Question about Sharp 40" Class 1080p 60Hz Slim LED HDTV - Black LC-40LE431U
Can't explain any further, loosing your TV's sound by 75% volume, something is wrong. I've other people look at this TV, it is not the controls.
Posted by Anonymous on
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Posted on Jan 02, 2017
This unit has a chronic problem with the insulator material used on the heat sink on the ic's on the AV Bd. The unit must be disassembled and the AV bd. removed. The insulation on especially IC 2502 breaks down and must be cleaned off of the bd. and the ic and new insulator part # PSPAZA663WJKZ must be ordered and used as the insulator pad. If you send me an email to firstname.lastname@example.org I can send you the copy of the Sharp technical bulletin LCDTV-194.
Posted on Feb 26, 2008
User 'rapolley' is absolutely right. One can cycle through the functions to access different options, ie. 'TV', 'Audio', 'DVD', etc. I stumbled upon this solution when I thought my 'Menu' button wasn't working. All I had to do is cycle through the 'Functions' and choose 'Menu' once I get to 'TV'. Thanks!
Posted on Mar 19, 2008
SOURCE: sharp aquos fault
Thanks to this forum, I was able to confidently contact Sharp and get my TV fixed.
My 32" LCD had the same problem (sound but no picture) and was out of warranty, however I phoned Sharp UK and suggested that it was a manufacturing defect rather than component failure and should be repaired free of charge - which they did!!
Posted on Mar 19, 2008
SOURCE: Sharp TV Audio Problem
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
GOOD NEWS - - According to the Sharp Technician I just spoke with a "Service Bulletin" went out to all their techs about the sound issue on these Sharp Aquos. I'm having the exact same sound probem and I'm in the process of having the technician come out at no charge so call the number given in Solution #6 and #9 (1-800-237-4277) and keep pressing #1 until you get a technician. Have your serial number ready and they will need your name, address and telephone #. They will then give you a case number and transfer you to dispatch (which closes at 5pm central). Thanks everyone for your help and posts - you made our day!!!
BTW - We also have the problem of the TV turning on and off by itself but the technician said they had not received a service bulletin about that yet.
Posted on Jul 07, 2009
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