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About Standby Circuit

By on October 17, 2009

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.



  1. chris bolt

    October 18, 2009 at 4:08 am

    Mr. Yong, if the eeprom is corrupted. How can I reprogram it? do you have a previous blog on how to program it. Please link me! Thank you for the effort of answering some of my question.

  2. admin

    October 18, 2009 at 8:38 pm

    Hi Chris,

    You need an eeprom programmer and you can visit this website



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