If you wish to get some details; visit the site linked here. Pull up older posts.
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts
Plasma TV's are notorious for power supply problems, its most likely failing capacitors in the power supply. If you can find a repair shop i would take it in, otherwise you might also be able to find a replacement power supply board online, but its a crapshoot to find a good one so its better to try and repair/rebuild the one you have. If all else fails its just time for a new TV. It sucks, i know, but i see so many 2-3 year old TV's failing its like a plague of the repair shop.
I have seen similar problems (features?) with Syntax LCD TVs. One thing to try is to make sure that the backlight brightness is set to its highest setting. On my Syntax, when this is set to a darker setting, it produces annoying hum through the speakers. Mine also is smart about turning *off* the audio amplifier when set to zero (or mute), which sounds like the behavior you are describing.
Check the remote control for its infrared emission. Check it with fresh batteries. Check it by pressing all the keys. You can detect the presence of infra-red emission from the remote control, using a cell-phone camera. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. Surf the site with patience. In some cases, the remote control might need to clean. http://remotesearch.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly. https://www.youtube.com/watch?v=jsSCNCW3IbQ [open and clean] https://www.youtube.com/watch?v=Qp-l1uh-5gE [open and clean]
If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand. They can either give you a genuine remote control to your device, or can direct you, from where can you purchase a suitable one.
To select a proper universal remote control, you should know about the number of digits to its set-up codes. There are 3 digit, 4 digit, 5 digit, 2 digit and even single digit codes, to some brand devices. After confirming this, check the sites linked here. Both the sites have set-up code list and set-up procedure to many popular brand remote controls. Check which brand remote control has set-up code/s to your device brand, and buy that one according to availability. Brand name of the remote control isn't a matter, but it should have set-up codes in its code list, to the device brand you have.
Please note: Every new universal remote control will have set-up code list, and set-up procedure along with its pack. Never accept a remote control, that hasn't both of this. For more details about the set-up codes, visit the sites. http://electrohelponline.blogspot.com/
Universal remote controls are available at most of the electronic spare part selling shops. Visit some on-line sites too, which deals with electronic spare parts.
These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
It sounds not a switch fault. It should be the fault with its main power supply regulator board itself. Its start voltage will not be proper. Contact any service technician. 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. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
You haven't provided enough details about the line you see. Is it a vertical line or horizontal? If
you wish to get some details, check this link.
http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
/ Timeslide / Flipcard, can be
selected by the drop-down list, at the top left of the display window,
will make surf easy. You can also do a
search, by type in the brand name / model number / IC used, in the
search box at the top right of the display window. Screen display problems to plasma displays are given in detail with illustrations. You can compare it to that of your TVs' screen and can get an idea about the fault. In most cases, if you're sound in electronics, you can do the repair by yourself.
Ten years is two lifetimes for a Plasma, it most likely is either the display panel itself or a main board, in either case not cost effective to repair or smart but the real problem would be parts, I bet almost zero is available for this.