A JVC LT42XM48 LCD Television set. Takes power has no picture or sound.

Google

JVC (model) manual

and set it up again. The problem must be the sound bar settings not the television settings, UNLESS you reset it via the television.

https://www.google.com/search?q=how+to+set+up+jvc+soundbar+to+tv

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Check and replace its back-light inverter board. Contact any service technician. Gopakumar Gopalan Google

YOU NEED A NEW HALOGEN OR WHAT EVER KIND IT TAKES. THE COMPARTMENT FOR THE BULB SHOULD BE ON THE REAR ELECTRIC PANEL MARKED BY FOUR SCREWS IN A SQUAR REMOVE THEM TO REVEAL BULB. THEN GO ONLINE TO MANUFACTURER AND ORDER NEW ONE

The problem is usually from the power or the Y sustain at the left or right side of the display when one of the large capacitor or heat sync on the capacitor even the flat power cable connection it to a main power board needs to be checked too, if the fuses on the board are blown it will need to be replaced

But after replacingthe fuses and the capacitors and still no solution,youwill need to replace the all board ..

You can also trouble shoot first before going to the board of the TV..

How to Troubleshoot an LCD With Sound But No Picture


It can be overwhelmingly frustrating when an electronic device as expensive as an LCD television set starts having problems. Luckily many of these problems are easily troubleshot. While being able to hear sound coming from your LCD television but seeing no picture may seem serious on the surface, fixing the problem involves checking a few different settings to make sure everything is set properly


Instructions



Check the video connection of any devices plugged into the LCD television. If you can hear sound but are seeing no picture while trying to use something like a DVD player or cable box, the problem is probably that a wire is loose somewhere. Check the yellow video cables running from the DVD player to the TV and make sure everything is plugged in firmly and where it should be. Also check the coaxial cable running from the cable box (or cable outlet) to the television and make sure that wire is also screwed in securely.

Check the image settings on your television and make sure everything is set properly. Certain settings like "Picture" or "Brightness," if set to one extreme, can make the picture appear completely black. This could cause you to simply hear television shows but not be able to see them. Reset all picture settings on the TV to their original factory default settings to see if that fixes the problem.


Try another channel. If you're watching TV and not getting a picture, the first thing you should do is check a variety of random channels to make sure it is a problem with your TV and not with your television signal. If it is a problem with the television signal it is the fault of the TV station or cable service provider and there isn't anything you can do yourself to fix it.


Try the DVD on another DVD player. If you're trying to play a DVD and can't see any images, make sure the disc isn't defective. Try it on another DVD player or a computer DVD drive and make sure the disc works in the first place.

Hope it helped ..

Well it takes a good Y and Z to make a good picture.

Slow turn-on sounds like power supply problem to me, although I've worked more on LCD sets than plasma, so I could be wrong.

Here's an ebay link that tells how to test your Z, and coincidentally has a Z board for sale.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=350088827899

some stores have a limit on the returns of 8 to 6 months to a year check out where you bought the set from, GOOD LUCK!!!
techman

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.

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.

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.

Hello,
Please call me 323-767-6030 and I will go through with you.