Read Panasonic KX-NT680RU-B Service Manual online
10
KX-NT680 Series
4.2.
Circuit Operations
4.2.1.
Color TFT LCD display
LCD display datas are output from LCD I/F of IC1001 to Color TFT LCD display module.
This color TFT LCD is powered by +3.3V (CN6001 pin4 )and VLED+- (CN6001 pin 1,2)voltage.
VLED+-(LED backlight voltage ) is powered by IC3005 block(constant current circuit) with PWM control.
The PWM (Pulse Width Modulation) signal is output from IC1001 (pin U13) pin and the brightness is changed according to its duty
ratio.
This color TFT LCD is powered by +3.3V (CN6001 pin4 )and VLED+- (CN6001 pin 1,2)voltage.
VLED+-(LED backlight voltage ) is powered by IC3005 block(constant current circuit) with PWM control.
The PWM (Pulse Width Modulation) signal is output from IC1001 (pin U13) pin and the brightness is changed according to its duty
ratio.
4.2.2.
Reset Circuit
Reset Signal is output from IC4001 and input into IC1001-pin V12.
PDN is DC power down detect.
Detect the AC and PoE power down signal.
PDN is DC power down detect.
Detect the AC and PoE power down signal.
PHY_RST
ASIC_RST
ASIC_INT0
R1020
R1019
R1019
R1018
DSS_RST
LCD_R[2]
LCD_R[3]
LCD_R[4]
LCD_R[5]
LCD_R[6]
LCD_R[7]
LCD_G[2]
LCD_G[3]
LCD_G[4]
LCD_G[5]
LCD_G[6]
LCD_G[7]
LCD_R[3]
LCD_R[4]
LCD_R[5]
LCD_R[6]
LCD_R[7]
LCD_G[2]
LCD_G[3]
LCD_G[4]
LCD_G[5]
LCD_G[6]
LCD_G[7]
LED_RED_CONF
LED_RED_FWD
LED_RED_MUTE
LED_GRN_RINGER
LED_RED_RINGER
LED_RED_STORE
LED_RED_FWD
LED_RED_MUTE
LED_GRN_RINGER
LED_RED_RINGER
LED_RED_STORE
HEAD_DET
ST3
LCD_B[2]
LCD_B[3]
LCD_B[4]
LCD_B[5]
LCD_B[3]
LCD_B[4]
LCD_B[5]
LCD_B[6]
LCD_B[7]
LCD_B[7]
LCD_VSYNC
LCD_HSYNC
LCD_DE
LCD_HSYNC
LCD_DE
LCD_R[1]
LCD_G[0]
LCD_G[0]
LCD_G[1]
LCD_B[0]
LCD_B[0]
LCD_B[1]
LCD_R[0]
LCD_PCLK
LCD_PCLK
LCD_EN
R1100
R1101
R1102
R1101
R1102
R1112
R1116
L1003
C1066
C1067
DG
DG
RA1005
1
8
2
7
3
6
4
5
RA1006
1
8
2
7
3
6
4
5
RA1007
1
8
2
7
3
6
4
5
RA1008
1
8
2
7
3
6
4
5
R1117
R1118
R1121
R1121
R1122
R1123
R1123
R1124
R1131
R1131
R1132
BT_RST
R1021
C1078
C1081
DG
C1109
C1082
C1083
C1084
C1085
C1086
C1092
C1088
C1090
C1087
C1089
C1091
C1098
C1094
C1096
C1093
C1095
C1097
C1100
C1099
C1101
C1102
C1103
C1104
C1105
