My new TV won't turn on with the remote, but the power button still works. The remote blinks red 3 times, but does nothing and I have made sure to select TV on it before trying to push a button. I am still under 30 days on this one and its the second model that has had power issues. Any ideas on what this could be? I was under the impression that Plasmas where a developed technology with all the kinks worked out. This is frustrating....
Panasonic uses the flashing of the power LED as a guide for trouble shooting their sets when no image is visible. So if the power LED blinks 3 times then the D board is defective. Basically its the main control board. It needs to be serviced.
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3 blinks with Panasonic TVS denotes the fault with 3.3v SOS D Board. Visit this site for more details. Just type in "electronicshelponline" into
the search box of your browser, and click search, and select the site named
(Electro-help). You can see a site by
this name. Pull up older posts there.
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availability of spare parts and prices.
need replaced A-BOARD
After the installation of a new A board, unit has the characters "CHK" on screen. The usual reset procedures of [VOL -] and [MENU] or [OK] or [SLEEP] will not get rid of "CHK".
1. Enter the service mode by holding down the [VOL -] button on the TV (main unit) and simultaneously pressing the [INFO] button on the remote control three times. 2. Press the number  key on the remote to highlight [SRV-TOOL]. 3. Press the [OK] button on the remote control to select [SRV-TOOL]. 4. Use the [DOWN ARROW] on the remote control to scroll down to [PCTC]. 5. Use the [RIGHT ARROW] button on the remote to open the box to the right, then press and hold down the [MUTE] button on remote to display Time/Count. 6. Press and hold the [RETURN] button on the remote control until the TV turns off. 7. Immediately press and hold down the [VOL -] button on the TV (main unit) and the [MENU] button on the remote. The TV should come up in the Self Check mode. 8. Remove AC power.
On a Panasonic TV the 10-blink error code can sometimes be caused by low voltage running through an HDMI cable, particularly from a Media PC or some video game consoles. Try disconnecting any HDMI cables and unplugging the Television for 30 seconds, then power it on without the cables attached.
If this works, connect the cables to the front panel (usually HDMI-3) which uses a different controller board.
same frustrating symptoms on brand new 42inch here! tv just turns itself off sometimes without warning or if changing to certain channels. leaves red light flashing for a while then red light goes away. any attempts with remote gives flashing green liht on tv. manual power off and on restarts tv but auto off again. found while manual power on keep changing channel on remote till stable picture appears. then use remote to shut down tv - solid red light indicates standby mode. then use remote to turn on again... till next time it happens. but what is technical fault??