In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
LC-20VM2E
LC-20VM2E
1. IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................... 2
3. PART NAMES.......................................................................................................................................... 4
13. PARTS LIST............................................................................................................................................. 63
14. PACKING OF THE SET ........................................................................................................................... 78
The component parts of this model are partially differentdepending on their suffix symbols. Before servicing theunits, be sure to check the suffix symbol on the modellabel that is applied on the bottom side of the unit.
CONTENTS
Page
Suffix symbol ( , K , X )
SHARP CORPORATION
1
If you need more information on Computer and Electronic Repair, please visit these
If you’re a LCD Monitor repairer, then this is the best guide for you.
Why? Because, the author revealed all his LCD Monitor Repairing
secrets for you. I think, with just few Repair tips you learned from
this guide you will get back your investment!
Click Here to read more.
This eBook will show you how to test the electronic component
correctly and accurately. Some of you may say that I don’t
need this eBook because it is too simple! Do you know that,
there is lots of testing electronic components secrets I have learned
from this guide? Do you know how to test a‘TRIAC’ correctly and
accurately? If you answer no then I guess you have to get this
EBook. Click Here to read more.
Are you tired of searching the service manuals to look for the value
of a burnt resistor? If the answer is YES, then this eBook is a ‘must
have’ guide for you. You can save a lot of time and be able to repair
customer’s Electronic equipment with burnt resistors in it.
Click here to read more.
LC-20VM2E
DVM
AC SCALE
1.5k ohms.
10W
0.15 µF
TEST PROBE
1. IMPORTANT SERVICE SAFETY PRECAUTION
æ Service work should be perfomed only by qualified service technicians who are
thoroughly familiar with all safety checks and servicing guidelines which follow:
LC-121M2ELC-150M2E
WARNING
1. For continued safety, no modification of any
circuit should be attempted.
2. Disconnect AC power before servicing.
CAUTION
FOR CONTINUED PROTECTION
AGAINST A RISK OF FIRE REPLACE
ONLY WITH SAME TYPE FUSE. F702 (2A,
250V), F703 (2.5A, 250V), F7751 (5A, 250V)
FUSE.
A V
BEFORE RETURNING THE MONITOR
(Fire & Shock Hazard)
Before returning the monitor 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 monitor.
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
current in the following manner.
• Plug the AC Adaptor directly into a 100~240 volt
AC outlet, and connect the DC power cable into
the monitor's DC jack. (Do not use an isolation
transformer for this test).
• Using two clip leads, connect a 1.5k ohm, 10
watt resistor paralleled by a 0.15µF 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.
• Use an AC voltmeter having with 5000 ohm per
volt, or higher, sensitivity or measure the AC
voltage drop across the resisor.
• Connect the resistor connection to all exposed
metal parts having a return path 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 Adaptor plug connection reversed.(If necessary, a
nonpolarized adaptor plug must be used only for
the purpose of completing these checks.)
Any reading of 0.3V RMS(this corresponds
to 0.2 milliamp. AC.) or more is excessive and
indicates a potential shock hazard which must
be corrected before returning the monitor to
the owner.
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
SAFETY NOTICE
Many electrical and mechanical parts in LCD monitor
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, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by
“ å” and shaded areas in the
and
Schematic Diagrams
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.
Replacement Parts Lists
.
2
LC-121M2ELC-150M2E
2. SPECIFICATIONS
Number of Picture Elements: 885,120 (640 (H) × 3 (RBG) × 461 (V))
Connected Terminals: DC Input Terminal (DC13V), S-Video Input Terminal, Video Input Terminal 2
Power Consumption (Approx.): 20" type 50.7 W (DC 13V Input)
Operating Temparature: 0°C~40°C
Specifications are subject to changed without prior notice.
LC-20VM2E
Type: LCD display unit (LCD color AV monitor)
Size: 20" type (298.8 mm × 401.3 mm)
Display System: Transmitting type TN liquid crystal panel.
Driving System: TFT (Thin Film Transistor) active matrix system
Speaker Output: 4.0 W (Front 0.7W + 0.7W, Rear 2.6W)
System, Audio Input Treminal 2 System (As for 1 system of the video input
terminal, the audio input terminal, switching is possible for the one for the monitor
output.)
