Question about JVC LT-42X688 42 in. LCD HDTV

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JVC LCD TV (LT-42X688) input panel not working!

I have a JVC LCD TV (model LT-42X688)and the rear input panel is no longer working!
I am able to watch TV through my digital cable box using HDMI cable, however I have no sound through the TV speakers. I am using my stereo speakers for sound.
No DVD, no Wii, nothing through analog - HELP!
Has anyone else had this issue? I am not a "tech genius", but like to think I'm ok.
The TV is 6 months past the 1-year warranty.

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  • 105 Answers

1. This TV has setting for the HDMI input that allows you to select the HDMI Audio or Analog(red/white wire) audio. Make sure this is correct

2. Most cable boxes are DVI not HDMI. If DVI then you actually do need to use those Red/white cables. If HDMI, refer back to #1.

3. The cable box has a setting to select the Audio output, HDMI (digital) or Analog(red/white cables). Just like #1, this has to be set.

4. Contact your cable company to help you set up the box correctly. JVC can probably help you check the TV

Posted on May 21, 2009

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  • 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

  • 105 Answers

SOURCE: I have a JVC LCD

You need an Analog Board. It is the one in the middle. You can find it on ebay for $50 I think.

Posted on May 21, 2009

  • 1 Answer

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

Hi , I have the same problem with my LT-42X688,so i called the service of my extended warranty provider . the TV technician just left and told me the motherboard is the problem. he said its the third one this week he has seen with the same symptoms. he ordered the motherboard and i've got to wait 5 to 7 work days before the part will be in . I will keep you posted when the guy will return.

Posted on Jul 21, 2009

  • 1 Answer

SOURCE: Connecting Nintendo Wii to JVC television

every time im using my wii in my jvc tv i keep clicking channel the when i click the tv button on the rca remote then a code. i keep forgething the code

Posted on Dec 12, 2010

  • 8457 Answers

SOURCE: JVC LCD Model LT-32X576, The HDMI Input does not

All LCD tvs HDMI cables support both video and audio.Tries another HDMI cable or tries another HDMI hub port on the tv.

Posted on Jun 09, 2011

TODDAS
  • 431 Answers

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

bad main logic pcb

Posted on Oct 08, 2011

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1. check the input that the PS3 is connected to
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My guess is that you don't have the HDMI setting correct on the PS3.

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Have you tried the "Aspect" button below the menu keys of the remote? Try "Full" Aspect and see if this improves things for you.

Hope this helps.

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2 Answers

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


Hi , I have the same problem with my LT-42X688,so i called the service of my extended warranty provider . the TV technician just left and told me the motherboard is the problem. he said its the third one this week he has seen with the same symptoms. he ordered the motherboard and i've got to wait 5 to 7 work days before the part will be in . I will keep you posted when the guy will return.

Jan 02, 2009 | JVC LT-42X688 42 in. LCD HDTV

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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