When i unplug the tv and plug it back in at the picture works for a second then goes black and starts blinking red standby. it does this 4 times then repeats
One option to try is to try to factory reset the tv, to do this turn the tv on hold the Down Arrow on the remote and while doing this press the power button then release the down arrow button.
Bit of info on your issue
* Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505
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SOURCE: TV turn on and off
Your TV has a power problem, it maybe high or low supply voltage that causes the TV to turn it self off because of an error. A technician from the manufacturer knows what error it has just by looking at the flashing standby light. Best is to take it to an authorize service center for repair... ^_^
SOURCE: tv immediately turns off
Four flashes indicates a problem with the backlight on the TV. It can be caused by the backlight inverter board (the power supply for the backlight) or by defective backlights in the panel It is USUALLY the backlight inverter board that is bad, but I have seen both components fail at various times. This set is fairly new and should still be withing the one year warranty, so you should contact Sony at 800-222-SONY to get it repaired. Be sure to rate this solution. Thanks!
SOURCE: tv tunrns on then goes to stand by flashes 4 times & repeats
turn tv on picture comes up 2to3 seconds later tv blacks out then stand by red light flashes 4 times in a row repeatedly..can not turn on or off when stand by light starts flashing but before tv blacks out you can turn tv on and off repeatedly and picture and sound work.You have to unplug power cord for 30 seconds after stand by light comes on to get tv to turn on.
SOURCE: Sony Bravia KDL 46", no picture, standby light blinks 4 times
Since the TV is still receiving power, the problem is going to be with the TV's mainboard. After you unplugged the TV and plugged it back in, you said the power light went out again, so I assume the standby light wasn't flashing again? The flashing standby light is indicating an error code so my suggestion is to contact Sony for service options regardless if there is a warranty or not because service is the only solution to this situation. Don't forget to provide them the error code or 4 flashes repeating.
SOURCE: my tv goes blank and
It may go into shutdown mode because of the short circuits in the power supply or in the backlight inverter board, look for bad caps first as suggested by TOOLKITS. You may have to diconnect the loads to see if the voltages come back.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
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http://en.wikipedia.org/wiki/Capacitor_plague
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