Question about JVC LT-42X788 42 in. LCD HDTV

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I turn on my lcd jvc tv, there is sound but no picture

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I have this same problem, any idea what the problem was?

Posted on Nov 17, 2009

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

budmrtn
  • 11361 Answers

SOURCE: I have a JVC 47" LCD Tv turned it on today no

First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there are some troubleshoot you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

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Posted on Aug 12, 2010

  • 105 Answers

SOURCE: JVC LT 42x688 no picture just sound

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.

Posted on May 06, 2009

SOURCE: lcd tv no picture

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Posted on Jan 07, 2008

  • 60 Answers

SOURCE: Turn on JVC 32

There is a way to reset television. I have a jvc 42inch that was just going to main logo screen and not beyond it. If i remember correctly you unplug the tv hold power button for 5 sec on tv then let go plug in and start. If that dont work unplug and then plug and hold power button on tv for 5 sec. It is 1 of those combinations. My tv worked after that. I googled my problem and a website listed that some tvs need to be reset.

Posted on Aug 16, 2009

  • 3 Answers

SOURCE: i have the same problem with my tv.

take back off lie flat

where the hd leads go into that board remove the screws at the top and bottom as its one long unit top to bottom
unscrew metal shield as well

remove all cables from board 2 ribbons are locked and require clipping down then ribbon removes
flip board over remove metal can to expose board notice 2 TSOP chips at top look att the pins one should look dull and not shiny

to fix i used heatgun a quick blast on pins sorted problem out

mask off board and chip around with metal etc... to not damage board.

Posted on Nov 15, 2009

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My JVC TV turns on and then off in 5 seconds.


Check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Jun 15, 2015 | JVC LT-42X688 42 in. LCD HDTV

1 Answer

JVC tv sound but no picture


It could be a main board, but it could be a backlight problem. To verify this, turn on the set, dim the lights in the room, shine a bright flashlight on the screen. If you see a faint picture, you have a backlight problem.

Jan 09, 2013 | JVC LT-52X579 52 in. LCD TV

1 Answer

CAfter the JVC model LT-42E910 is on for 10 minutes, the picture goes blank/black, but I have sound. I must turn off the tv and turn it back on every 5 minutes to get a picture. The tv is 4 days old.


It is a new tv.Take it back where u bought it and trade it in for another tv.This tv have those 2 LCD long inverter boards have problems.These 2 long LCD inverter boards are to help the tv LCD screen panel to have a backlight for the tv LCD screen to produced a picture.

Jul 07, 2011 | JVC LT-42E910 42" LCD TV

1 Answer

My 52 in jvc model lt-52x579 turns on but there is no picture or sound and about two seconds later the led light for the power starts to blink i tried to turn it off but it just keeps on trying to turn on...


Sound like the power supply board has gone out .Unplug the tv for 2 or 3 minutes and plug it in again and try to turn on. Some times they will come on .But It sounds like the PSB is going out .

Feb 14, 2011 | JVC LT-52X579 52 in. LCD TV

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JVC everio 20gb HDD will only show a blank white screen when turned on. Do I need to reload the firmware, or is this beyond?


Sounds like a bad lcd panel. Does the camera show a picture when connected to the tv? If it has a picture on the tv and not on the camera itself its definitely gonna be in the lcd panel or lcd panel cable area, and yes it can be fixed and worth it. I hope this helps

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Turn on JVC 32" flat screen TV and got the JVC logo then sound and no picture. Then next day, only got the logo, no sound or picture.


There is a way to reset television. I have a jvc 42inch that was just going to main logo screen and not beyond it. If i remember correctly you unplug the tv hold power button for 5 sec on tv then let go plug in and start. If that dont work unplug and then plug and hold power button on tv for 5 sec. It is 1 of those combinations. My tv worked after that. I googled my problem and a website listed that some tvs need to be reset.

Aug 16, 2009 | JVC LT-32X787 32 in. LCD Television

2 Answers

JVC LCD TV LT-42X688-powers on, blank screen. no picture,no sound


You most definately have bad capacitors in the power supply. try and get it repaired as soon as possible, not an expensive repair that iv'e seen.

Feb 04, 2009 | JVC LT-32P679 32 in. LCD TV

2 Answers

JVC LT 42x688 no picture just sound


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.

Dec 22, 2008 | JVC LT-40X776 40 in. LCD HDTV

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