We own a very old Pioneer SD2601 TV, and it worked perfectly until two days. The red standby light goes on every time we push the main switch, instead of the usual green.
We tried unplugging it, and pushing random buttons. Since it's old, the support manual is missing.
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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
The blinks are fault indication. If the standby light blinks 10 times and the set shuts down after that; 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