FUNAI LCD-A2006 User manual

SERVICE MANUAL
20"COLOR LCD TELEVISION
LCD-A2006/LCD-B2006/
LCD-C2006/LCD-D2006

4-4 L4620DC
TV Cable Wiring Diagram
Fig. D4
IR Sensor CBA
CN310
To Speaker
Function CBA
CN801
To Speaker
CLN53
CN101A
CN102A
CN103A
CN101B
CN102B
CN103B
Main CBA
CN404 CN304
Inverter CBA
CN301
CN302
CN303
CN53
CN106
CN31B
CN311 CN312
LCD Main
CBA Unit
To Liquid
Crystal
Panel Unit
To Liquid
Crystal
Panel Unit

7-1
System Control Block Diagram
L4620BLS
BLOCK DIAGRAMS
FUNCTION CBA
KEY-IN-122
CN31B
KEY-IN-211
IR SENSOR CBA
CLN53 RCV51
D51
RCV-IN33 REMOTE
SENSOR
IC151 (MICRO COMPUTER)
93
10
89 59 22
CN103B CN103A
RCV-IN11 BACKLIGHT-ADJ
22
P-ON-H66 PROTECT-113 13 PROTECT-214 14 VOLUME77 INPUT-099 INPUT-110 10 S-SW15 15 SCL18 18 SDA19 19
16
KEY-IN-1
RCV-IN
26
BUS-OPENV
RESET
P-ON-H
PROTECT-1 PROTECT-2
VOLUME
SDA
SCL
INPUT-0 INPUT-1
S-SW
SCL
SDA
88 24 46 27 78 45 28
13 11
X151 10MHz
XIN
XOUT
TO POWER SUPPLY BLOCK DIAGRAM TO AUDIO BLOCK DIAGRAM
BACKLIGHT-ADJ
P-ON-H
PROTECT-1 PROTECT-2
VOLUME
INPUT-0 INPUT-1
S-SW
SCL
SDA
MAIN CBALCD MAIN CBA UNIT
92
KEY-IN-2
CN106
CN53
RESET
IC153
4
AL+5V
CN102B CN102A
EEP-SDA 2 EEP-SCL 1 BUS-OPEN 4
CN105(NO CONNECTION)
IC152 (MEMORY)
SCL 6
SDA 5
7
WP
AL+5V
AL+5V
CN105 IS USED FOR ADJUSTMENT AT FACTORY
MPWEL
MPCE
MPOE
MPSEL-0
MPWEH
RESET
QH
HDIN/FBIN
BUS-OPEN 2 DVP-RESET-PC
8
DVP-CLK-PC
5
CN301(NO CONNECTION)
DVP-SOUT-PC
6
DVP-SIN-PC
7
DVP-CS-PC
4
MPSEL-0 3
Q156
3.3V<-->5V CONVERTER
Q155
3.3V<-->5V CONVERTER
Q152
3.3V<-->5V CONVERTER
Q154
3.3V<-->5V CONVERTER
Q153
3.3V<-->5V CONVERTER
AL+3.3V
2 5
25
2DVP-SOUT 2DVP-CS
2DVP-CLK
42DVP-SIN 3
79
H-SYNC
2DVP-RESET
91 AFT-IN11 11
AFT-IN
23 SLOW-SW17 17
SP-MUTE18 18 FBIN22 22
1
SLOW-SW-IN
SP-MUTE
84INSEL-MUTE
87 RAPID-SW16 16
RAPID-SW-IN
83 85 19
INSEL-MUTE
15 15
P-25V-ON21 21
NICAM-RESET
20 20
P-25V-ON
SC-VIDEO-MUTE
NICAM-RESET
S/C-JACK-MUTE
14 14
33 34 EEP-SCL
EEP-SDA
S/C-JACK-MUTE
SP-MUTE
INSEL-MUTE
NICAM-RESET
FBIN
RAPID-SW
SLOW-SW
S/C-JACK-MUTE
TO IF/VIDEO BLOCK DIAGRAM
AFT-IN
IC301
58 50 60 57 59 83 89
7
P-25V-ON
5
BACKLIGHT-ADJ
PROTECT-1
TO LCD BACKLIGHT BLOCK DIAGRAM
KEY SWITCH KEY SWITCH
LCD DRIVE / LCD SIGNAL PROCESS
POWER
VCOM
VCOM
20
TO LCD BLOCK DIAGRAM

