The main power supply regulator section circuit fault. 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. 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.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
SOURCE: Newer Jvc tv wont turn on
1. hold the [vol-] and [menu] button.
2. while holding those, press the [power] button and let go of the [power]button only
3. wait 5 seconds then let go of [vol-] and [menu]
4. wait for a while(approx 30secs).....do you get a picture
This works for the JVC models that end in "9" and end in "0"
SOURCE: TV pictures can't come out
www.rolsen.ru/content/tech/PDH4239EU_service_manual%20V1.0.pdf
www.rolsen.ru/.../PDP32XX%20Service%20Manual%200804301.pdf
use these service and repair manuals, to troubleshooting procedures.
Testimonial: "Very helpful"
SOURCE: I have a panasonic 50 inch plasma th-50pz80u.
try to check power supply look for swollen capacitor it is the common trouble of plasma and lcd.
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