Question about JVC LT-40X776 40 in. LCD HDTV

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The TV (JVC LT-40X776) has sound, but no picture. The cable company has come to the house and said that the problem is with the TV. The TV is only used for TV, no play station, etc. Is this a repairable problem? If so, is there an approximate repair cost? Thanks.

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6ya6ya
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Posted on Jan 02, 2017

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joeymille916
  • 143 Answers

SOURCE: JVC LT-40X776 will not turn on, electrical outlet

Probably an issue with the power supply. The TV circuitry is set to protect the components when something is broken. Sometimes, it can be the fuse on the power supply board, and sometimes the capacitors burn up. If the TV is under warranty, take it in for service. If it is not, you may try to fix it yourself by first checking the fuse and then checking the capacitors. If you aren't familiar with electronics, I suggest you let someone who is a professional look at it. Good luck!

Posted on Oct 09, 2010

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jdvillanueva
  • 2098 Answers

SOURCE: JVC TV, LT-26C31BJE Sound but no picture. Is it

Hi cross_keys,
Before thinking of a new set, try this first.

You may power on the unit in the dark room and directly shine the flashlight to the LCD monitor. You will barely see an image or picture because the fault is either the inverter board or the lamp (backlight). You may isolate the problem but it will require you some tools and test instruments. Also, you must know some basic safety precaution in electronics troubleshooting.

Best way to find the faulty parts between the two you need to test the output of the inverter board. You can do it using the voltmeter or if does not available you may substitute a two 12v car bulb in series to the output of the inverter board. Powering on the unit and look if the bulb will glow or not. Yes, your lamp was busted. No, the inverter board fail.

You may look online for the replacement of defective parts. http://shop.ebay.com/i.html?_nkw=LT-26C31BJE&_sacat=0&_odkw=42RV600E&_osacat=0&_trksid=p3286.c0.m270.l1313

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Posted on Mar 02, 2011

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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

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Check its back-light ivnerter board for fault. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

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1 Answer

JVC LT-40X776 will not turn on, electrical outlet is good, remote is good. If you unplug it and reconnect it, the TV will turn on for 1-5 seconds and then turn off by itself and then it will not turn on...


Probably an issue with the power supply. The TV circuitry is set to protect the components when something is broken. Sometimes, it can be the fuse on the power supply board, and sometimes the capacitors burn up. If the TV is under warranty, take it in for service. If it is not, you may try to fix it yourself by first checking the fuse and then checking the capacitors. If you aren't familiar with electronics, I suggest you let someone who is a professional look at it. Good luck!

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1 Answer

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Call the tv warrenty serviced repair,tv under a one old right?The tv power supply board is dead,need repairing by replacing power supply parts call like capacitors common parts dies by leaking gases in the power supply board.

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1. hold the [vol-] and [menu] button.
2. while holding those, press the [power] button and let go of the [power]button only
3. wait 5 seconds then let go of [vol-] and [menu]
4. wait for a while(approx 30secs).....do you get a picture

This works for the JVC models that end in "9" and end in "0"

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2 Answers

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Sorry, this has no easy fix. The good news is you do not need an LCD Panel. The bad news is the Video Processor has a problem.
This TV has x3 Boards. The one you should replace first is the one in the middle. If this doesn't fix it, try the one on the right. The Part #s are on the Boards if you wanna try ebay.

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1 Answer

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your backlight burnt out, this will be a maybe several hundred dollar repair. the screen is backilt by a very expensive flourescent light, without that light, the screen will be black.

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