Power Stage; Microcontroller Port Configuration - Hitachi 22LD3750DC Service Manual

Back End
MST-TSUMU38BF has two ADC inputs. First ADC input is assigned to the VCTI RGB output.
Other RGB/YPbPr inputs are multiplexed for the second ADC input. HDMI receiver ANX9021 analog
output, VGA RGB input and the synchronization signals are multiplexed by a primary RGB switch
(PI5V512). MST-TSUMU38BF has an embedded LVDS transmitter. There are three PWM output ports.
PWM0 is assigned to analog/digital dimming control for the backlight, PWM1 is used for backlight
on/off and panel logic power supply on/off control and PWM2 is used to control PC/HDMI switch IC
(PI5V512).

3 POWER STAGE

The DC voltages required at various parts of the chassis and inverters are provided by a main power
supply unit and power interface board. IPS generates 12V and 5V DC supply. Power stage which is
on-chasis generates +12V for audio amplifier and 5V stand by voltage and 33V, 12V, 5V, 3.3V and 1.8V
supplies for other different parts of the chassis.

4 MICROCONTROLLER PORT CONFIGURATION

PIN PORT
NO NAME
47 P10
48 P11
49 P12
50 P13
51 P14
52 P15
53 P16
54 P17
SIGNAL NAME
MST_RESET
PROTECT
TV_RXD
TV_TXD
IRQ
KEY
SC_PIN8
DVD_IR_ON/OFF
POWCON
TYPE FUNCTION
O Scaler reset
I Short circuit detection
I IDTV UART receive signal
O IDTV UART transmit signal
O IDTV interrupt request signal
I Keyboard function select
I Scart function select
O DVD infrared signal on/off control
O Standby on/off control
4