Component Video Terminal, Component Video Audio Terminal, RGB Input
Terminal, Serial Control Terminal, Headphone Output Terminal
Power Source: AC 110~240·50/60Hz (Connected to AC Adapter)
Dimensions: 460 mm (W) × 435 mm (H) × 180 mm (D) (Includes Set Stand)
460 mm (W) × 406 mm (H) × 49.5 mm (D) (Not Include Set Stand)
Weight (Approx.): 8.7 kg (Includes Set Stand)
6.3 kg (Not Include Set Stand)
Accessories: Operation Manual, AC Adapter, AC Cable, Remote Control,
Batteries (AAA size x 2), AV Cable, RS232C Cable, Cable Clamp (× 2),
Back Cover (× 1)
3
LC-20VM2E
3. PART NAMES
LC-121M2ELC-150M2E
4
LC-121M2ELC-150M2E
4. OUTLINE DIMENSION FIGURE
LC-20VM2E
5
LC-20VM2E
5. REMOVING THE MAIN PARTS
1. Remove the four main PWB fixing screws.
2. Remove the three inverter PWB fixing screws.
3. Remove the four RGB terminal PWB fixing screws.
4. Remove the one terminal PWB fixing screw and 1 earth
fixing screw to remove the reinforcing plate.
5. Remove the two LCD unit fixing screws.
6. Remove the three operation PWB fixing screws.
LC-121M2ELC-150M2E
LCD Display Unit
3
RGB Terminal PWB
1
(Main PWB)
2
Inverter PWB
Terminal PWB Ass'y
Reinforcing Plate
4
5
5
6
Operate PWB
÷
Cabinet A
6
LC-121M2ELC-150M2E
•Caution for handling the LCD panel
1. Work in a clean room. (Humidity: 50% or more)
2. A worker must wear arm bands.
3. Work on a conductive mat.
4. Do not expose the unit to shock such as fall or vibration.
5. Use an ionizer. (within 30 cm)
LC-20VM2E
7. Remove the four LCD unit front fixing screws and 4 rear
fixing screws to remove the shield plate.
8. Remove the two reflection sheets.
9. Remove the upper and lower fluorescent tubes.
10.Remove the light guide plate.
11.Remove the upper and lower reflection sheets.
12.Remove the upper and lower spacers.
13.Remove the ITO sheet.
14.Remove the diffusion sheet and the reflection polarizing
plate.
7
LCD Display Unit
(Front)
Spacer (Upper)
ITO Sheet
LCD Display Unit
Lamp Reflector (Upper)
(PSHEP0184CEZZ)
Light Guide Sheet
12
13
14
Reflection Polarising Sheet
Lamp Unit (Upper)
(KLMP-0091CEZZ)
9
11
10
Diffusion Sheet
12
Spacer (Lower)
7
9
Lamp Unit (Lower)
(KLMP-0092CEZZ)
Lamp Reflector (Lower)
11
(PSHEP0185CEZZ)
7
7
Shield Plate
8
Reflection Sheet A
(PSHEP0186CEZZ)
Reflection Sheet B
(PSHEP0187CEZZ)
7
LC-20VM2E
6. LC-20VM2 ADJUSTING METHOD
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust
as follows.
6-1. Preparation for adjustment
(1)Use the exclusive-use AC adapter or stable DC power supply.
AC adapter: UADP-0205CEZZ
DC power supply: 13 (V) 5(A) (Total of the triple power supply)
6-2. Special mode setting procedure
Note: When a micro-controller (IC2001) is replaced, the initialization of the E2 memory is necessary.
(1)After initialization of E2PROM the mode is changed to the adjustment mode.
[Procedure]
Connect TP2002 and TP2003 to GND, and turn on the power.
[Description]
All data are initialized.
LC-121M2ELC-150M2E
(2)Change to adjustment mode
[Procedure]
Press the “ADJUSTMENT” key on the remote control.
[Description]
The manual adjustment or adjustment through communication with the automatic machine is performed.
(3)Inspection mode
[Procedure]
After turning on the power, press the “INSPECTION” key on the remote control.
(4) Switching to the factory default setting mode
[Procedure]
After turning on the power, press the “DEFAULT SETTING” key on the remote control.
“SETTING COMPLETE” appears on the screen.
[Description]
Set the user adjustment value to default.
6-3. How to exit from the special mode
Turn off the main unit power.
