Sylvania 6620LF4 User manual

SERVICE MANUAL
This service manual shows only the differences between
the model 6620LF4 and the original model EWL2005.
All other information is described in the service manual
of the model EWL2005.
20″COLOR LCD TELEVISION
6620LF4
TABLE OF CONTENTS
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Schematic Diagrams / CBA’s and Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Different parts from the original model (EWL2005). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

1-1
BLOCK DIAGRAMS
System Control Block Diagram
L3200BLS
FUNCTION CBA
IC333 (TV MICRO CONTROLLER)
3
21
KEY-IN-122
CN104 CLN104
KEY SWITCH
11
KEY-IN-1
REMOTE
RESET RESET
Q151
P-ON+3.3V(D)
42 43 X161
27MHz
XIN
XOUT
MAIN CBALCD MAIN CBA UNIT
4
KEY-IN-211
KEY-IN-2
22 18 17
BACKLIGHT-SW
19 5
BACKLIGHT-ADJ
21 3
P-ON-H16 8 VOLUME15 9 AUDIO-MUTE
13 11
INPUT-012 12 INPUT-111 13 S-SW717 SCL618 SDA519
BACKLIGHT-SW
BACKLIGHT-ADJ
P-ON-H
VOLUME
AUDIO-MUTE
SDA SCL
INPUT-0 INPUT-1
S-SW
SCL SDA
20 35 31 40 19 32 41 TO POWER SUPPLY
BLOCK DIAGRAM TO IF/VIDEO BLOCK DIAGRAM TO AUDIO BLOCK DIAGRAM
BACKLIGHT-SW
BACKLIGHT-ADJ
P-ON-H
VOLUME
AUDIO-MUTE
INPUT-0 INPUT-1
S-SW
SCL
SDA
TO LCD BACKLIGHT BLOCK DIAGRAM
CN102B CN102A
SDA 2 SCL 1
CN112(NO CONNECTION)
IC171 (MEMORY)
SCL 6
SDA 5
7
WP
Q131
3.3V<-->5V CONVERTER
BUS-OPEN 4
NO PART MOUNTED FOR CN112
23
BUS-OPEN
P-ON-H2(NU)
14 1016
P-ON-H2
12
P-25V-ON P-25V-ON
TO POWER SUPPLY BLOCK DIAGRAM
KEY SWITCH
IR SENSOR CBA
CLN105 REMOTE
SENSOR
RCV91
AL +5V
D91
POWER
Q91
P-ON-H44
CN105 REMOTE33
INVERTER CBA
BACKLIGHT-ADJ
99
CN411 CLN411
BACKLIGHT-SW
88
P-ON-H11 11 P-ON-H
AFT-IN10 145AFT-IN
80
TUNERCLK
Q301
BUFFER AFT-IN
BUS-OPEN519
CN103B CN103A
CN113 (NO CONNECTION)
SDA
2SCL 1
BUS-OPEN
4CN113 IS USED
FOR ADJUSTMENT AT FACTORY
P-ON-H
FSC123
FSC

2-1 LC2N_SC
SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS
Standard Notes
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.
Note of Capacitors:
ML --- Mylar Cap. PP --- Metallized Film Cap. SC --- Semiconductor Cap. L --- Low Leakage type
Temperature Characteristics of Capacitors are noted with the following:
B --- ±10% CH --- 0±60 ppm/°C CSL --- +350~-1000 ppm/°C
Tolerance of Capacitors are noted with the following:
Z --- +80~-20%
Note of Resistors:
CEM --- Cement Res. MTL --- Metal Res. F --- Fuse Res.
Capacitors and transistors are represented by the following symbols.
(Top View) (Bottom View)
(Bottom View)
Electrolytic Capacitor
+
Transistor or Digital Transistor
NPN Transistor PNP Transistor
NPN Digital Transistor PNP Digital Transistor
(Top View)
(Top View)
E C B
E C B
Digital Transistor
CBA Symbols Schematic Diagram Symbols
E C B
(Top View)
(Top View)
E C B
E C B

2-2 LC2N_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 (F601) 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
(3.0) 5.0 (3.0)
Voltage Indicates that the voltage
is not consistent here.
Power on mode
Power off 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 L3200SCIR
IR Sensor Schematic Diagram

2-4
BL3100F01021-3
Function CBA Top View
Function CBA Bottom View
IR Sensor CBA Top & Bottom View
BL3100F01021-2
BL3100F01021-2

