For a Plasma or a LCD a cracked screen is the end of the set.In Plasma sets the "panel" or Plasma Display Panel the cost of the part is as much and usually more than the set cost new.Time for a new set and some major stores at purchase also offer insurance policy for this kind of event.
You need an adapter and the bestis to approach the nearest computer accessories store where such ones are available to which the conversion cord you bought can be used.Please check this interesting utube presentation;
the capacitors seem to have gone bad if they have like a black dot on them it is a sign they have actually blown they can be replaced by placing new ones on but it would be better if the board was replaced (unless you wish to replace those capacitors please please do be careful in doing so they hold enough charge to give you a bad zap even kill if one isnt careful)
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. 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/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset 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; visit the site linked here. ..
Check and replace the damaged component/s at its main board. Contact any service technician. 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/
Have you checked the sustain board/s. If you wish to get some details about how to check a plasma TV, visit the site linked here. It has details with illustrations. The shown is for an LG brand plasma, but all the plasma TVs will have same configuration and checking procedure, irrespective of its brand and screen size.
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/
Check and replace the damaged component/s at its main power regulator board [SMPS]; or, replace this board as card basis. Contact any service technician. After replacement, the should be some voltage adjustments to be done to Plasma TVs.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience.
http://electronicshelponline.blogspot.com/ Pull up older posts there.