Sylvania LC370SL8 User manual

SERVICE MANUAL
This service manual shows only the differences between
the model LC370SL8 and the original model LC370SS8.
All other information is described in the service manual
of the model LC370SS8.
37″COLOR LCD TELEVISION
LC370SL8
TABLE OF CONTENTS
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Different parts from the original model (LC370SS8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SUPPLEMENT

1-1
Power Supply Block Diagram
A71G1BLP
HOT
HOT
COLD
POWER SUPPLY CBA
INVERTER CBA
HOT CIRCUIT. BE CAREFUL.
TO DIGITAL MAIN CBA UNIT (CN3010)
Q602
SWITCHING
CONTROL
14
3 2
IC603
IC637
T601
CN601
TO INVERTER BLOCK DIAGRAM
CN501
4
+3.3V
REG
HOT-GND 3 ACL 1
3 1
P-ON+9V 8 P-ON+5V 6,7
+2.5V
14-16
+4V
10-12
+15V 18
AL+3.3V 4
+5V/+12V-LCD 2,3
+35V 20
F501 4A/125V
LINE FILTER
L503
AC501 AC CORD
LINE FILTER
L502
BRIDGE RECTIFIER
ACL HOT-GND
D502 - D505
4A 125V
2
16 15 10 14
9
13 12 11
7 6
SHUNT
REG
Q601
SWITCHING
Q801
AMP+13V P-ON+9V
P-ON-H
TO SYSTEM CONTROL BLOCK DIAGRAM
AL+3.3V
CN301
+9V REG
Q639,Q640
Q641
Q638
Q637
Q644
JS632
Q635
Q633
Q636
SW +13V
Q632
Q631
Q643
23
JS612
Q650
SW +5V
Q1,Q2,Q3
DIGITAL SUB CBA
TO DIGITAL MAIN CBA UNIT (CN3025)
D+1.0V-VDDC 1,2 +2.5V-UNDER 3
+2.5V 4,5
CN1
CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F501) 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.
For continued protection against risk of fire, replace only with same type 4 A, 125V fuse.
CAUTION ! : ATTENTION : Utiliser un fusible de rechange de même type de 4A, 125V.
4A/125V
NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal.
BLOCK DIAGRAMS

2-1 LC4N_SC
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS
Standard Notes
WARNING
Many electrical and mechanical parts in this chassis
have special characteristics. These characteristics
often pass unnoticed and the protection afforded by
them cannot necessarily be obtained by using
replacement components rated for higher voltage,
wattage, etc. Replacement parts that have these
special safety characteristics are identified in this
manual and its supplements; electrical components
having such features are identified by the mark “#” in
the schematic diagram and the parts list. Before
replacing any of these components, read the parts list
in this manual carefully. The use of substitute
replacement parts that do not have the same safety
characteristics as specified in the parts list may create
shock, fire, or other hazards.
Notes:
1. Do not use the part number shown on these
drawings for ordering. The correct part number is
shown in the parts list, and may be slightly
different or amended since these drawings were
prepared.
2. All resistance values are indicated in ohms
(K = 103, M = 106).
3. Resistor wattages are 1/4W or 1/6W unless
otherwise specified.
4. All capacitance values are indicated in µF
(P = 10-6 µF).
5. All voltages are DC voltages unless otherwise
specified.

2-2 LC4N_SC
LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON
THE FOLLOWING PAGES:
1. CAUTION:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME
TYPE_A,_V FUSE.
ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE_A,_V.
2. CAUTION:
Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F501) is blown, first 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.
3. Note:
1. Do not use the part number shown on the drawings for ordering. The correct part number is shown in the
parts list, and may be slightly different or amended since the drawings were prepared.
2. To maintain original function and reliability of repaired units, use only original replacement parts which are
listed with their part numbers in the parts list section of the service manual.
4. Voltage indications on the schematics are as shown below:
Plug the TV power cord into a standard AC outlet.:
5. How to read converged lines
6. Test Point Information
23
15.0 5.0
Voltage Indicates that the voltage
is not consistent here.
Power on mode
(Unit: Volt)
3
2
1
ABCD
1-B1
1-D3
AREA D3
AREA B1
1-D3
Distinction Area
Line Number
(1 to 3 digits)
Examples:
1. "1-D3" means that line number "1" goes to the line number
"1" of the area "D3".
2. "1-B1" means that line number "1" goes to the line number
"1" of the area "B1".
: Indicates a test point with a jumper wire across a hole in the PCB.
: Used to indicate a test point with a component lead on foil side.
: Used to indicate a test point with no test pin.
: Used to indicate a test point with a test pin.

