Panasonic plasma 50PZ85 power led blink 10 times

bad power transformer return unit

Bulged Cap issue is to do with power sub-system and generally more in the LCD/LED tv not Plasma.

Begin from
42 Class 41 6 Diagonal Plasma HDTV with EZ Sync

Do you get blinking codes ?
Panasonic TH 42PX70 St By Light Flashes 10 Times
Not sure if it is the thermal fuse issue in your case though.
See How to Repair PANASONIC Plasma TV with Blinking LED TH 42PZ77U TH 42PZ700U

Hi,
By blinking led its shows where is exactly the complaint. You have to count the blinking. How much time its blinks in one sequence. the only it will be possible to say is it power supply or any other boards.

www.electro-medical.blogspot.com

That is a power suuply problem,i have the same problem i looking for a solution to fix my or i gonna buy a new one,also new onw is spensive on ebay some people offer the repair service good look

Same issue with - Panasonic TH-50PX70A , power UP with red standby, then power ON by remote - only Gives GREEN led blinking 35-40 times, followed by solid green led with no no picture no sound.
>> Solution; unplug Plasma from AC 10-15min, then plug in & power on to Red standby led,, At this point - Power ON tv while holding down both -Volume Down and F (function Select) buttons (front panel door) at the same time turns picture ON,all ok.

Those 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://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to 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

Panasonic said "A" board,
A board SOS Detect (Explanation)
10 Blinks SOS: The voltage regulators IC5400 and IC5401 in the A board generate SUB9V and SUB5V. The 9V and 5V from these ICs are monitored by IC1100. Any abnormality on the SUB9V or SUB5V lines, triggers the shutdown circuit and the MPU shuts down the unit. The power LED blinks 10 times.

But need to measure the connection SC2, if it short, it will be the SC board.

The knowledge obtain from: Real case of repair by myself.
Information from Panasonic training manual.