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Power supply board is dead.That the board,the power a/c cord go into it.Replaced the power supply board will solved ur tv power lite LED light indicator blinking and ur tv power will be stable and work again.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
helloFive blinks - AKB circuit (automatic kine bias), the
timer/standby indicator blinks for about 30 seconds then goes to the
self-diagnosis function. Something is wrong with the video. Check video
out, Q705, 732, 761 and other components on the C board, also check
Q218, 219, 220 on the A board. In addition, unit could be in IK
blanking, try turning up screen slightly.
If you have the flashing red light of death you can use the chart below to see what the blinks indicate and call Panasonic and have the part replaced, at the bottom of this page is the meaning of terms.
BLINKS PROBLEM MALFUNCTIONING PART
1 blink STV 5v sense DG Board
2 blinks 15v SOS D Board
3 blinks 3.3v SOS D Board
4 blinks Power SOS P Board
5 blinks 5v SOS D Board
6 blinks Driver SOS 1 SU / SD / SC Boards (SC energy recovery circuit)
7 blinks Driver SOS 2 SU / SD / SS Boards (SC floating voltage area)
8 blinks Driver SOS 3 SS Board (SS energy recovery circuit)
9 blinks Panel Config. SOS
10 blinks Sub 5v SOS / Main 3v SOS DG Board DTV 9v SOS / Tuner Power SOS
11 blinks Fan SOS PB Board
12 blinks Sound SOS H Board
13 blinks Communication error DG Board with IC8001 (Pesks Lite 2)
Panel = Plasma Display Panel (Plasma Glass) D Board = Format Converter / Plasma AL / Sub-Field Processor DG Board = AC-DC Converter / Digital Signal Processor / Full HD Microcumputer HDMI Interface / Peaks Lite 2 H Board = Speaker Out / Sound Processor AV Terminal / AV Switch P Board = Power Supply PB Board = Fan Control SC Board = Scan Drive SD Board = Scan Out (Lower) SS Board = Sustain Drive SU Board = Scan Out (Upper)
Does the ligh blink a certain number of times and the stop briefly and repeat the same pattern? If so you have a problem that is beyond your ability to service it and must be serviced by a certified sony tech.
call a tech let them check your tv if no power it will be the power supply or related circuits.if you have sound then it could be video circuit module.as you said that it dont have pictures you did not mention anything about sound.good luck