Question about Sharp LC-37D4U 37 in. LCD Television

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No sound on Sharp Aquos 37' LC-37D4U

Several people I've seen here have posted the same exact problem...turn on TV, here small popping sound, NO SOUND comes from speakers. Sometimes it corrects itself by turning TV on and off again...mostly it doesn't work. I found a place to order parts, but I've no idea which sound parts to order, as there are around 6 or 7 of them. PLEASE HELP!!! Wow, look at all these people with the same problem from this TV. Unfortunately I am in the same boat as you folks! This is a beautiful TV with a great picture, but now at 3 years to the date, my sound has gone  out. I am a Union electrician and have troubleshot all possible options (cable box, remote functions, had cable tech come out to verify, and I have also verified that I can get sound from my cable box by hooking the TV up to my receiver and output audio to my stereo speakers - so it is the TV!) I am also experiencing intermittent power problems like others where the TV comes on all by itself.
I haven't even contacted Sharp yet because I can already see what a hassle it will be from the sound of everyone else. I will try this Monday. I am residing to just getting some self powered speakers for the set. At some point, I will open up the TV to see if I can diagnose audio problem.
Suffice it to say, I will never buy a Sharp product EVER again! I have the LC-37D4U
Maya

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  • bobjowill Feb 04, 2009

    I have the 32" Sharp and have had the same problem, including the popping sound as the TV is turned on, and the TV coming on by itself (sometimes in the middle of the night when we're asleep! We also had a technician from Comcast take a look at it. He changed the Output Select option from "Variable" to "Fixed". That seemed to work. That was a month and a half ago. However, just tonight (Feb. 3, 2009), the problem reoccurred but when we changed "Variable" to "Fixed" and visa versa, there was still no sound. Our TV is also about 3 years old. -Not a long time.

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Almost all intermittent audio or audio failure problems with Sharp Aquos LC**D4U, LC**D5U, LC**D6U, and LC**D7U televisions are the result of a relatively simple design flaw involving the heatsink pad compound used on the Tripath TA-2024 amplifier chip (IC2502) found on the A/V board. This compound has a fairly low melting point and, over time, tends to seep out from between both top and bottom heatsinks onto the legs of this chip as well as onto circuitry immediately surrounding it. Further, over time the seeping compound also becomes somewhat conductive creating bridges which short the audio amplifier circuit causing everything from intermittent audio to complete audio failure.

Fortunately, in almost every case audio can be completely restored by cleaning the old compound from both top/bottom heatsinks and from both sides of the PC board in the area immediately surrounding the chip (I used rubbing alcohol which worked quite well). Sharp has issued a service bulletin addressing this issue (LCDTV-194) wherein a ‘2502 Heat Kit’ is specified. This kit is Sharp Part Number: PSPKIT663WJZZ and is available from circuitcity.partsearch.com for $19.95. However, it’s entirely possible to get by with the heat pad only, Sharp Part Number: PSPAZA663WJKZ for only $9.95. Please note that board replacement for this problem is almost never necessary, so if you’re working with a repair technician be sure and insist that he/she be certain to try cleaning the old board and replacing the aforementioned heatsink pads before charging you for a new board.

If one is reasonably familiar with electronics disassembly/reassembly and is willing to take their time, this can even be a DIY project. It is possible to find ‘important service references’ by simply entering LC26D4U (the 5, 6, and 7 series are very similar, and this information covers all screen sizes) into the search field at eserviceinfo.com. This will greatly aid in disassembly/reassembly of the TV, as the A/V board is somewhat ‘buried’ under other boards. Please refer to post # 373 at avsforum.com/avs-vb/showthread.php?t=647174&page=13 for pics of the information detailed here.

Particular thanks are owed ‘Aureius’ of the AVS forums for his research efforts concerning this issue !

Posted on Jan 28, 2009

  • Gleg Assistance Jun 18, 2009

    I also wanted to mention that a couple of other very pesky common problems with these series of Sharp TV's involving symptoms of random powering-off and/or powering-on, and 'function lock-ups' of various sorts are easily remedied through two firmware updates (Main CPU: PH1UU112, Monitor: MD1UA104). These are not available to end-users via the internet but it may be possible to get the files from an understanding factory-authorized repair tech. They are installed using an SD memory card (don't use the HC high capacity sort, use only those that are NOT HC) which is inserted into a special slot in the back of the machine. For those of the DIY persuasion, information about how to check whether your TV has old firmware in need of an upgrade is readily available through internet search.

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Does this problem also exist on the LC-52D82U model?? My DVD input has no sound and my tv input has intermittent sound...

Posted on Nov 18, 2009

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