Block Diagram - HANNspree 1E03-37GT Service Manual

Block diagram

Circuit Description
Power Circuit:
Switching power Model provide this machine 3 batch power: +12V, +5V and +24V. +5V
is Stand-By power, with +12V provide every circuits in main board needed power .+24 is
back light power.
A.Cold-Opening Mode：
•When connect with AC, switching power produce +5V voltage immediately
(circuit mark Vsub) and provide U1(PW106B) the needed stand-by voltage to
turn on the machine
•This machine is in Stand-By Mode now.
B.Stand-By Mode(+5V)
•When this machine is in Stand-By mode, only U1(PW106B) and
U25(EN29LV160) keep workings, U1 enter power saving mode, so the system
can assure the consumption power is < 2.5W in Stand-by Mode.
C.Power ON Mode
•When the system receives the start order by Power Key of the remote control
or Power ON/OFF of the control panel, it enter power ON mode.
•When switching power receives the start order by U1, via Q23 to control
Switching power Model provides +12V and +24V voltage . .
•After every batches of digital board process Power ON procedure,U1 via
BKLTPWER(=H) to start Inventer and light the back light.
•The Block Diagram shows the voltage of Power ON Mode and IC.
U1
PW106B
5