Posting my repair for the edification of the group... a lot of this isn't new information, but I wanted to summarize in hopes that it will help someone else.
I have a 13th Generation Panasonic Plasma TV, model TC-P50G20 Mfg Date: Nov-2010
A few nights ago, while watching something, the set just shut down and the red power led started blinking. 10 blinks...
OK, at this point, I know nothing, so I turned to the Web for information, of which there is plenty.
I found that if I unplugged the set and plugged it back in I could hear relay clicks:
Plug in -- two relay clicks almost immediately
pause ~15 seconds
two more relay clicks
(This is a normal pattern so far for a working set as well)
Hit the power switch -- two relay clicks almost immediately
short pause 1-3 seconds
two more relay clicks, (power off)
4 blink pattern on red power led
If I hit the power switch during the initial 15 second delay during the initial pre-powerup I would get the 10 blink pattern again.
The AVS Forum, showed up in a lot of my searches, but there are SO many postings about all the different models of Panasonic that it was a little confusing, because each generation of set ends up having slightly different codes and diagnostic trees.
This thread on another forum http://www.badcaps.net/forum/showthread.php?t=20915&page=4
(posting #63) got me real close to my answer that my SC board was the issue. In it, Tom from Leeds, UK said:
If the SC or SS shorts it will cause a mis-detection of P board fault leading to 4 blinks.
You can determine the failed board by unplugging the SC board or SS board.
When the SC is unplugged, if it is the P or SS it will blink 4 times, otherwise it will blink 6 or 7 times.
When the SS is unplugged, if it is the P or SC it will blink 4 times, otherwise it will blink 8 times.
With both boards unplugged, if it is the P then it will blink 4 times, otherwise it will blink 6, 7 or 8 times.
I ordered an SC board, the part number for which you can find in the Pansonic Service Manual for the TC-P50G20 on page 96. Search for this PDF: panasonic_tc-p50g20_tc-p50g25_chassis_gpf13du.pdf The part number is: TXNSC1LPUU (CIRCUIT BOARD SC)
While waiting for my part to arrive, I still had some angst that I didn't have all the information and kept searching. I eventually found the "2010 Plasma TV Technical Guide" (link below) which is a slide deck for service technicians from Panasonic. These "Technical Guilds" are easy to find for older 9th, 10th generation sets, but I had more trouble finding this one. On Slide 76, there is a troubleshooting tree that pretty much confirmed what Tom from Leeds said above.
The replacement SC board arrived, and was super easy to replace, but I made sure the TV had been powered off for a few hours to make sure there was no High Voltage waiting for me. Once replaced, the TV powered up just fine. Total down time was 3 days. ( I paid for 2nd day shipping)
Troubleshooting Technical Guide:
Thanks go out to those who have posted before me to lay the breadcrumbs that lead to my solution.
Hopefully this summary will help other Gen 13, 2010 owners find the documentation they need to troubleshoot and repair their own sets. What I learned in my research was certainly worth the $230 (the minimum on-site service chage without parts) that it would have cost me to have our local, overworked, TV repair guy would have charged me. From what I've heard, it could have taken more than a week for him get the job done.