Samsung 50" Plasma TV no response to remote ctrl & buttons

Chances are you have a stuck button on the button cluster, what I'd do is remove the connector going to it and use the remote control, with a stuck button the remote won't function properly.

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Remote Control Codes

support-us.samsung.com/.../pop_troubleshooting_fr...

Samsung ElectronicsAug 11, 2011 - ... all televisions. If you encounter problems, use the television's ownremote control. ... While the television is on, press and hold the TV Power button and enter the corresponding two-digit code. ... SAMSUNG ... EMERSON. 64.

Remote Control Code List

www.jumboremotecontrol.com/remote_control_code_list.html
... codes for the remote. If you do not see your device listed, you can use the codesearch feature to program the device into the remote. TV Codes TV Code List ...EMERSON ... SAMSUNG, 004,005,009,015,104,105,106,109,172. SAMSUX ...‎Guide to Programming the ... - ‎Download the Manual - ‎8 Device Learning Jumbo ...

Remotes - Device Codes - HiFi Remote

www.hifi-remote.com/codes-tv.shtml
TYPE, BRAND, CODES ... TV, Emerson, 0463, 0236, 0019, 0180, 0280, 0179, 0154, 0177, 0178, 0038, ... TV, Samsung, 0019, 0060, 0030, 0056, 0178, 0032.

Check the remote control for its infrared emission first. If it found OK, check and replace the remote sensor inside the TV. To get more details, http://electronicshelponline.blogspot.com/ Testing procedure to remote control is given in detail.
Remote sensor will look like this.

Blinking of the power button denotes an internal circuit fault. If you wish to get more about the blinking codes to Samsung TVs, check this link. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option

To set up the volume control on your Telewest remote control, to be able to change the TV volume, please follow the instructions below.
1. Using the table below find your make of TV and the code which matches it.
2. Press and hold down Volume + and mute on your remote control at the same time for at least three seconds, until the green light in the top right-hand corner of your remote control flashes twice.
3. Release the buttons and enter the first four digit code from the table below. (You must do this within ten seconds).
4. As you enter the first three digits the green light on your remote control will give a short blink.
5. As you enter the fourth digit, the green light will flash twice to confirm that the volume is set.
If setting the volume is not successful, please repeat the above steps with the second or third codes from the table below.
Samsung 0065, 0584, 0037

I have a 5 years old TH-50PX500U Panasonic Plasma TV that has almost similar problem as yours. At times, the response on both TV buttons and remote control is very slow or no response at all. I am pretty sure that this is a defect in the TV control circuit. I am still searching for answer to this problem.

This may sound silly but does the remote have a funtion button or buttons at the top of the remote? It may be set to operate a DVD or VCR instead of the TV.

Failing that check the batteries, it is very rate that your TV will stop accepting IR signals.

Hope this helps,

Cheers

your turning section is not responding to any input, hence needs to be checked by a technician. every thing you have mentioned are controlled by one ic, with its respective voltages.

Sounds like power supply switch needs to be changed to normal setting. If you are comfortable with electronics i will talk you through it if not you will need a tech or back to cosco it goes if you have a warranty.