FUNAI LCD-B1504 User manual

15″/20″COLOR LCD TELEVISION
LCD-B1504
LCD-B2004
The LCD panel is manufactured to provide many years of useful life.
Occasionally a few non active pixels may appear as a tiny spec of color.
This is not to be considered a defect in the LCD screen.

4-3 L4101DC
Wiring Diagram
Fig. D3
T402 CN101A CN102A
CN31A
CN31B
CN801 CN802
To Speaker
To LCD Module
Assembly
To LCD Module Assembly
Function CBA
Main CBA
LCD Main CBA
To Speaker
CN103A
CN101B
CN320A CN321A
CN102B CN103B
T401

4-6 L4201DC
Cable Wiring Diagram
Fig. D3
T1402 CN101A CN102A
CN53
CN405
CN1401
CN51
CN51A
CN801 CN802
To Speaker
To LCD Module Assembly
Function CBAIR Sensor CBA
Inverter CBA Main CBA
LCD Main CBA
To Speaker
CN103A
CN101B
CN310A CN311A CN313A
CN102B CN103B
T1401
T1404
To LCD
Module
Assembly
To LCD
Module
Assembly
T1403

5-1 L4100INT
HOW TO INITIALIZE THE LCD TELEVISION
To put the program back at the factory-default,
initialize the LCD television as the following procedure.
How to initialize the LCD television:
1. Turn the power on. (Use main power on the TV
unit.)
2. To enter the service mode, press [STANDBY], [2],
[7], [1], and [MUTE] buttons on the remote control
unit in that order within 5 seconds.
- To cancel the service mode, press [STANDBY]
button on the remote control.
3. To initialize the LCD television, press “DISPLAY”
button on the remote control unit.
4. Confirm "FF" indication on the upper right of the
screen.

6-1 L4101EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
“CBA” is abbreviation for “Circuit Board Assem-
bly.”
NOTE:
Electrical adjustments are required after replacing
circuitcomponentsandcertainmechanicalparts.Itis
importantto perform these adjustments only after all
repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. DC Voltmeter
2. Pattern Generator
3. Color Analyzer
How to Set up the Service mode:
1. Turn the power on. (Use main power on the TV
unit.)
2. Press [STANDBY], [2], [7], [1], and [MUTE] buttons
on the remote control unit in that order within 5
seconds.
- To cancel the service mode, press [STANDBY]
button on the remote control.
1. Initial Setting
General
Enter the Service mode.
Set the each initial data as shown on table 1 below.
Table 1: Initial Data
ITEM BUTTON (on the remote
control)
DATA VALUE
LCD-
B1504 LCD- B2004
BRT(PAL)
MENU →1
130 134
CNT(PAL) 174 174
CLR-R(PAL) 78 74
CLR-B(PAL) 78 74
SHR(PAL) 143 143
S-BRT(PAL)
MENU →2
130 134
S-CNT(PAL) 174 174
S-CLR-R(PAL) 78 74
S-CLR-B(PAL) 78 74
S-SHR(PAL) 143 143
C-BRT(PAL)
MENU →3
134 134
C-CNT(PAL) 122 132
C-CLR-R(PAL) 156 154
C-CLR-B(PAL) 156 154
C-SHR(PAL) 143 143
BRT(SECAM)
MENU →4
130 134
CNT(SECAM) 174 174
CLR-R(SECAM) 78 74
CLR-B(SECAM) 78 74
SHR(SECAM) 143 143
S-BRT(SECAM)
MENU →5
130 134
S-CNT(SECAM) 174 174
S-CLR-R(SECAM) 78 74
S-CLR-B(SECAM) 78 74
S-SHR(SECAM) 143 143
C-BRT(SECAM)
MENU →6
134 134
C-CNT(SECAM) 122 132
C-CLR-R(SECAM) 156 154
C-CLR-B(SECAM) 156 154
C-SHR(SECAM) 143 143
BRT(NTSC)
MENU →7
134 134
CNT(NTSC) 172 174
CLR-R(NTSC) 78 70
CLR-B(NTSC) 78 70
TNT(NTSC) 148 148
SHR(NTSC) 143 143
S-BRT(NTSC)
MENU →8
134 134
S-CNT(NTSC) 172 174
S-CLR-R(NTSC) 78 70
S-CLR-B(NTSC) 78 70
S-TNT(NTSC) 148 148
S-SHR(NTSC) 143 143

