Read Sharp LC-37GE1E (serv.man12) Service Manual online
SERVICE MANUAL
LC-37GE1E
No. S66U1LC37GE1E
LC-37GE1E
MODEL
CONTENTS
Parts marked with "
" are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the
safety and performance of the set.
CHAPTER 1. IMPORTANT SERVICE SAFETY PRE-
CAUTION
[1] IMPORTANT SERVICE SAFETY PRE-
CAUTION
[1] IMPORTANT SERVICE SAFETY PRE-
CAUTION ....................................................... 1-1
[2] Precautions for using lead-free solder ........... 1-2
CHAPTER 2. SPECIFICATIONS
[1] SPECIFICATIONS ......................................... 2-1
[1] SPECIFICATIONS ......................................... 2-1
CHAPTER 3. OPERATION MANUAL
[1] OPERATION
[1] OPERATION
MANUAL .................................. 3-1
CHAPTER 4. DIMENSIONS
[1] DIMENSIONS ................................................ 4-1
[1] DIMENSIONS ................................................ 4-1
CHAPTER 5. REMOVING OF MAJOR PARTS
[1] REMOVING OF MAJOR PARTS ................... 5-1
[1] REMOVING OF MAJOR PARTS ................... 5-1
CHAPTER 6. ADJUSTMENT PROCEDURE (Signal
Line)
[1] ADJUSTMENT PROCEDURE (Signal
Line)
[1] ADJUSTMENT PROCEDURE (Signal
Line) ............................................................... 6-1
CHAPTER 7. TROUBLE SHOOTING TABLE
[1] TROUBLE SHOOTING TABLE...................... 7-1
[1] TROUBLE SHOOTING TABLE...................... 7-1
CHAPTER 8. FUNCTIONS OF MAJOR Ics (VIDEO
PROCESSOR)
[1] FUNCTIONS OF MAJOR Ics (VIDEO
PROCESSOR)
[1] FUNCTIONS OF MAJOR Ics (VIDEO
PROCESSOR) ..............................................8-1
CHAPTER 9. OVERALL WIRING/BLOCK DIAGRAM
[1] OVERALL WIRING DIAGRAM......................9-1
[2] SYSTEM BLOCK DIAGRAM.........................9-3
[3] POWER BLOCK DIAGRAM ..........................9-5
[1] OVERALL WIRING DIAGRAM......................9-1
[2] SYSTEM BLOCK DIAGRAM.........................9-3
[3] POWER BLOCK DIAGRAM ..........................9-5
CHAPTER 10. PRINTED WIRING BOARD
[1] MAIN
[1] MAIN
Unit ....................................................10-1
[2] POWER
Unit................................................10-5
[3] AV
Unit.........................................................10-9
[4] KEY
Unit ....................................................10-12
[5] R/C,
LED
Unit ............................................10-13
[6] DIGITAL TUNER Unit ................................10-14
[7] DIGITAL
[7] DIGITAL
Unit .............................................10-16
[8] SPEAKER L/R Unit....................................10-20
CHAPTER 11. SCHEMATIC DIAGRAM
[1] SCHEMATIC
[1] SCHEMATIC
DIAGRAM .............................. 11-1
Parts Guide
TopPage
LCD COLOR TELEVISION
LC-37GE1E
1 – 1
LC-37GE1E
Service Manual
CHAPTER 1.
IMPORTANT SERVICE SAFETY PRECAUTION
[1] IMPORTANT SERVICE SAFETY PRECAUTION
1. WARNING
1. For continued safety, no modification of any circuit should be attempted.
2. Disconnect AC power before servicing.
2. BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)
Before returning the receiver to the user, perform the following safety checks:
1. Inspect all lead dress to make certain that leads are not pinched, and check that hardware is not lodged between the chassis and other metal parts
in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulation materials, cabinet backs, adjustment and compartment covers or
shields, isolation resistor-capacitor networks, mechanical insulators, etc.
3. To be sure that no shock hazard exists, check for leakage current in the following manner.
• Plug the AC cord directly into a 220 - 240 volt AC outlet. (Do not use an isolation transformer for this test).
• Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15
μF capacitor in series with all exposed metal cabinet parts and a
known earth ground, such as electrical conduit or electrical ground connected to an earth ground.
• A true RMS reading multimeter should be used for this test, especially where the equipment uses a switch mode power supply which may result in
very non-sinusoidal leakage current.
• Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control
shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor.
All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the pur-
pose of completing these checks.)
Any reading of 1.75 Vrms (this corresponds to 0.7 mA. peak AC.) or more is excessive and indicates a potential shock hazard which must be cor-
rected before returning the monitor to the owner.
All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the pur-
pose of completing these checks.)