C1106
C1107
C1108
IC1001
L4
MEMXD2/LCDD4
M1
MEMXD1/LCDD3
M4
MEMXD0/LCDD2
L1
MEMXD3/LCDD5
M2
MEMXD4/LCDD6
K2
MEMXD5/LCDD7
K1
MEMXD6/LCDD10
J2
MEMXD7/LCDD11
H1
MEMXD8/LCDD12
J1
MEMXD9/LCDD13
K3
MEMXD10/LCDD14
K4
MEMXD11/LCDD15
N1
MEMXD12/LCDD18
L2
MEMXD13/LCDD19
L3
MEMXD14/LCDD20
M3
MEMXD15/LCDD21
H4
MEMCS3/EXTINT7
H3
MEMCS2/EXTINT6
G4
MEMCS1/LPCLK
G3
MEMCS0/LCDD0
E4
MEMRD
J4
MEMWR
E1
MEMXA20_MEMRAS/LCDD16
F2
MEMXA19_MEMCAS/LCDD9
F1
MEMCKE/EXTINT13
G1
MEMCLK
D4
MEMXA16
F4
MEMXA15
D3
MEMXA14_BA1/LCDD8
D1
MEMXA13_BA0/LCDD1
G2
MEMXA12/EXTINT14
F3
MEMXA11/LCDGP8
C2
MEMXA10/LCDGP7
E2
MEMXA9/LCDGP6
E3
MEMXA8/LCDGP5
D2
MEMXA7/LCDGP4
C1
MEMXA6/LCDGP3
C3
MEMXA5/LCDGP2
B2
MEMXA4/LCDGP1
A3
MEMXA3/LCDGP0
A2
MEMXA2/EXTINT4
B3
MEMXA1/LCDD23
B1
MEMXA0/LCDD22
H2
MEMDQMBLS0/LCDD17
J3
MEMDQMBLS1/EXTINT5
DCIN
C3071
IC3005
1
SW
2
GND
4
CTRL
5
OV
3
FB
6
VIN
L3005
C3068
C3067
R3020
R3022
R3023
R3021
R3017
C3072
C3073
D3004
DG
DG
DG
DG
DG
VLED-
VLED+
LCD_PWM
LCD_R[0]
LCD_R[1]
LCD_R[2]
LCD_R[3]
LCD_R[4]
LCD_R[5]
LCD_R[6]
LCD_R[7]
LCD_G[1]
LCD_G[2]
LCD_G[3]
LCD_G[4]
LCD_G[5]
LCD_G[6]
LCD_G[7]
LCD_B[0]
LCD_B[2]
LCD_B[3]
LCD_DE
LCD_B[4]
LCD_VSYNC
LCD_EN
LCD_B[5]
LCD_HSYNC
LCD_B[6]
LCD_PCLK
LCD_PCLK
LCD_G[0]
LCD_B[1]
LCD_B[7]
LCD_EN
LCD_HSYNC
LCD_VSYNC
LCD_DE
C6002
LCD_PCLK
VDD3R3V
CN6001
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
C6001
VLED+
VLED-
DG
LCD
LCD_DE
C6005
C6006
C6003
LCD_VSYNC
L6001
LCD_EN
DG
LCD_HSYNC
DG
C6034
C6033
C6032
C6031
C6030
C6029
C6028
C6027
C6026
C6022
C6021
C6020
C6019
C6018
C6017
C6014
C6013
C6012
C6011
C6010
DG
DG
C6004
C6025
C6024
C6023
C6016
C6015
C6009
C6008
C6007
DG
R6015
R6012
R6013
R6014
IC1001
AG
VDD1R3V
PWR_RST
C4056
C4066
PDN
003:6C
003:6C
R4025
3R3V
C4041
IC4001
4
OUT
3
CD
1
VSS
2
VDD
L4009
C4063
C4040
DG
DG
DG
DG
TPX1
P13
TPX2
R18
TPY1
T18
TPY2
P18
TPS
V12
RSTN
T12
TEST_ANA
L16
IF_CLK_IF
P14
VREF
D12
VDD0
E5
VDD1
E6
VDD2
E8
VDD3
H5
T17
DC_J
PDN
004:5D
R3018
D3005
C3070
C3069
PoE_DC
+12V
JK3001
2
3
1
F3001
32V
3A
R3019
D3002
D3003
LF3001
2
3
4
1
DG
DG
C3035
C3034
R3025
DG
C3032
R3024
C3036
DG
C3066
DG
C3033
C3028
from PoE
from AC Adaptor
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