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Service manual of MT31AS
The flow of low voltage power supply
Test the power supply of Main board when power is on. Test the DS1's cathode voltage to
GND is +12V for debarring the power unit abnormal. 5V_STB and 3.3V_STB are get from +12V by
U3 and UA3. The power supply on standby just provides to Main IC, Key board, IR board, and the
power on signal of Main IC start.
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