LG HB620 Service Manual page 69

3. TECHNICAL BRIEF
3.10.7 Display
LCD module is connected to LCD F-PCB with 40 pin B TO B connector.
The LCD module is controlled by 16/18-bit EBI2 in MSM6280.
MAIN_LED1
MAIN_LED4
WLED_PWR
FILTER_LCD_RESET_N
FILTER_MM_LCD_DATA[15]
FILTER_MM_LCD_DATA[13]
FILTER_MM_LCD_DATA[11]
FILTER_MM_LCD_DATA[9]
FILTER_MM_LCD_DATA[7]
FILTER_MM_LCD_DATA[5]
FILTER_MM_LCD_DATA[3]
FILTER_MM_LCD_DATA[1]
Audio Signal Processing & Interface
Audio signal processing is divided uplink path and downlink path. The uplink path amplifies the audio
signal from MIC and converts this analog signal to digital signal and then transmits it to DBB Chip
(MSM6280). This transmitted signal is reformed to fit in GSM & WCDMA frame format and delivered to
RF Chipset. The downlink path amplifies the signal from DBB chip (MSM6280) and outputs it to
receiver (or speaker).
The receive path can be directed to either one of two earphone amplifiers or the auxiliary output. The
outputs earphone1 (EAR1OP, EAR1ON) and auxiliary out (LINE_OP, LINE_ON) are differential
outputs. Earphone2 (HPH_L, HPH_R) is a single-ended output stage designed to drive a headset
speaker. The microphone interface consists of two differential microphone inputs, one differential
auxiliary input and a two-stage audio amplifier.
LGE Internal Use Only
CN103
G2
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
MM_LCD_RD_N
5
FILTER_MM_LCD_ADS_N
4
MM_LCD_VSYNC
3
2
1
G1
AXK8L40125G
ENBY0020201
- 70 -
TCC_2.7V_EHI_LCD
21
22
23
24
25
26
FILTER_MM_SUB_LCD_CS_N
27
28
29
30
31
32
33
34
35
FILTER_MM_LCD_WE_N
36
MM_MAIN_LCD_CS_N
37
LCD_MAKER_ID
38
39
40
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
MAIN_LED2
MAIN_LED3
MAIN_LED5
LCD_IF_MODE_0
FILTER_MM_LCD_DATA[14]
FILTER_MM_LCD_DATA[12]
FILTER_MM_LCD_DATA[10]
FILTER_MM_LCD_DATA[8]
FILTER_MM_LCD_DATA[6]
FILTER_MM_LCD_DATA[4]
FILTER_MM_LCD_DATA[2]
FILTER_MM_LCD_DATA[0]