Does Equipment MCU Need Exact Voltage To Work?
What do you think? Does a MCU need the exact voltage to work? Actually it depends on the equipment itself. Some equipment need to have at least 4.85 to 4.9 volt to run properly (assuming if the MCU need 5 volt to run) otherwise it may cause some weird symptom to your equipment. To some equipment it can even run very well with 4.7 volt! In certain cases if the 7805 voltage regulator ic have problem the voltage could shoot up to 5.2 to 5.3 volt! The best is to replace the voltage regulator ic for the continuous of smooth operation of the equipment. If you have read the repair article by Kent about the LCD TV that automatically changing channel, the problem was caused by a defective voltage regulator- instead of producing 3.3 volt it output 3.7 volt! In the future if you troubleshoot any equipment that have some funny or weird symptom please make sure the supply voltage to the MCU (micro controller unit) is good.