Read Sharp LC-28HM2E (serv.man2) Service Manual online
15
LC-28HM2
AN-28SP2
POWER SUPPLY START-UP SEQUENCE
1. System connections
»
AC power connection at Display unit.
»
AC power connection at AVC system unit
»
System cable connection tying the Display unit and the AVC system unit
2. Power supply start-up sequence
1
Turn on the main power switch positioned at the top of the Display unit.
2
Main power supply of the Display unit sends out +5V main power for microprocessor (P2001_5).
3
After resetting the display microprocessor, +5V output is present at SMPOW (J4001_22).
(At the same time, the power is supplied to each line.)
4
Main power relay switch is turned on at the AVC system unit.
(At the same time, the power is supplied to each line.)
5
After the AVC system unit has been initialized, the backlight illumination command is emitted to the Display
unit.
6
Start-up sequence is terminated when the backlight is ON.
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