6-2 L4101EA
2. +B Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Note: TP401(+B), TP300(GND), VR649 --- Main CBA
1. Connect DC Volt Meter to TP401 and
TP300(GND).
2. Adjust VR649 so that the voltage of TP401
becomes +13.0±0.3V DC [LCD-B1504] or
+21.0±0.3V DC [LCD-B2004].
3. Flicker Adjustment
Adjustment Point: R977 (LCD Main CBA)
1. Enter the Service mode.
2. Press “2” button on the remote control unit.
The following screen appears.
3. If Flicker Adjustment is not fit, the screen become
the following.
4. Adjust R977 so that flash stops.
C-BRT(NTSC)
MENU →9
134 134
C-CNT(NTSC) 122 132
C-CLR-R(NTSC) 156 154
C-CLR-B(NTSC) 156 154
C-TNT(NTSC) 148 148
C-SHR(NTSC) 143 143
BRIGHT 0 0 0
NORMAL 0 40 65
DARK 0 95 98
COR(C/D/S-1) VOL. p→1 131 131
COG(C/D/S-1) VOL. p→2 131 131
COB(C/D/S-1) VOL. p→3 131 131
DR(C/D/S-1) VOL. p→4 145 145
DG(C/D/S-1) VOL. p→5 143 143
DB(C/D/S-1) VOL. p→6 140 140
SBR(C/D/S-1) VOL. p→70 0
SBB(C/D/S-1) VOL. p→90 0
C-COR(C/D/S-2) VOL. p→1 131 131
C-COG(C/D/S-2) VOL. p→2 131 131
C-COB(C/D/S-2) VOL. p→3 131 131
C-DR(C/D/S-2) VOL. p→4 145 145
C-DG(C/D/S-2) VOL. p→5 143 143
C-DB(C/D/S-2) VOL. p→6 140 140
C-SBR(C/D/S-2) VOL. p→70 0
C-SBB(C/D/S-2) VOL. p→90 0
7F
VOL. p
FF FF
LAST POWER OFF OFF
SYSTEM PAL-I PAL-I
NCM ON ON
ASPECT OFF OFF
RUSSIAN OFF OFF
Test Point Adj. Point
TP401 (+B)
TP300 (GND) VR649
M. EQ. Spec.
DC Voltmeter +13.0±0.3V DC [LCD-B1504]
+21.0±0.3V DC [LCD-B2004]
ITEM BUTTON
(on the remote
control)
DATA VALUE
LCD-
B1504 LCD- B2004
R977
LCD Main CBA
FLASH
(Go and Off)

