JVC LT-42X688 42 in. LCD HDTV - Answered Questions & Fixed issues

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/

Hi go to input on your remote, click and find the HDMI box and click on that. Then you should be in contact. kolbrun

Speaking from experience it's a bad idea. Don't bother, just get a new TV.If they are cheap here in USA now they should be even cheaper in Dubai.

Assuming this is the same as my jvc 42x788 the small t-con board is near the top of the tv. It's behind the main panel that the other boards are mounted to. You don't have to take that main panel completely off, just take enough screws out to pull it out far enough to reach the t-con board. Also watch for any wires that need to be unplugged to get more room pulling the top of the panel out.

The 5vdc standby is working but not he rest of the power supply, this can be due to bad power supply, main board, backlight inverter board.
Please read my guide to understand what to look for inside.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Basic LCD monitor and TV troubleshooting guide: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps. Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series. Please post back what you find.

INPUT:
Selects the signal input source for the television: VIDEO-1, 2, 3, 4 or 5 for video devices like
VCRs, DVD players, or camcorders.
Press the V1, V2, V3, V4 or V5 button
Notes:
• When you return to TV mode, press the RETURN+/TV button or direct 10 key pad or CHANNEL
+/- button.
• You can also access by pressing the INPUT button on the side of the TV instead of the remote.
This was taken directly from the manual which you can download and view here:
http://resources.jvc.com/Resources/00/00/92/YA535ien.pdf
Thank you and enjoy,
Lee

Hi.

To start, this TV should not require service remote to access service menu or adjustment menu.

In service menu also there is not a single reset option, but the technician must set the values one at the time.

About the part purchased, I could not find any JVC 87274RS remote control. Please check the number, include any dash or spaces, and include any info you have on the part, so that we can spread light on this.

About the problem it does not sound like something that "just need a reset" it looks like HDMI port is defective, and you should be entitled to get a technician at home if the unit is still in warranty (check it out).

Here how to get in service mode. You use the standard remote. Do not change values in service mode or you can damage the TV:



I uploaded here a service manual for the 40'' of same chassis.I do not have the 42''. Service mode, most parts and functions are the same. Panel size and frame are different.

Regards.

Ginko.

Inspect the fuse, caps, etc in the power supply module first.
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 http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/ Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps. Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Unplug it for about an hour to let it reset itself, if it still does not work, then you will have to do further troubleshooting inside. Right now only the 5vdc standby circuit is working.
If you are going to DIY and have proper tools, knowledge of electronics 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

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Power supply board is dead.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.The power supply board,that the board where the power a/c cord plug into it.

That HD mode.That good what else do u want.Unplug,replug the tv an hour later,might get HDMI ports work again.Not,ur Tuner board is dead.

Ur LCD inverter board is dead.Replaced this inverter board,u will get the picture back.Tries Websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.It a long shape board.

http://www.lcdtvbuyingguide.com/lcdtvreviews/jvc_32_lcd_review.shtml
http://reviews.cnet.com/flat-panel-tvs/jvc-lt-47x788/4505-6482_7-32486127.html

see the above review seems a worth buying product ....

you dont have it on the right setting then

For turned OFF enter in the set menu select the sleeper time(15-30...minutes).
For set the turn ON if you do not have the good signal it is imposibile.

I had the same problem on mine. It is a factory defect. It means your HD box that controls HDMI, USB, and RED GREEN BLUE component. Usually the red, green, blue, (720 HD) component is still functional, but the HDMI and USB are shot and can only be replaced not repaired. If your warranty is still valid and you have your receipt call JVC and they will give you the number to a certified warranty repairman. If you do not have the receipt they will not fix it. If you do not have the warranty and decide to repair it yourself or send it out, the fix is not difficult but it is costly. The box is about $1000.00 and the labor varies. The last option is to sell it for parts. If you decide to do this I will purchase the broken television from you. But if you have your warranty info there is nothing to worry about.

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.

Press the "Display" Button. It is the 3rd button up from the bottom on the right.

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.

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