TCL LCD32M61S3-MS19, Service Manual

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Power Logic Sequence
Power Supply Unit
inverter 24v
Panel
P2
GND 4
U1/U2
GND 3
12V 2
12V-AMP
1
5Vstb 5V
U6 regulator
U7
3.3V 1.8V
U10 U11
U8
CPU/DECODER/
SCANNER
EEPROM
on-pback
5v
on/off panel on/off
Description:While the power cord plug in, the TV is in
standby situation,power supply unit provide 5Vstb 200mA for
load.There is no 12v amplifier power supply and 24V
inverter voltage supply. The 5Vstb through D7 and regulator
U5 get 3.3VA supply for IC (MST19E),the another path of
circuit is 5Vstb through regulator U6 get 3.3V then
regulated by U7(regulator) get 1.8V supply for
U8(MST19E),drive the LED lighting,and standby circuitry
working,and CPU controlling,reset circuitry,crystal.So that
it makes the CPU can receive and send kinds of command.
while there is turn on command(low level) send out from
Pin150 of U8(MST19E),power supply unit provide 12V and 24V
voltage.12V voltage supply for U1/U2,change to 5V voltage,
regulate by U6, change to 3.3V supply for U8 others
parties. 24V voltage supply for inverter board of Panel.