7-1
System Control Block Diagram
L4101BLS
BLOCK DIAGRAMS
KEY-IN-144
CN31B
KEY-IN-233
RCV30
REMOTE
SENSOR
CN31A
FUNCTION CBA
KEY-IN-144
CN51A
KEY-IN-233
IR SENSOR CBA
CLN53 RCV51
D51
RCV-IN33 REMOTE
SENSOR
IC151 (MICRO CONPUTER)
93
10
52 89 59 22
KEY-IN-144
CN103B CN103A
RCV-IN11 BACKLIGHT-SW
33
BACKLIGHT-ADJ
22
P-ON-H66 PROTECT-113 13 PROTECT-214 14 VOLUME77 A-MUTE(NU)
88
INPUT-099 INPUT-110 10 S-SW15 15 SCL18 18 SDA19 19
16
KEY-IN-1
RCV-IN
RESET
P-ON-H
PROTECT-1 PROTECT-2
VOLUME
SDA
SCL
INPUT-0 INPUT-1
S-SW
SCL
SDA
88 24 77 46 27 78 45 28
13 11
X151 10MHz
XIN
XOUT
TO POWER SUPPLY BLOCK DIAGRAM TO AUDIO BLOCK DIAGRAM
BACKLIGHT-SW
BACKLIGHT-ADJ
P-ON-H
PROTECT-1 PROTECT-2
VOLUME
A-MUTE
INPUT-0 INPUT-1
S-SW
SCL
SDA
MAIN CBALCD MAIN CBA UNIT
92
KEY-IN-255
KEY-IN-2
CN51 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
26BUS-OPEN(NU)
AL+5V
AL+5V
CN105 IS USED FOR ADJUSTMENT AT FACTORY
SCLK 3 BUSY 2 RXD 4
CN104(NO CONNECTION)
EPM(NU) 6 CE(NU) 5 CNVSS 9 RESET 8 TXD 10
DVP-SOUT
DVP-CS
DVP-SIN
MPSEL-0
DVP-CLK
DVP-RESET-PC
QH
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
REG+3.3V
2 5
19
2DVP-SOUT 2DVP-CS 2DVP-CLK
42DVP-SIN 3
79
H-SYNK 2DVP-RESET
30 39 31 44 32
91 90
7
56
29
AFT-IN11 11 P-ON-H222 22
AFT-IN
P-ON-H2
PROTECT-3 PROTECT-316 16
BUS-OPEN(NU)
20 20
23 SLOW-SW19 19
SP-MUTE20 20 FBIN25 25
1
SLOW-SW-IN
SP-MUTE 84INSEL-MUTE
87 RAPID-SW18 18
RAPID-SW-IN
20 83 85 25 58
INSEL-MUTE
17 17
P-ON-L(NU)24 24 RGB-CONTROL(NU)
26 26
P-25V-ON23 23
NICAM-RESET
22 22
P-ON-L(NU)
RGB-CONTROL(NU)
P-25V-ON
SC-VIDEO-MUTE
NICAM-RESET
S/C-JACK-MUTE
16 16
33 34 EEP-SCL
EEP-SDA S/C-JACK-MUTE
PROTECT-3
P-ON-H2
SP-MUTE
INSEL-MUTE
NICAM-RESET
FBIN
RAPID-SW
SLOW-SW
S/C-JACK-MUTE
TO IF/VIDEO BLOCK DIAGRAM
AFT-IN
BUSY-FLASH SCLK-FLASH RXD-FLASH CE-FLASH(NU) EPM-FLASH(NU) CNVSS TXD-FLASH
IC301
(LCD DRIVE / SIGNAL PROCESS)
58 50 60 57 59 83 89
7
RCV-IN77
KEY SWITCH
KEY SWITCH
KEY SWITCH KEY SWITCH
P-25V-ON
5
D30
STAND BY
AL+5V
INVERTER CBA
CN1401
BACKLIGHT-SW
10 10
BACKLIGHT-ADJ
11 11
CN405
PROTECT-112 12
P-ON-H13 13
TO LCD BACKLIGHT BLOCK DIAGRAM (B)
B A
FUNCTION CBA
BACKLIGHT-ADJ
BACKLIGHT-SW
PROTECT-1 TO LCD BACKLIGHT
BLOCK DIAGRAM (A)
BACKLIGHT-SW
BACKLIGHT-ADJ
PROTECT-1
P-ON-H
A
Comparison Chart of Models & Marks
Model Mark
LCD-B1504 LCD-B2004 A
B
STAND BY

7-2
IF/Video Block Diagram
L4101BLIF
JK751
15
11
7
VIDEO-Pb
VIDEO-Y
VIDEO-Pr
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 BLOCK DIAGRAM (A),(B) CN103B
IC781 (INPUT SELECT)
Q754
Q702
Q701 SW
CONTROL
10
911
INPUT-0 INPUT-1
TO SYSTEM CONTROL BLOCK DIAGRAM
Q872 Q871
Q753 Q752 Q751
(TUNER UNIT)
BUFFER
BUFFER BUFFER BUFFER
BUFFER
BUFFER
WF7 WF2 WF3
WF6 WF5 WF4
3 54
CVBS18 S-VIDEO-C5 S-VIDEO-Y6 VIDEO-Pr1 VIDEO-Y2 VIDEO-Pb3 CVBS29
8
19 20
VIDEO-IN
VIDEO-OUT
SLOW-SW
17 16
16RAPID-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
Q744
Q792
AL+5V
Q743
BUFFER