Any reading of 1.75 Vrms (this corresponds to 0.7 mA. peak AC.) or more is excessive and indicates a potential shock hazard which must be cor-
rected before returning the monitor to the owner.
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
SAFETY NOTICE
Many electrical and mechanical parts in LCD color television have special safety-related characteristics. These characteristics are often not evident
from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features
from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features
are identified by "
" . For continued protection, replacement parts must be identical to those used in the original circuit.
The use of a substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown
in this service manual, may create shock, fire or other hazards.
in this service manual, may create shock, fire or other hazards.
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the
servicing guidelines which follow:
servicing guidelines which follow:
CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF
FIRE REPLACE ONLY WITH SAME TYPE
F701 (4A / 250V)
DVM
AC SCALE
1.5k ohm
10W
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
0.15
μF
TEST PROBE
LC-37GE1E
1 – 2
[2] Precautions for using lead-free solder
1. Employing lead-free solder
• ALL "PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals.
The alphabetical character following LF shows the type of lead-free solder.
Example:
• For the Inverter PWB Units the type used in nickel, so they are marked as LFn:.
2. Using lead-free wire solder
• When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause dam-
age or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40
°C, we recommend you to use a dedicated soldering
bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our service station or service branch in your area.
3. Soldering
• As the melting point of lead-free solder (Sn-Ag-Cu) is about 220
°C which is higher than the conventional lead solder by 40 °C, and as it has poor
solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, Since the land may be
peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the
steady soldering condition.
peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the
steady soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as
required.
required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
• Be careful when replacing parts with polarity indication on the PWB silk.
Lead-free wire solder for servicing
Part No,
Description
Code
ZHNDAi123250E
J
φ0.3mm 250g(1roll)
BL
ZHNDAi126500E
J
φ0.6mm 500g(1roll)
BK
ZHNDAi12801KE
J
φ1.0mm 1kg(1roll)
BM
L
F a
Indicates lead-free solder of tin, silver and copper.
L
F
Indicates lead-free solder of tin, silver and nickel.
n
Sn-Ag-Ni
LC-37GE1E
2 – 1
LC-37GE1E
Service Manual
CHAPTER 2.
SPECIFICATIONS
[1] SPECIFICATIONS
As a part of policy of continuous improvement, SHARP reserves the right to make design and specifcation changes for
product improvement without prior notice. The performance specifcation gures indicated are nominal values of production
units. There may be some deviations from these values in individual units.
NOTE
Refer to inside back cover for dimensional drawings.
Item
37" LCD COLOUR TV,
Model: LC-37GE1E
Video Colour System
PAL/SECAM/NTSC 3.58/NTSC 4.43/PAL 60
TV
Function
CCIR (B/G, I, D/K, L, L', M, N)
TV-
Standard
LCD panel
37" Advanced Super View & BLACK TFT LCD
Number of dots
6,220,800 dots (1920 g 1080 g 3 dots)
VHF/UHF
E2- E69ch, F2-F10ch, I21-I69ch, IR A-IR Jch, (Digital: E5-E69ch)
CATV
Hyper-band, S1-S41ch
TV-Tuning System
Auto Preset 999 ch, Auto Label, Auto Sort
STEREO/BILINGUAL
NICAM/A2
Receiving
Channel
Brightness
450 cd/m
2
Backlight life
60,000 hours (at Backlight Standard position)
Viewing angles
H : 176° V : 176°
Audio amplifer
15W x 2
Speaker
Ø 65 mm g 4, Ø 25 mm g 2
9 pin MINI-DIN male connector
EXT 2
EXT 3
EXT 3
S-VIDEO (Y/C input), RCA pin (AV input)
RS-232C
UHF/VHF 75ǡDin type (Analogue & Digital)
SCART (AV input/monitor output, Y/C input, AV Link)
Antenna input
EXT 5
HDMI, Ø 3.5 mm jack (Audio input)
EXT 1
SCART (AV input, Y/C input, RGB input, TV output)
EXT 4
Ø 3.5 mm jack (Audio input), 15 pin mini D-sub (PC/Component)
Digital
DVB-T (2K/8K OFDM)
Analogue
OSD language
English/German/French/Italian/Spanish/Dutch/Swedish/Portuguese/Finnish/
Turkish/Greek/Russian/Polish
Power Requirement
AC 220-240 V, 50 Hz
Power Consumption
220 W (2.5 W Standby) (Method IEC60107)
Weight
23.5 kg (Without stand), 28.5 kg (With stand)
OUTPUT
RCA pin (Audio)
Headphones
Ø 3.5mm jack (Audio output)
C. I. (Common Interface) EN50221, R206001
Operating temperature
0°C to + 40°C
EXT 6
HDMI
Terminals Rear
