Ps50700 power lihht blinks 4 times won't turn on

power will not come on Linda, could be bad capacitors or cracked/bad solder joint,bad main logic board.
Check the attached links,instruction and guides, Good luck
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4 blinks Power SOS P Board.

Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. There are more than 1000 posts to different brand TVs now. Pull up older posts there.

It looks like your laptop is in standby.
Try pressing power button.or
CTRL-ALT-DELETE- at the same time.
This should reboot your computer.
Failing this:
Remove power.
Remove battery.
Reconnect power.
Turn on.

Do the self check when power light goes off.

On front of set press and hold both the menu and input buttons for 5 seconds or longer and release both buttons.

Power light will blink a error code like: 2 blinks, 2 blinks, a pause and repeat about 4 more times.

Let me know what error code you find and I will tell you what it means.

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SD TECH

I could be anything but mostly it will be its age, and if its never been cleaned out it could be the bulb failed, power board. dust build up can cause over heating of the parts. even damage them if the dust becomes damp. is there any lights flashing or any leds lite up ?

sounds like i lamp problem but not 100%

The PS50700 uses the PTK195 series chassis. You can switch the TV to the video mode by pressing MENU, press channel down 3 times to highlight "4 Channel", press MENU, press channel down twice to highlight "3 List and Labels", and then press MENU. The current channel will be highlighted, and you will press channel down until you go below channel 1, which is where the video inputs are (VID1, VID2, FRNT). To exit, press MENU, choose "Exit", press MENU and choose "Exit" again, or just wait until the menu times out. An easier way is to get a universal remote that has an "INPUT" button.

what chassis is in your set,look at the rear panel for model and chasis type to help to diagnose fault

The PS50700 uses the 195 series chassis. The most common cause of the set not starting up is a shorted flyback (high voltage) transformer. Sometimes a shorted flyback will also cause the horizontal output transistor to short too. These parts need to be tested and/or replaced by a tech familiar with the RCA 195 chassis.