HOW DO I FIX MY JVC PLASMA TV THAT DISPLAYS PICTURE AS NEGETIVE (SEPIA)

Bulged Cap issue is to do with power sub-system and generally more in the LCD/LED tv not Plasma.

Begin from
42 Class 41 6 Diagonal Plasma HDTV with EZ Sync

Do you get blinking codes ?
Panasonic TH 42PX70 St By Light Flashes 10 Times
Not sure if it is the thermal fuse issue in your case though.
See How to Repair PANASONIC Plasma TV with Blinking LED TH 42PZ77U TH 42PZ700U

Unfortunately, there is no easy fix for this. If it were a rear projection TV, I'd suggest a new bulb. Even on a Plasma there are things that can be done. But on a CRT, the repair for a dark screen usually costs more than replacing it.

Loss of Luminance signal. Actually this fault is related with its main board. Contact any service technician.
Gopakumar Gopalan Google

This sounds like a bad cable or connection. Swap out the cable with a known working one and see if that helps. Next, wiggle the cable nearest to where it connects to each device and see if that recreates the issue. If so, your cable either has bad ends or your device has bad ports/connectors.

What is the color setting type PAL or NTSC most likely in wrong Setting for TV transmission in your country. Worth checking in settings.

if you want to fix the problem it needs trouble shooting and of course a digital multi meter. first you need to open the back cover, and then before you trouble just look the components first at the power supply, control board or at Y and Z sustain board if their are, burnt parts, blown fuse and also capacitor with bulged and leak on top of its casing.it will help you a lot to determine the exact problem.then your next step disconnect load side connector of the power supply to discharge excessive load voltage,then try connect all the connectors again and turn on the power, check output voltage at the power supply according to its label.then check all the supply going to Y and Z sustain board also observe if their is a indicator light at the control board.

I suspect that your supply has gone bad. You will need to find the service manual for voltage measurements. If you want to get replacement boards many can be found on ebay or you can check www.shopjimmy.com they stock boards for many units and I have had no problems.

Please try to reset it in service menu. If it doesn't help check scalar and components around it.

Display IC seems to have gone. It will be a replaceable module. Only you have to figure out which one it is. Such thing happen in electronics. Look for any burnt or bulged IC.

dds426's reply:

The problem was not a cable connection. A chip needed to be replaced at the tune of over $600j (includes $200 for the repairmen coming to my home to dismantle and take to the shop and return it).