can be a few things but most people claim the power supply unit is at fult, here
POWER SUPPLY UNIT QAL0756-001 JVC LT-26X506 usually that part will correct most issues with these TV's i ordered one for my client, i am a computer specialist but i work with almost every type of monitor/ system out their myself, and this is often a isue after a year or 2 with these. good luck.
Do you get good audio from the headphone jack?
If yes, then it is the Audio Amp or some component in the Audio Circuit
If NO, then then Audio Switching IC is defective.
Expeens will depend on the person fixing it. expect $70-100 parts. I think labor is normally $80-120. so $150-220 total.
You can get a new 26" for that though. If the headphone works then the Audio Out of the TV will work. I suggest a miini system for audio out.
it needs service, that means using tools and meters and spare parts to find cause.
dead screen black screened at all times.?
even in HD TV antenna mode for HD TV?
or just the remote CLICKER batteries dead.
tell things that work and no not work , even LED actions.
the maker has no books on this old TV
https://jvcproducts.com/us/contact/support.html
here they are ask them>?
what rare TV. good luck fixing any RARE TV.
moved you to TELEVISION.
Return it to your place of purchase and get something else anything else you wouldn't believe how many people are having Issues with the LT series get rid of it.
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://electro-medical.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)
As a first step , if it is controlled via the remote, check that the remote batteries are good and that it is functioning ok. Does the tv show anything att all? If it does come on but shows nothing then it might be that the source selection is on the wrong kind of source, you can find on the remote whether this is so by going to the source menu which should probably be on digital. (I am assuming that you only have digital broadcasts where you are.
If there is no picture whatsoever ubplug the set and check whether the internal fuse(s) are ok.)