7-3
Audio Block Diagram
L4101BLA
MAIN CBA
AUDIO SIGNAL
VOLUME
TO SYSTEM CONTROL BLOCK
INPUT-0(INV) INPUT-1(INV)
SCL
SDA
IC871 (INPUT SELECT)
SW CTL
3
11 15 12
4 1
9 10
dBX/MNR PANDA1 FM/AM
PRESCALE
I2C READ REGISTER
AUTOMATIC SOUND SELECT
NICAM PRESCALE
L-CH R-CH
VOLUME
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 5
RF
JK801 HEADPHONE JACK
CN801
SP-R 1
GND 2
SP802 SPEAKER L-CH
CN802
SP-L 1
GND 2
TO IF/VIDEO BLOCK DIAGRAM
13
2
WF1
CLN802 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 AL+5V
INSEL-MUTE
S/C-JACK-MUTE SP-MUTE
DEEMPHASIS
SOUND SELECT
A/D CONVERTER
SCART DSP INPUT SELECT SCART
PRESCALE
D/A CONVERTER VOLUME
SCART1 OUTPUT SELECT SCART1
CHANNEL MATRIX
QUASI-PEAK CHANNEL MATRIX
I2C READ REGISTER
30 31
QUASI-PEAK DETECTOR
LOUD SPEAKER CHANNEL MATRIX
AVC
D/A CONVERTER
STANDERD AND SOUND DETECTION

7-4 L4101BLLCD
LCD Block Diagram ( A )
LCD MAIN CBA UNIT
VIDEO SIGNAL
IC301 (LCD DRIVE / SIGNAL PROCESS)
TO IF/VIDEO BLOCK DIAGRAM CN103A
CN103B
182 181 180 179 175 174 173
ODDINV EVENINV STH1 POL
STV1 CLKV
CLKH1
LCD MODULE
VREF(4) 25 VREF(0) 29 VREF(1) 28 VREF(2) 27 VREF(3) 26 VREF(7) 21 VREF(5) 23 VREF(6) 22 VREF(8) 20 VREF(9) 19
104 105 103
VCOM 35 VCOM 36
PANEL+10.8V
R977
VCOM
CN320A
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
CN321A
OR(3)
32 OR(4) 31 OR(5) 30
OR(0)
35 OR(1)
34 OR(2) 33
OG(3)
25 OG(4) 24 OG(5) 23
OR(0)
28 OG(1) 27 OG(2) 26
OB(3)
18 OB(4) 17 OB(5) 16
OB(0)
21 OB(1) 20 OB(2) 19
ER(3)
5ER(4) 4ER(5) 3
ER(0)
8ER(1) 7ER(2) 6
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-Pb 3
VIDEO-Pr 1
VIDEO-Y 2
VCOM 3 VCOM 4
CN321A
84 85
X301 54MHz
XIN XOUT
CLEAR 15
CLKV 14 VCOM
CONTROL
Q971 IC981,
CLEAR
91
95 96
98
STV1 13
LP 44
CN320A
POL 43
HMS1-E 10
CLKH 12
STH1 42
HMS1-O 14
WF11
WF10 WF12WF9
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
LP
97
187
WF14WF13
Comparison Chart of Models & Marks
Model Mark
LCD-B1504 LCD-B2004 A
B
B G R B G R
R905
R907 R901 R904
R902
R997