2-3 A71G1SCP1
Power Supply 1/2 & Digital Sub Schematic Diagram
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
CN301
10
2 12.2
3 12.2
43.4
50
65.0
75.0
89.2
90
10 5.1
11 5.1
12 5.1
13 0
14 2.5
15 2.5
16 2.5
17 0
18 15.6
19 0
20 34.6
21 0
22 3.2
23 1.1
VOLTAGE CHART
Pin No. Voltage

2-4
Digital Main 5/9 Schematic Diagram
A71G1SCD5
1 NOTE:
The order of pins shown in this diagram is different from that of actual IC3015.
IC3015 is divided into four and shown as IC3015 (1/4) ~ IC3015 (4/4) in this Digital Main Schematic Diagram Section.

2-5
Digital Sub CBA Top & Bottom View
BA71F0F01061

WIRING DIAGRAM
A71G1WI3-1
DIGITAL SUB CBA
INVERTER CBA
FUNCTION CBA
TU3001 TUNER UNIT
AC501
AC CORD
POWER SUPPLY CBA
DIGITAL MAIN CBA UNIT
IR SENSOR CBA
1 3 2 5 4 7 6 8 9
10 13 12 11 14 15 17 16 19 18 21 20 22 23
P-ON+9V GND NU GND NU NU AUDIO(L) GND AUDIO(R) GND GND SDA1 SCL1 S-VIDEO-Y VIDEO-Pr S-VIDEO-C GND VIDEO-Pb GND GND
24
VIDEO VIDEO-Y
CN3018
GND D+5V
CN7501
1 5 3 9 7 2 4 6 8
10 14 12 18 16 11 13 15 17 19 23 21 20 22
24
CN3023
1
D+5V/+12V-LCD D+5V/+12V-LCD D+5V/+12V-LCD D+5V/+12V-LCD D+5V/+12V-LCD
2 3 4 5 6
GND GND GND
7 8 9
IX-TX3(+)
10
IX-TX3(-)
11
GND
12
IX-CLK(+)
13
IX-CLK(-)
14
GND
15
IX-TX2(+)
16
IX-TX2(-)
17
GND
18
IX-TX1(+)
19
IX-TX1(-)
20
GND
21
IX-TX0(+)
22
IX-TX0(-)
23
GND GND GND
24 25 26
VCOM
27
NU
28
GND GND GND
29 30
LCD MODULE ASSEMBLY
CN301CN3010
23 19 21 15 17 22 20 18 16 14 10 12
6 8
13 11
9 7 5 1 3 4
23 19 21 15 17 22 20 18 16 14 10 12
6 8
13 11
9 7 5 1 3 4
2
GND AL+3.3V GND P-ON+5V P-ON+5V P-ON+9V +4V GND +4V +4V +2.5V GND +2.5V +2.5V GND GND +15V +35V GND PROTECT2 PROTECT1 +5V/+12V-LCD +5V/+12V-LCD
2
CN3001
1 3 2 4 5 7 6 8
CN552
1
GND
3
PROTECT2(NU)
2
PROTECT3(NU)
4
PROTECT1
5
P-ON-H
7
BACKLIGHT-PWM
6
BACKLIGHT-ON
8
GND
PROTECT3 SCL GND SDA GND REMOTE NU AMP-STBY AMP-MUTE NU GND GND AUDIO(L)-OUT AUDIO(R)-OUT LED2 GND LED1 NU NU GND NU
CN302
P-ON-H GND
CN3014
23 19 21 15 17 22 20 18 16 14 10 12
6 8
13 11
9 7 5 1 3 4
2
23 19 21 15 17 22 20 18 16 14 10 12
6 8
13 11
9 7 5 1 3 4
2
CLN802
2
CN802
1
SP-P(L)
SP-N(L)
CLN801
2
CN801
1
SP-P(R)
SP-N(R)
SP802 SPEAKER L-CH
SP801 SPEAKER R-CH
JACK CBA
COMPONENT -Y-IN2 COMPONENT -Pb-IN2 COMPONENT -Pr-IN2
COMPONENT -Y-IN1
COMPONENT -Pb-IN1 COMPONENT -Pr-IN1
COMPONENT- AUDIO(L)-IN1 COMPONENT- AUDIO(R)-IN1 COMPONENT- AUDIO(L)-IN2 COMPONENT- AUDIO(R)-IN2
VIDEO-IN1
AUDIO(L) -IN1
AUDIO(R) -IN1
VIDEO-IN2
AUDIO(L) -IN2
AUDIO(R) -IN2
S-VIDEO -IN2 S-VIDEO -IN1
CN102 CN3002
1 3 2 4 5
GND AL+3.3V KEY-IN1 NU
6
NU KEY-IN2
1 5 3 2 4 6
CN601 CN501
1 3
1 3
2
ACL NU HOT-GND
2
CN101B CN001
1 3 2 4 5
GND REMOTE AL+3.3V NU
6
LED2 NU
6 2 4 5
7
LED1
8
NU
8 7 3 1
BACK LIGHT
CN1050
2 1
BACK LIGHT
CN1100
2 1
BACK LIGHT
CN1150
2 1
BACK LIGHT
CN1200
2 1
BACK LIGHT
CN1250
2 1
BACK LIGHT
CN1300
2 1
BACK LIGHT
CN1350
2 1
BACK LIGHT
CN1400
2 1
HDMI- AUDIO(L)-IN HDMI- AUDIO(R)-IN
AUDIO(L) -OUT AUDIO(R) -OUT
HDMI- CONNECTOR-1
DIGITAL AUDIO OUT (COAXIAL)
CN3025 CN1
1 3 2 4 5
D+1.0V-VDDC D+1.0V-VDDC +2.5V-UNDER +2.5V +2.5V
2 4 5 3 1

