Sony televisions commonly rely on a self-diagnostic tool for troubleshooting errors and power issues. If your television is not working properly, you can analyze a set of blinking lights to figure out the core issues before a repair. In most cases, your television will need new parts or a complete replacement.
Identification
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The blinking lights occur on the front panel of the television. To figure out how many blinks there are, start counting them as they flash on and off. After the blinking stops for three seconds, it restarts again and continues as long as the television has power. Count the number of blinks two to three times to make sure you get the exact count.
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D Board Errors
The D Board is the main power supply that processes video and power to the television. A 2 Blink error code indicates that functions on D Board have shorted out. A 4 Blink error code indicates a power issue with the D Board, and could be associated with the TV's power supply. A 7 Blink error indicates that the D Board parts Q8035 and Q8038 have shorted out.
Overvoltage Errors
The rest of the blinking code errors on Sony televisions have to do with overvoltage issues that occur when faulty circuits cause too much power through the television and force it to shut down for safety issues. The 3 Blink code means that the G Board parts IC501 and IC5002 are faulty and the TV remains in standby mode. The 5 Blink code is a white balance issue caused by video out errors and the CRT drive, and means that these parts need replacement or repair. The 6 Blink Error affects the TV picture, and only sound plays when the A and B boards fail due to over voltage. The 9 Blink error is an audio error caused when the A board is shorted out.
No Blinks
There are two occasions when an error occurs but there is no blinking. If the light does not come on at all, then there is a power or fuse issue. Plug the television into another outlet to make sure that the problem is not the original outlet. If the light remains solid, there is an issue with the video relay, and you'll likely need to replace the television.