7-5
LCD Block Diagram ( B )
L4201BLLCD
CN310A
LCD MAIN CBA UNIT
VIDEO SIGNAL
IC301 (LCD DRIVE / SIGNAL PROCESS)
TO IF/VIDEO BLOCK DIAGRAM CN103A
CN103B
182 181 180 179 175 174 173
CN311A
ODDINV EVENINV STH1 POL LP CLKH1
LCD MODULE
VREF(4) 10 VREF(0) 14 VREF(1) 13 VREF(2) 12 VREF(3) 11 VREF(7) 6 VREF(5) 8 VREF(6) 7 VREF(8) 5 VREF(9) 4
104 105
OR(0)29 OR(1)28 OR(2)27 OR(3)26 OR(4)25 OR(5)24 OG(0)22 OG(1)21 OG(2)20 OG(3)19 OG(4)18 OG(5)17 OB(0)15 OB(1)14 OB(2)13 OB(3)12 OB(4)11 OB(5)10
ER(0)39 ER(1)38 ER(2)37 ER(3)36 ER(4)35 ER(5)34 EG(0)32 EG(1)31 EG(2)30 EG(3)29 EG(4)28 EG(5)27 EB(0)25 EB(1)24 EB(2)23 EB(3)22 EB(4)21 EB(5)20
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
CVBS1 8 CVBS2 9
S-VIDEO-C 5 S-VIDEO-Y 6
VIDEO-Pb 3
VIDEO-Pr 1
VIDEO-Y 2
VCOM 17 VCOM 18
97 95 96
STV1 CLKV
103
CN311A
CN313A
STV1 14
CLKV 16
VCOM 1 VCOM 2
98
EVENINV 2
ODDINV 8
CLKH 5
CN310A
STH1 37
POL 38
LP 39
WF14
WF13
WF11
WF10 WF12WF9
PANEL+10.8V
R977
VCOM
VCOM CONTROL Q971 IC981,
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
84 85
X301 54MHz
XIN XOUT
33 44
13 42 40
21
31
91
Comparison Chart of Models & Marks
Model Mark
LCD-B1504 LCD-B2004 A
B
B G R B G R
R905
R907
R901 R904
R902
R994

7-6 L4101BLP
Power Supply Block Diagram
CAUTION !
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE T 4A , 250 V FUSE.
NOTE : The voltage for parts in hot circuit is measured using hot GND as a common terminal.
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.
LINE FILTER
L601
AC601 AC CORD
BRIDGE RECTIFIER
D605
HOT COLD
T601
11
9
12
14
15 16
7
4 3
1 2
MAIN CBA
CN101A
Q505
Q504
Q503
HOT CIRCUIT. BE CAREFUL.
5 3 2
Q511
Q502
Q501
REG+5V
AL+3.3V
AL+8V
PROTECT-1
+12V
AL+33V
P-ON-H
Q506
Q633
PROTECT-2
IC631
+5V REG
10 13
IC504
+3.3V REG
IC601
ERROR VOLTAGE DET Q507
Q512
VR649
TP401
+B
Q510
4 1 2
7
5
6
PROTECT-3
CN103A
AL+5V
P-ON-H2
AL+13V
Q508
CN101B
PANEL+25V
77
PANEL+3.3V
44
PANEL+10.8V
11
PANEL+25V PANEL+3.3V
LCD MAIN CBA UNIT
PANEL-6V
10 10 PANEL-6V
PANEL+10.8V
CN103B
AL+8V14 14 AL+5V13 13 AL+3.3V11 11
REG+3.3V
AL+5V
AL+8V15 15
REG+1.8V
AL+3.3V
IC101
+3.3V REG
IC102
+1.8V REG
Q511
SWITCHING REGULATOR IC602
+B ADJ
P-25V-ON
AL+21V
TO LCD BACKLIGHT BLOCK DIAGRAM (A)
TO LCD BACKLIGHT BLOCK DIAGRAM (B)
4 3
1 2
+8V REG
IC503
IC603
ERROR VOLTAGE DET
IC507
+5V REG
INVERTER CBA
AL+21V33 AL+21V22 AL+21V11 AL+21V44
CN405 CN1401
P-ON-L
B
Comparison Chart of Models & Marks
Model Mark
LCD-B1504 LCD-B2004 A
B
B
B
B
A
A
F601 T4A L 250V
Q603
Q602
D505 SHUNT REGULATOR
(
(
D525
SHUNT REGULATOR
(
(
D649 SHUNT REGULATOR
(
(

