I have a PN50A550 plasma tv and it will not turn back on. All other devices plugged into the surge are working just fine. My roommates were watching it today and it just went black out of no where. What can I do? All internal parts on the tv were replaced 3 months ago.

Generally, any horizontal or Vertical line appearing on the TV screen indicates a faulty circuit. The complex circuit boards can become faulty from age, overheating, or a power surge. Power surges do the most damage, thus it is advisable to always plug the electronics (TV, Computer, etc) into a Back Up Power Supply (UPS) for protection. Naturally the Power Back Up must be relative to the Wattage of the electronic device. Like 1000 Watt for a TV.
As for the Circuit Boards, a technician with test equipment needs to check out what component needs replacing.

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

Just check whether the mute button on remote is jammed. Then if that is ok, check whether you can listen to the sound on a Head Phone connected to the TV. Even if it works, the TV needs attention by a qualified service technician.

Unplug the TV from AC mains wall socket. Plug it back after 5 minutes or so. this must make the TV to a hard reset. Try this.

usually this is a fault with the power supply in the tv. the capacators only hold enough charge to turn on the tv but not maintain the proper current to keep it on. contact a repair technition or the manufacturer.

Inpsect the power supply caps for bulging/leaking tops first, also chek the caps on the sustain boards.
Post back what you find.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

hi i have replaced power controls boards in more than a few of these & this needs to b done by a expert .

Hi there..

you just need a 3.5mm standard audio cable, from the green audio port out the back of the computer to the audio in port in the TV :)

can get them from ebay for 99p :)

hope this helps

alex

that's a firmware problem where your tv's firmware does not handshake with your dvd's firmware. This could be from your dvd's software being to old for your tv to understand it. HDMI (TDMS Technology) still has Alot of catching up too do with 3rd generation tv's. Alot of HDMI devices still have the first gen software loaded into them. So a tv after 2005 won't work with HDMI from 2003 (1st gen). Most tv's made after 2007 have software that's "backward compatible" so they will work with first gen HDMI.

How does your tv perform outside this problem???

It related with Power Board(50%) or Y-Main(50%).
But, if you use the power bar with surge protacton, need to check
the power bar's lamp when the TV is turning on & off.