LG C3400 Service Manual page 22

The backlight of LCD module is controlled by DBB via AAT2807 , U402. The control signals
related to Backlight LED are given bellow.
Signals
C_FLASH
(GPIO_24)
LCD_DIM_CTL
(GPO 23)
FLASH_LED
MLED
MLED[1:3]
Table 3-4. DESCRIPTION OF LCD BACKLIGHT LED CONTROL
C. RF interface
The AD6527B control RF parts through PA_BAND, ANT_SW1, ANT_SW2, CLKON , PA_EN,
SEN, SDATA, SCLK, RF_PWR_DWN.
Signals
PA_BAND (GPO 17)
ANT_SW1 (GPO 9)
ANT_SW2 (GPO 11)
CLKON
PA_EN (GPO 16)
SEN (GPO 19)
SDATA (GPO 20)
SCLK (GPO 21)
RF_EN (GPO 4)
Description
Control flash ON and OFF
Control LCD backlight level in 16 steps
Voltage source for FLASH LED
Current source for backlight LED
This pins are returned-paths for backlight LED current source (MLED)
Description
PAM Band Select
Antenna switch Band Select
Antenna switch Band Select
RF LDO Enable/Disable
PAM Enable/Disable
PLL Enable/Disable
Serial Data to PLL
Clock to PLL
Tranceiver chip on/off select
Table 3-4. RF CONTROL SIGNALS DISCRIPTION
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3. TECHNICAL BRIEF