knight
    The Knight Mar 20, 2011

    Hello
    Where do you post your comments? I can get its alerts, but nothing can be seen in my window. If you perists this fault, report it to Fixya. There may be some trouble with your site. Report it to them. Their engineers will rectify it. OK.

  • The Knight
    The Knight Mar 20, 2011

    I got one now. Check it connected with external speaker,a nd increase the volume of your external device you have connected with your TV and find whether it works fine or not. If it works fine, and there is no "Thumb' from TVs internal speakers, make sure that either the speakers of audio output IC inside your TV, or both of the are defective and shoul be replaced. OK.

  • The Knight
    The Knight Mar 20, 2011

    Hello
    Do one thing more.
    Are the TV speakers turned off in the onscreen display (OSD) menu?
    Press the Menu button to open the OSD. Press the down arrow button
    to select Audio, and then press the OK button; press the down
    arrow button to select Speaker, and press OK; press the down
    arrow to select On, and then press OK. Press the Menu button to
    close the OSD.

  • The Knight
    The Knight Mar 20, 2011

    Hello
    Audio detection section inside your HP tv has damaged. It should be replaced as card basis. Eventhough your TV is Branded as "HP", the actual circit board and other things inside are of "Sharp". Only brand name and appearance have been changed. You informed me that you haven't enough knowledge in electroncis, and havent got experience in repair. So it is best for you to leave this work to any experienced technician nearby you. It is a skilled work, and and some critical service adjustments should be done after service. Never attempt to repair it by yoursef, as it may damage more components. Audio detection cards are of may types, and you have to determine which type has to be used, and which type is used in your TV. OK

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  • HP Master
  • 1,591 Answers

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.

If you aren't tech savvy, this unit needs to go in for repair.

If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.

Posted on Mar 19, 2011

  • 1 more comment 
  • Norman Skinner
    Norman Skinner Mar 19, 2011

    Sorry, I must have been in a bit of a hurry at that moment but the idea was to show how to identify and replace bad capacitors.
    Lets do a reset on the unit
    Press menu
    Go to DEFAULT SETTINGS and press OK.
    Unplug and replug the unit into power
    See if audio has returned.

  • Norman Skinner
    Norman Skinner Mar 19, 2011

    Well, you already checked the mute and speakers on and we did the reset, so that should have taken care of SAP or anything like that...
    I'd take a look at the source itself. IE - if it's a sattelite receiver, is there sound coming OUT of the receiver INTO the TV...try a few different sources.
    If you still have no sound, then it's time to start looking for surface mount fuses. They can be white rectangular boxes, flat green tiny fuses or 0 ohm resistors.
    They may be in the power supply section of the TV or the audio section of the main board.

  • Norman Skinner
    Norman Skinner Mar 28, 2011

    Hope you had a chance to check on those fuses...you said you'd report back late Sunday, and it's now early Monday, so I was concerned that maybe you didn't have time to get to it.

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