Side Boards And Connectors - Hitachi 22LD3750DC Service Manual

PIN PORT
NO NAME
55 P20
56 P21
62 Safety
78 FBIN
85 Vert+
27 P22
28 P23
5 SIDE BOARDS & CONNECTORS
5.1 Keyboard
A four-pin connector is used between 17mb29 and the keyboard:
KEY signal is sent directly to microcontroller ADC port and depending on the voltage level of
KEY signal, microcontroller performs one of these actions: menu, program+, program-, volume+,
volume- and source.
SOFT_SW signal is used to switch between "power-off" and "standby" modes.
SIGNAL NAME
HDMI_HP_INV
CS
VCTI_HS
DVD_SENSE
TV/DVB_SW
WP
IR
Table 4.1 VCTI port configuration
TYPE FUNCTION
O HDMI hot plug signal
O Switching control for Mstar bus and system I2C
O VCTI composite sync output
I DVD module detection
O IDTV/TV I2C and AGC switch control for tuner
O Write protection control for NVM
I Infrared input
5