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.
This KDL55EX621 TV was working great until one day it was showing that an HDMI connection was available but when it was engaged there was no signal on any HDMI input. The VGA and TV inputs were still working and then they stopped too. Now it only makes the start sound then turns itself off and flashes red 8 times.
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