7-2
IF/Video Block Diagram
L4620BLIF
JK751
15
11
7
VIDEO-B
VIDEO-G
VIDEO-R
TO AUDIO BLOCK DIAGRAM
CN103A
INPUT-0(INV) INPUT-1(INV)
TU1
SIF
SDA
SCL
7
10
9
SIF
MAIN CBA
VIDEO SIGNAL AUDIO SIGNAL
TO AUDIO BLOCK DIAGRAM
Q734
JK722 VIDEO1 -IN JK721 S-VIDEO -IN
TO SYSTEM CONTROL BLOCK DIAGRAM
CY
TO LCD BLOC
K
DIAGRAM CN103B
IC781 (INPUT SELECT)
SW CONTROL
10
911
INPUT-0 INPUT-1
TO SYSTEM CONTROL BLOCK DIAGRAM
Q872 Q871
(TUNER UNIT)
BUFFER
WF7
WF2
WF3
WF6
WF5 WF4
3 5
4
12 13
14
2 1
15
CVBS18 S-VIDEO-C5 S-VIDEO-Y6 VIDEO-R1 VIDEO-G2 VIDEO-B3 CVBS29
8
19
20
VIDEO-IN
VIDEO-OUT
SLOW-SW
17 16
16
RAPID-SW
AFT
VIDEO
Q781
BUFFER
WF8
SDA
SCL
S-SW
6
AUDIO AUDIO
AFT-IN
S/C-JACK-MUTE
FBIN
Q11
SLOW-SW
Q731
RAPID-SW
Q730
Q791
Q792
BUFFER
Q744
BUFFER

7-3
Audio Block Diagram
L4620BLA
MAIN CBA
AUDIO SIGNAL
VOLUME
TO SYSTEM CONTROL BLOCK
INPUT-0(INV) INPUT-1(INV)
SCL
SDA
IC871 (INPUT SELECT)
SW CTL
13
4 2 1
11 12
9 10
dBX/MNR PANDA1
FM/AM PRESCALE
I2C READ REGISTER
AUTOMATIC SOUND SELECT
NICAM PRESCALE
L-CH R-CH
AGC DEMODULATOR
A/D CONVERTER
I2C DECORDER
TO IF/VIDEO BLOCK DIAGRAM
TUNER
AUDIO1
AUDIO2
TUNER AUDIO1 AUDIO2
(L-CH) (R-CH)
2
12 13
IC831 (SOUND PROCESSOR)
AUDIO1(L) -IN JK723
SIF
JK724 AUDIO1(R) -IN
14
IC801 (AUDIO AMP)
7
VOLUME
11
AMP AMP
MUTE /STANDBY CONTROL
6 1
(R-CH) (L-CH)
2
JK801 HEADPHONE JACK
CN801
SP-R 1
GND 2
TO IF/VIDEO BLOCK DIAGRAM
3
15
WF1
CLN801
SP801 SPEAKER R-CH
TO SYSTEM CONTROL BLOCK DIAGRAM NICAM-RESET
43 22
AUDIO
RESET
6
INH
JK751
1
3
AUDIO2(L) -OUT AUDIO2(R) -OUT
6
AUDIO2(L) -IN
2
AUDIO2(R) -IN
Q732 Q733
Q741
Q742
INSEL-MUTE
S/C-JACK-MUTE SP-MUTE
DEEMPHASIS
SOUND SELECT
D/A CONVERTER VOLUME
SCART1 OUTPUT SELECT SCART1
CHANNEL MATRIX
30 31
STANDERD AND SOUND DETECTION
BUFFER
BUFFER
SP802 SPEAKER L-CH
CN310
CN304
CN404 CLN310
SP-L 1
GND 2
INVERTER CBA
SP-L22
GND11

7-4 L4620BLLCD
LCD Block Diagram
LCD MAIN CBA UNIT
VIDEO SIGNAL
IC301 (LCD DRIVE / LCD SIGNAL PROCESS)
TO IF/VIDEO BLOCK DIAGRAM CN103A
CN103B
182 181 180 179 175 174 173
QDRVHC QDRVVB QDRVHB QDRVHA/QDE
QDRVVA QDRVHE
QCLKL
LCD MODULE
VREF(4) 28 VREF(0) 32 VREF(1) 31 VREF(2) 30 VREF(3) 29 VREF(7) 24 VREF(5) 26 VREF(6) 25 VREF(8) 23 VREF(9) 22
104 105
103
VCOM 35 VCOM 36
PANEL+10.8V
CN311
169
168 167 166 165 161 160 159 158
155 154 153 152 151 150 146 145
LCD MODULE
TP322 TP323 TP318 TP319 TP320 TP321
143 142 141 140 139 135 134 133
132 131 130 129 128 127 123 122
121 120 119 116 115 114 113 106
TP316 TP317 TP312 TP313 TP314 TP315
CN312
OR(3)
31
OR(4)
30
OR(5)
29
OR(0)
34
OR(1)
33
OR(2)
32
OG(3)
24
OG(4)
23
OG(5)
22
OG(0)
27
OG(1)
26
OG(2)
25
OB(3)
17
OB(4)
16
OB(5)
15
OB(0)
20
OB(1)
19
OB(2)
18
ER(3)
3
ER(4)
2
ER(5)
1
ER(0)
6
ER(1)
5
ER(2)
4
EG(3)
47
EG(4)
46
EG(5)
45
EG(0)
50
EG(1)
49
EG(2)
48
EB(3)
40
EB(4)
39
EB(5)
38
EB(0)
43
EB(1)
42
EB(2)
41
CVBS1 8 CVBS2 9
S-VIDEO-C 5 S-VIDEO-Y 6
VIDEO-B 3
VIDEO-R 1
VIDEO-G 2
VCOM 3 VCOM 4
CN312
84 85
X301 54MHz
XIN XOUT
CLKV 14
VCOM CONTROL
Q971 IC981
91
95 96
98
STV1 13
LP 44
CN311
POL 43
HMS1-E 7
CLKH 10
STH1 42
HMS1-O 13
WF11
WF10 WF12
WF9
VIDEO SIGNAL PROCESS
NTSC/PAL SEPARATION
BURST LOCKED
OUTPUT CONTROL CHROMA DECODER
SECAM PDM
RCO
PANEL SIGNAL PROCESS
TV SIGNAL PROCESS
INPUT CONTROL
CVBS Y C
B
G
R
A/D
A/D A/D A/D
33 44
13 42 40
21
31
QDRVHC
97
WF14WF13
B G R B G R
R905
R907 R901
R904
R902
R997
VCOM
TO SYSTEM CONTROL BLOCK DIAGRAM

