Panasonic Plasma TC-P42C1 10 light blink code, then the light came on and then no light at all-nothing! Power Suppy board?

A 10 blink code on a Panasonic plasma TV typically indicates an issue with the power supply board. You will need to consult the service manual or contact a qualified technician to identify the exact part that needs to be replaced.

According to page 13 of https://www.manualslib.com/manual/421925/Panasonic-Tc-P42c1-41-6-Plasma-Tv.html?page=13#manual it indicates 5 Volt SOS.

Service manual seems to have detailed instructions if you feel handy to open it up.

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/

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

Depend flashing code ,
7 blinks Sc board bad
10 blink power board bad

10 blinks power supply board defective

Unfortunately the set will need serviced. I would contact Panasonic or whoever you purchased it from for warranty information.

Here is the link to the manual for the TC-P42C1 Panasonic tv.

http://service.us.panasonic.com/OPERMANPDF/TCP42C1.pdf

I hope this helps you. Bobya.