Decode And I/O Units; The Flow Of Low Voltage Power Supply - THOMSON MT31AS Service Manual

Service manual of MT31AS
The waveform of MOS'S
The Schematic diagram of BL driver

5.3. Decode and I/O Units

5.3.1. The flow of low voltage power supply

Checking the low voltage power supply is principal step when you are maintaining the
badness. It's meaningless to analyzing the circuits without affirming the power supply is OK.
Referring the flow of low voltage power supply, the Decode and I/O units get +12V power from
the power unit. Each voltage of the elements need is transformed from +12V by DC-DC and LDO.
Switch IC and MOS switch circuits can control the supply current in real time to insure the Main
board work normal.