8
LC-121M2ELC-150M2E
6-4. OSD menu indication and items in case of manual adjustment
Adjusting range
PageItemMinimum MaximumInitialRemarks
1+ B – ADJ0255160
MODELVM2UVM1/VM2E/VM2U
NTSC/PALM OSC0255128
PAL/SECAM OSC0255128
ERROR NO00Number of the error detection
ERROR RESETWAITWAIT/RESET
COM025590
BELL FO0255120
B-Y BLACK LEVEL0158
R-Y BLACK LEVEL0158
COPY GUARDONOFF/ON
2SYSTEMAUTON358/N443/PAL/PAL-
LOUNDNESOFFON/OFF
TA1276 DATA0000
TEST PATTERNOFFON/OFF
I2C DATA000000
I2C DATAWAITWAIT/SEND
G/A W DATA0000
G/A W DATAWAITWAIT/SEND
G/A R DATA00
G/A R DATAWAITWAIT/SEND
G/A R DATA00
ROM COLLECTIONWAITTo the data input screen
LC-20VM2E
3N358 BRIGHTNESS0255130
R CUTOFF025580
B CUTOFF025580
N358 UNICOLOR012760
R DRIVE012764
B DRIVE012764
N358 SCOLOR03125
N358 TINT012767
N443 BRIGHTNESS0255130
N443 UNICOLOR012750
N443 SCOLOR03125
N443 TINT012762
9
LC-20VM2E
4PAL-M BRIGHTNESS0255130
5DVD 60 BRIGHTNESS0255130
LC-121M2ELC-150M2E
PAL-M UNICOLOR012750
PAL-M SCOLOR03124
PAL-M TINT012762
PAL BRIGHTNESS0255130
PAL UNICOLOR012750
PAL SCOLOR03119
PAL TINT012762
SECAM BRIGHTNESS0255130
SECAM UNICOLOR012780
SECAM SCOLOR012775
SECAM TINT012758
DVD 60 UNICOLOR012765
DVD 60 COLOR012761
DVD 60 TINT012767
DVD 50 BRIGHTNESS0255130
DVD 50 UNICOLOR012765
DVD 50 COLOR012761
DVD 50 TINT012762
DVD 60 R-Y PHASE032
DVD 60 B-Y PHASE033
DVD 50 R-Y PHASE032
DVD 50 R-Y PHASE031
6RGB BRIGHTNESS025570
RGB R CUTOFF025580
RGB B CUTOFF025580
RGB CONTRAST012790
RGB R DRIVE012764
RGB B DRIVE012764
MASKOFFON/OFF
HMASK-L0FF2Hexadecimal indication
HMASK-R0FFFDHexadecimal indication
RGB CLOCK03FF320Hexadecimal indication
DATA COPY
AD CHECKOFFON/OFF
7AV NT/PALM H07F19Hexadecimal indication
DVD 60 H07F1DHexadecimal indication
AV PAL H07F12Hexadecimal indication
DVD 50 H07F14Hexadecimal indication
AV SECAM H07F10Hexadecimal indication
RGB H07F9CHexadecimal indication
RGB TEXT H07F9CHexadecimal indication
NT/PALM V11F0BHexadecimal indication
PAL V11F0AHexadecimal indication
SECAM V11F09Hexadecimal indication
RGB V13F1DHexadecimal indication
RGB TEXT V13F25Hexadecimal indication
PARITYNONENONE/EVEN/ODD
TIME OUT0FF0Hexadecimal indication
AV V00255240
AV V0 BIAS0255127
AV V160255185
AV V16 BIAS0255127
AV V320255123
AV V32 BIAS0255118
AV V48025575
AV V48 BIAS0255127
AV V63025540
AV V63 BIAS0255127
6-5. Adjustment process mode special key operation
With the “AUTO PRESET” key on the remote controlForward movement of the page
With the “MANUAL MEMORY” key on the remote controlMoves to the first line of the current page
With the “MENU” key on the remote control or the main unitForward movement of the selection item
With the “PICTURE SELECTION” key on the remote controlBackward movement of the selection item
11
LC-20VM2E
6-6. Service Adjusting
6-6-1. Main chassis adjustment
AdjustmentAdjusting conditionsAdjusting method
1+B Adjustment1. Connect the DC voltmeter to1. Adjust the DC/DC 5V line output
(+B ADJ Item)TP1101voltage so as to get 5.0±0.05V.