7-7 L4101BLLB
LCD Backlight Block Diagram ( A )
T401
3
4
BACK LIGHT
CN401
2
1
2
5
1
610
9
7 8
OVER VOLTAGE PROTECTOR
Q423,Q427
OVER VOLTAGE PROTECTOR
Q424,Q428
T402
3
4
2
5
1
610
9
7 8
BACK LIGHT
CN402
2
1
SWITCHING
Q425,Q426
SWITCHING
Q421,Q422
OVER CURRENT PROTECTOR
Q462
PWM CONTOROL
Q468
BACKLIGHT-ADJ
OVER VOLTAGE PROTECTOR
Q464
+
Q461 Q460
+12V SWITCHING
Q466
BACKLIGHT-SW
SWITCHING BACKLIGHT-ON
Q469
PROTECT-1
LCD MODULE
MAIN CBA
AL+13V
Q463
TO POWER SUPPLY BLOCK DIAGRAM
SWITCHING BACKLIGHT-ON
Q467
Q471
Q470
TO SYSTEM CONTROL BLOCK DIAGRAM
Comparison Chart of Models & Marks
Model Mark
LCD-B1504 LCD-B2004 A
B

7-8
LCD Backlight Block Diagram ( B )
L4201BLLB
SW/ SW CTL
BACKLIGHT-SW
RL1401
Q1405, Q1406
IC1401 (DC-AC INVERTER CONTROL)
Q1403
Q1402
VCC
1 2
T1401
CN1402
LCD MODULEINVERTER CBA
BACKLIGHT-ADJ PROTECT-1
SW/ SW CTL
Q1407, Q1408
Q1401
BACK LIGHT BACK LIGHT BACK LIGHT BACK LIGHT
26 27 23 24 28 14 11
9
13 12
1
15 16
+10V REG.
OUTPUT LOGIC1 OUTPUT LOGIC2
LOGIC
OVER VOLTAGE PROTECT
SLOW START
OSC
PWM2 PWM1
STANDBY PROTECT MODE SW
4 5 7
OVER VOLTAGE PROTECTOR
Q1410,1411
OVER VOLTAGE PROTECTOR
Q1412,1413
T1402 CN1403
OVER VOLTAGE PROTECTOR
Q1414,1415
1 2
T1403 CN1404
OVER VOLTAGE PROTECTOR
Q1416,1417
OVER VOLTAGE PROTECTOR
Q1418,1419
T1404 CN1405
OVER VOLTAGE PROTECTOR
Q1420,1421
1 2
10
9 7
3 1
6 4 2 5
10
8
9 7
3 1
6 4 2 5
10
8
9 7
3 1
6 4 2 5
10
8
9 7
3 1
6 4 2 5
10
8
TO POWER SUPPLY BLOCK DIAGRAM AL+21V
P-ON-H
1 2
IC1402 (AMP)
IC1403 (AMP)
17 2
6
5 3
+
-
+
-
+
-
+
-
+
-
+
-
8
1314
9
1012
17
26
35
TO SYSTEM CONTROL BLOCK DIAGRAM
Comparison Chart of Models & Marks
Model Mark
LCD-B1504 LCD-B2004 A
B

L4101SCM1
8-3
Main 1/4 & IR Sensor Schematic Diagram Comparison Chart of
Models and Marks
MODEL MARK
LCD-B1504 A
LCD-B2004 B

L4101SCM2
Main 2/4 Schematic Diagram
8-4

L4101SCM3
Main 3/4 Schematic Diagram
8-5
Comparison Chart of
Models and Marks
MODEL MARK
LCD-B1504 A
LCD-B2004 B

L4101SCM4
Main 4/4 Schematic Diagram
8-6
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.
CAUTION !
For continued protection against fire hazard,
replace only with the same type fuse.
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
Comparison Chart of
Models and Marks
MODEL MARK
LCD-B1504 A
LCD-B2004 B

L4101SCF
Function Schematic Diagram ( A )
8-7
Comparison Chart of
Models and Marks
MODEL MARK
LCD-B1504 A
LCD-B2004 B

8-8
Function Schematic Diagram ( B )
L4201SCF
Comparison Chart of
Models and Marks
MODEL MARK
LCD-B1504 A
LCD-B2004 B