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.
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SIGNAL NAME TYPE FUNCTION
HDMI_HP_INV O
CS O
VCTI_HS O
DVD_SENSE I
TV/DVB_SW O
WP O
IR I
Table 4.1 VCTI port configuration
HDMI hot plug signal
Switching control for Mstar bus and system I2C
VCTI composite sync output
DVD module detection
IDTV/TV I2C and AGC switch control for tuner
Write protection control for NVM
Infrared input
5