1Confrontation bias1. A confrontation adjustment pattern is1. It is adjusted so that the flicker of the
adjustmentdisplayed.image plane may stop in the
(The 12th-page COM Item)confrontation adjustment pattern.
2Black level adjustment1. A JA-5CH signal is displayed.1. It confirms that the third gradation is
(The 12th-page N358a cut-off point from the left of the
BRIGHTNESS Item)gradation pattern.
3White balance adjustment 1. A JA-6CH signal is displayed.1. White balance in comparison with the
(The 12, 13th-pageTyp monitor.
N358 R CUTOFF
N358 B CUTOFF
N358 R DRIVE
N358 B DRIVE Item)
18
LC-121M2ELC-150M2E
(2)PAL finished adjustment
AdjustmentAdjusting conditionsAdjusting method
1Black level adjustment1. Set is set in the compulsion PAL1. It confirms that the third gradation is
(The 14th-page PALmode.a cut-off point from the left of the
BRIGHTNESS Item)2. A JA-5CH signal is displayed.gradation pattern.
(3)DATA Copy
A sound volume key is manipulated in accordance with the data copy item.
Data is copied on each item of N443, PAL-M the adjustment value of the PAL item.
(4)RGB finished adjustment
AdjustmentAdjusting conditionsAdjusting method
1Black level contrast1. The test pattern of the figure 1 is1. 5 step RGB BRIGHTNESS value is
confirmationdisplayed.given to it by the figure 1 A point more
(The 4th-pagethan a cut-off.
RGB BRIGHTNESS2. 5 step RGB CONTRAST value is
RGB CONTRAST Item)lowered by the figure 1 B point more
LC-20VM2E
than white level saturation.
Figure 1
Point BPoint A
6-7. Monitor default settings
(1)Press the default setting key on the remote control after turning on the power switch.
"SETTING COMPLETE" appears on the screen.
The setting details are as follows:
CONTRASTCENTER
BRIGHTNESSCENTER
COLORCENTER
TINTCENTER
BACK LIGHTAUTO
COLOR SYSTEMAUTO
19
LC-20VM2E
7. INTEGRATED CIRCUIT TERMINAL ARRANGEMENTS
7-1. IC2001 (QFP, 80pins) MICRO CONTROLER
Terminal No.Terminal nameI/OFunctionType
1N. C–—
2N. C–—
3SCLI/OI2C bus serial clock lineOD
4SDAI/OI2C bus serial data lineOD
5H PDETIHeadphon input pickupOD
6DCLKOClock for communicationOD
7DOUTOData output for communicationOD
8DINIData input for communicationOD
9FS MUTOFront speaker MUTE outputOD
10RS MUTORear speaker MUTE outputOD
11N. C–—
12N. C–—
13CSYNCIComposite sync signal inputOD
14KEY1IKey input 1OD
15REQO“H” in SECAM mode, “L” in other modes.PP
16GAENIG/A read enablePP
17MRDYII2C bus opening/connection selection inputOD
18SINI232C data inputOD
19SCLKI/O232C clock signalPU
20SOUTO232C data outputOD
21N. C–—
225 VINIDC/DC5V voltage inputOD
23SCANOPAL scanning line switchingOD
24LMUTEOLineout-Mute outputOD
25N. C–—
26N. C–—
27CNV s sGND connection—
28φOTiming outputPP
29RESETIChange to “Reset mode” in “L” state—
30XinIMicrocomputer oscillator connection—
31XoutOMicrocomputer oscillator connection—
32V s sIGND terminal—
33STBOMicrocomputer power OFF outputPP
34POWOUTODC/DC control outputPP
35COCSOG/A chip selection outputPP
36DACSOD/A chip selection outputPP
37DA2CSOD/A2 chip selection outputPP
38232CCSO232C chip selection outputPP
39N. C–—
40N. C–—
41L/ROWhen the right and left are reversed: H, Normal: LPP
42YCODynamic YC separationPP
43AV/RGBOAnalog SW selection 2PP
44Y/COMOAnalog SW selection 3PP
45IN/OUTOVideo 2 input/monitor output switchingPP
46N358O“H” in N358 mode, “L” in other modes.PP
47N443O“H” in N443 mode, “L” in other modes.PP
48PALO“H” in PAL mode, “L” in other modes.PU
49SECAMO“H” in SECAM mode, “L” in other modes.PU
LC-121M2ELC-150M2E
20
Loading...
+ 49 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.