About Standby Circuit
I got many emails asked about how to solve power supply/equipment standby problem. They told me that power LED did not turn to green and always in amber/orange colour. For your information, the first thing that you need to do is to make sure the right voltage is entering the CPU. Most of the standby circuits are controlled by CPU. The CPU must get the right voltage in order to perform its task. You have to know that the signal of the power LED came from CPU. If the CPU itself have problem, wrong supply voltage, bad corresponding components, missing input signals, bad crystal waveform, corrupted EEprom data and etc would cause the LED to turn amber colour.
So, in the future if you come across any standby problem in electronic equipment, make sure you test out the possible circuits that i have just mentioned above.