7-5 L4620BLP
Power Supply Block Diagram
LINE FILTER
L601
AC601 AC CORD
BRIDGE RECTIFIER
D605-D608
HOT COLD
T601
9
11 12
13
10 16
4
4 3
1 2
MAIN CBA
CN101A
HOT CIRCUIT. BE CAREFUL.
2 6 7
AL+33V
AL+3.3V
AL+7.5V
INV+22V
P-ON-H
P-25V-ON
AL+5V
15 14
IC601
IC606
ERROR VOLTAGE DET
T-ON+5V
CN103A
AL+12V
PROTECT-1
CN101B
PANEL+25V
66
PANEL+3.3V
33
PANEL+10.8V
11
PANEL+25V PANEL+3.3V
LCD MAIN CBA UNIT
PANEL-6V
99PANEL-6V
PANEL+10.8V
CN103B
AL+4V(D)13 13 AL+5V(D)12 12 AL+3.3V10 10
REG+3.3V
REG+1.8V
AL+3.3V
IC101
+3.3V REG
IC102
+1.8V REG
AL+40V
TO SYSTEM CONTROL BLOCK DIAGRAM TO INVERTER BLOCK DIAGRAM
F601 T4A L 250V
Q608
Q603
Q504
Q633
Q502
Q632
Q507
Q506
-6V REG.
+5V REG. IC602
+3.3V REG.
IC605
+5V REG.
+5V REG.
Q501
+25V REG.
Q503
+10.8V REG.
Q505
PROTECT-2
AL+5V11 11 AL+5V
CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F601) is blown , check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.
NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal.
CAUTION ! For continued protection against fire hazard, replace only with the same type fuse.

7-6 L4620BLLB
LCD Backlight Block Diagram
CURRENT CONTROL SWITCH Q321
Q324
T301 CN301
LCD MODULEINVERTER CBA
BACK LIGHT BACK LIGHT BACK LIGHT
OVER VOLTAGE PROTECTOR
Q322,323
1 2
1 2
CN302 CN303
1 2
INV+22V AL+40V BACKLIGHT -ADJ PROTECT-1
9 7
3 5
2 6 1 4
10
8
TO POWER SUPPLY BLOCK DIAGRAM TO SYSTEM CONTROL BLOCK DIAGRAM
MAIN CBA
+22V77
CN404 CN304
+22V66 +22V55 +22V44 +22V88 +22V99
CURRENT CONTROL SWITCH Q341
Q344
T302
OVER VOLTAGE PROTECTOR
Q342,343
9 7
3 5
2 6 1 4
10
8
CURRENT CONTROL SWITCH Q361
Q364
T303
OVER VOLTAGE PROTECTOR
Q362,363
9 7
3 5
2 6 1 4
10
8
OVER VOLTAGE PROTECTOR
Q304
Q306
+10V REG.
OVER CURERENT PROTECTOR
Q325
Q305
PROTECT-133
Q401
Q402
Q403

8-3 L4620SCM1
Main 1/4 Schematic Diagram

8-4 L4620SCM2
Main 2/4 Schematic Diagram
CN103A
10.1
20.4
30.2
40
52.6
62.6
70
81.7
90.2
10 0
11 3.5
12 5.2
13 6.9
14 3.1
15 0
16 4.8
17 0
18 5.2
19 0
20 5.2
21 3.3
22 3.1
23 0
VOLTAGE CHART
Pin No. Voltage