7-4
5. INTERFACE BOARD BLOCK DIAGRAM
U404 DC-DC
5V-3.3V
5V-2.5V
U401 I2C
24LC02B
X401
14.318M Hz
U402
74LVC14
U501
Audio IC
P401 D-sub Connector
U407
1M Memory
S404 To Panel
S405 To
Key BD
S402
Serial Port
J502 To
Headphone
S502 To
Speaker
J501
Audio IN
S403 To
Power BD
U408 I2C
24LC16B
H,V
R,G,B
+5V
Panel VCC
On/Off
Backlight On/Off,
PWM
Panel
Power
Volume,
STBY,
MUTE
NVRAM Clock
NVRAM Data
DDC Clock
DDC Data
U409
Switch IC
U405
Scaler
Gm2121
LVDS