20070718 4-1 A71G1PL
Different parts from the original model (LC370SS8)
Ref. No. Description Part No.
MECHANICAL PARTS
A1 FRONT CABINET 37V A71G1UH 1EM021806
A4 REAR CABINET 37V A71G3UH 1EM021802
A6#RATING LABEL A71G1UH ----------
A9 STAND COVER 37V A71G1UH 1EM021807
A11 LED LENS A71A2UH 1EM322718
A14 JACK PLATE A71A1UH 1EM221627
A21 Not used
A22 Not used
B6 JACK HOLDER D A71A1UH 1EM221626
B28 Not used
B43 Not used
L19 Not used
SP801 SPEAKER MAGNETIC YDP613-23 DSD1611EFU01
SP802 SPEAKER MAGNETIC YDP613-23 DSD1611EFU01
S12 CARTON (U) A71G1UH 1EM424586
X2#OWNERS MANUAL A71G1UH 1EMN22307
X9 Not used
ELECTRICAL PARTS
DIGITAL MAIN CBA UNIT 1ESA14700
MPS CBA 1ESA14701
POWER SUPPLY CBA(MPS-1) ----------
C802
CHIP CERAMIC CAP.(1608) B K 0.47 µ F/16V CHD1CK30B474
C803
CHIP CERAMIC CAP.(1608) B K 0.47 µ F/16V CHD1CK30B474
C806
CHIP CERAMIC CAP.(1608) B K 0.047 µ F/50V CHD1JK30B473
C807
CHIP CERAMIC CAP.(1608) B K 0.047 µ F/50V CHD1JK30B473
C809
CHIP CERAMIC CAP.(1608) B K 0.047 µ F/50V CHD1JK30B473
C810
CHIP CERAMIC CAP.(1608) B K 0.047 µ F/50V CHD1JK30B473
C842
CHIP CERAMIC CAP.(1608) B K 0.47 µ F/16V CHD1CK30B474
C843
CHIP CERAMIC CAP.(1608) B K 0.47 µ F/16V CHD1CK30B474
L801 COIL RADIAL LHLP10NB680M 68µH LLF6800TU003
L802 COIL RADIAL LHLP10NB680M 68µH LLF6800TU003
L803 COIL RADIAL LHLP10NB680M 68µH LLF6800TU003
L804 COIL RADIAL LHLP10NB680M 68µH LLF6800TU003
R654 CARBON RES. 1/4W J 4.7K ΩRCX4JATZ0472
JACK CBA(MPS-4) ----------
C7515 Not used
C7516 Not used
R7515 Not used
R7516 Not used
R7517 Not used
R7518 Not used
JK7501 Not used
DIGITAL SUB CBA 1ESA15014
CN1 ANGLE PIN HEADER
IMSA6029B105Z003PT1 JTED005ER045
Q1 PNP TRANSISTOR POWER 2SA1887(F)
QQWZ2SA1887F
Q2 PNP TRANSISTOR POWER 2SA1887(F) QQWZ2SA1887F
Q3 PNP TRANSISTOR POWER 2SA1887(F) QQWZ2SA1887F
R1 METAL OXIDE FILM RES. 2W J 0.68 ΩRN02R68DP004
R3 METAL OXIDE FILM RES. 2W J 0.68 ΩRN02R68DP004
R4 METAL OXIDE FILM RES. 2W J 0.68 ΩRN02R68DP004
R5 METAL OXIDE FILM RES. 2W J 0.68 ΩRN02R68DP004
Ref. No. Description Part No.

© 2007 Funai Electric Co., Ltd.
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consent of Funai. Furthermore, any unauthorized commercial distribution of this manual or any revision hereto
is strictly prohibited.
Information in this document is subject to change without notice. Funai reserves the right to change the content
herein without the obligation to notify any person or organization of such changes.
with the design is a registered trademark of Funai Electric Co., Ltd and may not be used in any way
without the express written consent of Funai. All other trademarks used herein remain the exclusive property of
their respective owners. Nothing contained in this manual should be construed as granting, by implication or
otherwise, any license or right to use any of the trademarks displayed herein. Misuse of any trademarks or any
other content in this manual is strictly prohibited. Funai shall aggressively enforce its intellectual property rights
to the fullest extent of the law.
LC370SL8
A71G1UH
2007-08-06