20050519 3-1 T3200PL
Different parts from the original model (EWL2005)
Ref. No. Description Part No.
MECHANICAL PARTS
A1 FRONT CABINET L3200UA 1EM020185
A2 BRAND BADGE L0200UA~SYLVANIA~ 0EM409019
A3 CONTROL PLATE L0301UB 1EM220019
A4 REAR CABINET L3200UA 1EM020138
A5 Not Used
A6#RATING LABEL L3200UA ----------
A7 FUNCTION KNOB L0301UB 1EM220005A
A8 REAR COVER L3207UH 1EM420953
A9 TILT STAND ASSEMBLY L0301UB 1EMN20039
A10 CONNECTOR CAP L3200UA 1EM420645
A11 SENSOR/LED LENS L0301UB 1EM220004
B1 SPEAKER HOLDER L0110UA 0EM407855C
B3 STAND HOLDER L0200UA 0EM301999B
B6 CLOTH(15X190XT 0.5) L0100JA 0EM407894
B8 Not Used
B12 20V TILT STAND HOLDER L4200EA 1EM320145
B21 CLOTH(10X180XT0.5) L0336JG 0EM408827
B22 INSULATION PLATE L3207UH 1EM421108
B23 CAUTION LABEL L3207UH ----------
CLN801 SPEAKER WIRE ASSEMBLY 2P WIRE ASSEMBLY WX1L3201-001
CLN802 SPEAKER WIRE ASSEMBLY 2P WIRE ASSEMBLY WX1L3201-001
L7 Not Used
L18 DOUBLE SEMS SCREW M4X12 + BLAK FPK34120
SP801 SPEAKER S0407F10 DSD0807XQ002
SP802 SPEAKER S0407F10 DSD0807XQ002
S1 CARTON L3200UA 1EM420656
S2 STYROFOAM TOP L0301UB 1EM020018A
S3 STYROFOAM BOTTOM L0301UB 1EM020019A
S4 SET BAG L3207UH 1EM320295
S6 STYROFOAM STAND BOTTOM L0301UB 1EM020020A
X2#OWNERS MANUAL L3200UA 1EMN20336
ELECTRICAL PARTS
LCD MAIN CBA & LIQUID CRYSTAL PANEL UNIT 1FSA10052
MMA CBA (IR SENSOR CBA is not included.) 1ESA10860
ANALOG INVERT PCB ASSEMBLY 1ESA10861
FUNCTION CBA ----------
CLN104 5P-8P WIRE ASSEMBLY 5P-8P WIRE ASSEMBLY WX1L3201-006
IR SENSOR CBA ----------
C91 ELECTROLYTIC CAP. 47µF/ 10V M H7 CE1AMASSL470
D91 LED L-53HT NP4Z000L53HT
CLN105 5P WIRE ASSEMBLY 5P WIRE ASSEMBLY WX1L3201-004
Q91 TRANSISTOR 2SC4081 T106 Q QQ1Q02SC4081
R91 CARBON RES. 1/4W J 10k ΩRCX4JATZ0103
R92 CHIP RES.(1608) 1/10W J 68 ΩRRXAJR5Z0680
R93 CARBON RES. 1/4W J 68 ΩRCX4JATZ0680
R94 CARBON RES. 1/4W J 150 ΩRCX4JATZ0151
R95 CHIP RES.(1608) 1/10W J 150 ΩRRXAJR5Z0151
R96 CHIP RES.(1608) 1/10W J 10k ΩRRXAJR5Z0103
JS91 CHIP RES.(1608) 1/10W 0 ΩRRXAZR5Z0000
JS93 CHIP RES.(1608) 1/10W 0 ΩRRXAZR5Z0000
JS94 CHIP RES.(1608) 1/10W 0 ΩRRXAZR5Z0000
RCV91 PHOTO LINK MODULE KSM-712TH2E USESJRSKK044

6620LF4
L3200UA
2005-06-10

SERVICE MANUAL
This service manual is for the 6620LF4 different
LCD Module Assembly model, which is different
from the previous 6620LF4 model.
For 6620LF4 different LCD Module Assembly
model, an “C” or the letter (L3220UA) is printed
on rating label on the back of the unit. Refer to
the rating label illustration at right.
Rating Label
"L3220UA" Suffix "C"
20″COLOR LCD TELEVISION
6620LF4

IMPORTANT SAFETY NOTICE
Proper service and repair is important to the safe, reliable operation of all
Funai Equipment. The service procedures recommended by Funai and
described in this service manual are effective methods of performing
service operations. Some of these service special tools should be used
when and as recommended.
It is important to note that this service manual contains various CAUTIONS
and NOTICES which should be carefully read in order to minimize the risk
of personal injury to service personnel. The possibility exists that improper
service methods may damage the equipment. It also is important to
understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE.
Funai could not possibly know, evaluate and advice the service trade of all
conceivable ways in which service might be done or of the possible
hazardous consequences of each way. Consequently, Funai has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a
service procedure or tool which is not recommended by Funai must first
use all precautions thoroughly so that neither his safety nor the safe
operation of the equipment will be jeopardized by the service method
selected.
TABLE OF CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Cabinet Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Electrical Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
How to initialize the LCD Television . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Schematic Diagrams / CBA’s and Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Exploded Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
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.