JVC LT-42X579 42 in. LCD TV - Answered Questions & Fixed issues

Horizontal lines are usually caused by a bad LCD (screen)..

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

There are two types of reset to TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. 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/ Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done. Do a hard reset, and check.

Without a remote control, you can't unlock it. If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand. They can either give you a genuine remote control to your device, or can direct you, from where can you purchase a suitable one. To select a proper universal remote control, you should know about the number of digits to its set-up codes. There are 3 digit, 4 digit, 5 digit, 2 digit and even single digit codes, to some brand devices. After confirming this, check the sites linked here. Both the sites have set-up code list and set-up procedure to many popular brand remote controls. Check which brand remote control has set-up code/s to your device brand, and buy that one according to availability. Brand name of the remote control isn't a matter, but it should have set-up codes in its code list, to the device brand you have. Please note: Every new universal remote control will have set-up code list, and set-up procedure along with its pack. Never accept a remote control, that hasn't both of this. For more details about the set-up codes, visit the site http://electrohelponline.blogspot.com/ Check this site too. http://remotesearch.blogspot.com/ Universal remote controls are available at most of the electronic spare part selling shops. Type in the brand name of your device, in the search box [at the top right] of the display window, and press enter to get all related posts. It will make surf easy.

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/ Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

No. It has no such battery inside. Its memory IC is non-volatile type, and need no back-up electric charge to retain the data, even after it is switched OFF. http://electronicshelponline.blogspot.com/

The number of the memory IC will be printed on it. Usually, it will be in laser printing. When replace it, be sure to replace with exact number printed on it; otherwise, it won't work. Will look somewhat like this. May be a DIL type or an SMD type. http://electronicshelponline.blogspot.com/

go to roku.com and wartch the video.lol.

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/ Line, faults & possible causes to LCD screen are given with illustrations.

hi hello there yes I think I can help you out here, the same thing went wrong with my fathers TV. and it turns out that its the capacitors in the circuit board of the TV. now then you need to open up the back of the TV, its really quite easy. all you do it when the back is off the TV look at the tops of the capacitors the good one that work will look and feel as flat as a pancake, the ones that are broken and nee replaced have a either slight bulge or have burst wide open you cant miss them they stick out like a sore thumb most of them. you need to heat up a soldering iron and carefully heat up the bottom of the capacitor so that the silver on the back of the circuit board melt and then pull out the capacitor. go to maplins and get a replacement for the ones that are broken. and replace them the very same way you took out the broken ones. do a good job on soldering them back in exactly and I mean exactly the same way they came out. make a note even draw it down the way they were before you take them out. that will fix your tv good luck

A converter box is necessary to pick up digital signals. Gopakumar Gopalan Google

Sounds like main board fault. Contact any service technician. Gopakumar Gopalan Google

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power led, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating, to many popular brand TVs and other devices. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/ Blinking codes details to many popular brand TVs are given. Surf the site with patience.

how do i change to av mode?

hi austen yes i know what the problem here is. i am quite sure its the capacitors in the tv. they are realy easy to find and to change your self. a blown capacitor will be easy to notice it will have a risen dome like appearence on the top of it, there'll be lots of these capacitors in the back .so just look for the ones that arnt perfectly flat. and then solder the old ones out and replace by soldering the new ones in. just make real sure the new ones go in the way they came out .....good luck ian

These blinks are fault indications. Count the number of blinks occur at one time switch ON. From the number of these blinks, you can get an idea about the faulty circuit side in the TV. You must have some knowledge in electronics to follow. If you have confidence, check the link. It has details about the blinking codes to JVC TVs. http://electronicshelponline.blogspot.com/ Make sure about the number of blinks, before you proceed. Switch the TV On and OFF for at least two times to make it confirm. Pull up older posts by that site, by its left sidebar.

i would recon that is an issue with the sound settings,or maybe 1 speaker is blown?you can change the sound to personalize the way you wish the sound to be,can you reset this to default?listen if sound i coming out both speakers,also do you have surround sound? check all your settings

Sounds like the inverter if the audio still works if the audio goes out too then the main board would be suspect. The people over at www.tvrepairworld.com can help you determine which board is causing it and they also have the replacement boards available.

Its not making it out of standby, you could if can safely get it apart (ask if in doubt) inspect the power supply board for damage or puffed up filter caps, then consider having a shop look it over--All makers only sell circuit boards and no individual parts.