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5 blinks - check the 5v SOS D Board since the set is a plasma.
Your best best is to obtain a quote from an authorised Panasonic service centre on the likely cost to replace that board if required, then you can make a decision afterwards - to either go ahead with the repair, or cut your losses and purchase a new set if the latter option turns out to be cheaper.
Always ask about and insist on extended warranties whenever you buy a new TV such as plasmas. These will cover you against expensive repairs, and having to buy a new one each time the old one breaks down in the future.
These days manufacturers lean toward board replacement in plasma and LCD TVs rather than individual components, as it is quicker and easier to replace a whole board than to try and fix an old faulty one. It's also tidier in terms of layout.
It could be the temp sensor going bad. This sensor sits on top of the
metal housing which the bulb assembly slides into. The bulb assembly
will have a hole on top and this is where the sensor is above. There is a
small blue and white wire that plugs into it. If you pull the wire out
and put a paper clip or wire in the coupling you will basically bypass
the sensor connecting the blue and white wire. If your tv turns on then
that is your problem. Its cheap too. Here were my symptoms..1] Turn tv
on 2] Bulb would light up..(which eliminates the ballast) regular
picture would show up (which eliminates the bulb and color wheel) 3] 30
seconds later tv would shut down with 3 flashing lights. After bypass
the tv turned on as always and hasnt shut down yet. Always un plug tv
first. Get the replacement part to avoid overheating and possible fire
1. The TV remains on, yet there is no picture and no sound? Or does the TV turn off altogether? 2. How many blinks does the standby light give? Are they continuous? Is it the same each time, or random? 3. Did anything else happen before this, or did it just happen one day?
Answer that and I'll try to help with what I know.
I don't know the age of your set but I've found some Panasonics with a loose connection on the heat sink (an aluminum plate standing vertically on the circuit board) of the regulator IC (chip). The IC gets its ground through the heatsink. If the ground is open the power supply puts out too much voltage and causes the set to go into shut down. I've found this problem several times.