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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. 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.
In standby mode (red led on/after the led stops from blinking), press "Display", "5", Volume (-)", "Power on" on the remote control in sequence, self diagnostic screen will be display, let me know the what is on the screen to diagnose where the fault came from.
Please check batteries in remote that seems not working. Sony TV would either turns On or standby light will blinks if TV gets any internal problem. You question shows standby light stays On that means TV does not receive power on command from remote. If standby light is blinking in sequence, let me know how many times it is blinking and also intimate exact model number of TV to find out possible solution. Thanks.
The 5 blinks can indicate a picture tube starting to fail. Carefully open up the back and look for the flyback transformer. It will be the part with the large red wire coming out the top that goes to the side of the picture tube. There should be 2 controls on the flyback, screen and focus. Turn the screen control slightly clockwise. If the set stays on, the picture tube is starting to fail and you have bought yourself time to find a replacement. If that fails, then you will need to investigate other possibilities that will involve soldering. Let me know if you need to do that.
The 6 blinks indicate no horiszontal. This can be as simple as a couple of bad capacitors or the "jungle" IC. If you can solder, please post another question with the model and a brief description indicating that you can work in the set and we'll continue to track this down.
The 7 blinks indicate a high voltage shutdown (high voltage exceeded 33,000V). This is usually caused by a defective regulator. Could you please post the exact model number (KVxxx) and I'll look up the part you will likely need?