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How many times do this standby light flashes at one time switch ON? Count this and make sure, how many times it blinks. These blinks are fault indications. From these number of blinks, you will get an idea about the faulty section circuit inside it. It will narrow down the troubleshooting. If you wish to get more details about Sony Blinking Codes; check this link.
sounds like bad capacitors on the power board. Very common problem. I would look at the caps if any appear even slightly rounded on top they are bad. They should be perfectly flat on top any puffing up means replace that cap.
Before going OFF, the standby LED might blink. These blinks are fault indication. The number of blink should be counted. Count the number of blinks at one time, before the TV goes OFF. [eg: 4 blinks Power SOS P Board; 6 blinks Driver SOS 1 SU / SD / SC Boards
(SC energy recovery circuit)] and so on. you can get more details from this site named 'Electro-help'. You can reach it by searching the keyword "electronicshelponline" by internet.
Blinking of standby light are fault indications. To get more details about this fault, vist this site. Type in the site name, either to Google or Yahoo search box and click search. The site is powered by Google. site name is "Electro-help" Click open the same named site with a hyphen in between words. It is an electronic repair help site.
Visit this site for details. All information about this type of fault [2 blinks of standby light to sony Trinitron]; are described here in detail. "Electro-help", is the name of the site. Search for it on Google.
if you have power problem without blinking lights or standby lights (red) the possible problem is power supply board..However if the TV have blinking or standby light but won't turn ON..there are multiple cause of that and need further troubleshooting..
Usually Sony and LG Blinking Codes are the same. Here is what I have.
Unit is dead, No blinks - Problem in the standby power section. Might check fuse,
Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.
One blink - not used for the self-diagnosis
Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.
Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit,
Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted.
Five 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. In addition, unit could be in IK blanking, try turning up screen slightly.
Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately.
Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.
Eight blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code.
Nine blinks - Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times you get flashing Make sure the regulator is -12 or -13 (negitive).
Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors are bad, check R8051 and IC8005, also on the "D" board.