LG MW-30LZ10 Owner's Manual
CONTENTS
Contents .................................................................................................. |
2 |
Safety Precautions .................................................................................. |
3 |
Adjustment Instruction ............................................................................ |
4 |
Troubleshooting ....................................................................................... |
6 |
Printed Circuit Board ............................................................................... |
7 |
Block Diagram......................................................................................... |
11 |
Exploded View ...................................................................................... |
16 |
Exploded View Parts List ....................................................................... |
17 |
Replacement Parts List ........................................................................ |
18 |
SVC. Sheet ................................................................................................. |
|
-2-
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An lsolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.
It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitary that may be inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on positioin, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1MΩ and 5.2MΩ. When the exposed metal has no return path to the chassis the reading must be infinite.
An other abnormality exists that must be corrected before the receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each esposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5mA.
In case any measurement is out of the limits sepcified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.
Leakage Current Hot Check circuit
AC Volt-meter
Good Earth Ground
such as WATER PIPE,
To Instrument's
CONDUIT etc.
0.15uF
exposed
METALLIC PARTS
1.5 Kohm/10W
-3-
ADJUSTMENT INSTRUCTION
1. Application Object
These instructions are applied to all of the MODELS of LCD
MONITOR, MF-02HA.
3-2. EDID (The Extended Display
Identification Data) Adjustment
(1) This is the function that is made for the realization of "Plug and Play" which makes possible to use the user
2.Notes
(1)Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation
transformer will
(2) Adjustment must be done in the correct order. But, it can be changed in consideration of mass production.
(3) The adjustment must be performed in the circumstance of 25±5°C of temperature and 65±10% of relative humidity if there is no specific designation.
(4) The input voltage of the receiver must keep 220V, 60Hz in adjusting.
[ Input voltage is possible from 85V to 260V because the power voltage applied to this chassis is Wide-Range. But, adjustment should be operated in 220V/60Hz if there is no specific designation.
(5) The receiver must be operated for about 15 minutes prior to the adjustment.
¤After receiving 100% white pattern(06CH), the receiver must be operate prior to adjustment.(Or white condition in HEAT-RUN mode)
¤Ł Enter into HEAT-RUN mode
Select HEAT RUN OFF by pressing ADJ button on Remote Control for adjustment.
Press the VOL + button in HEAT-RUN OFF. (OSD displays HEAT-RUN WHITE and screen displays 100% full WHITE PATTERN)
[Set is activated HEAT-RUN without signal generator in this mode.
[Single color pattern of HEAT-RUN mode can be used to check PANEL.(RED/BLUE/GREEN)
[Caution] If you turn on a still screen more than 20 minutes
(especially, Digitalpattern[13 CH], Cross Hatch Pattern[09CH]), a afterinage may be occur in the black level part of the screen.
environment right after reorganization by communicating with monitor automatically.
(2) EDID DATA for DVI of MF-02HA
EDID table =
00010203040506070809
000|00FFFFFFFFFFFF001E6D
010|D73A01010101330B0101
020|8140269608B7FBA15648
030|982413484BAFEF008100
040|3159455961598180714F
050|01010101BC3400985100
060|2A401090130040260000
070|001E000000FC004D5720
080|33304C5A31300A202020
090|000000FD003C781F5B10
100|000A202020202020D509
110|80A020E02D101060A200
120|EEF07500001800BD
(3) EDID DATA for RGB of MF-02HA
EDID table =
00010203040506070809
000|00FFFFFFFFFFFF001E6D
010|D73A01010101330B0101
020|1E40269608B7FBA15648
030|982413484BAFEF008100
040|3159455961598180714F
050|01010101BC3400985100
060|2A401090130040260000
070|001E000000FC004D5720
080|33304C5A31300A202020
090|000000FD003C781F5B10
100|000A202020202020D509
110|80A020E02D101060A200
120|EEF07500001800BD
(4) Refer to Service Manual related to EDID communication.
3. Adjustment Items
3-1. Whole Assembly Adjustment
(1)White Balance Adjustment
(2)SUB-BRIGHT Adjustment : Sub-Bright adjustment in LCD panel is not necessary. Do not adjust sub-bright if there is
no specific designation.
(3) RGB CUT-OFF Adjustment : Under examination about auto adjustment which correspond to the new Rembrandt1A.
4. Whole Assembly Adjustment
<Caution> Each PCB Assy must be checked by Check JIG Set before assemling.(Be careful about power PCB ASSY which can give a fatal damage to the LCD Module)
4-1. White Balance Adjustment
(1) Required Equipment
Color analyzer(CA-100 or same production)
-4-
TROUBLESHOOTING
|
Symptom |
|
Cause |
1. |
No power from all outputs |
1) |
Fuse open |
|
|
2) |
Error of rectying circuit/EMI Filter |
2. |
No power from +24V/+12V |
1) |
Short of output terminal |
|
/+18V |
2) Input error of parts |
|
|
|
3) |
Error of U902 and peripheral circuits. |
|
4) |
Error of T803 |
3. No power from +18V |
1) |
Short of output terminal |
|
2) |
Input error of parts |
|
3) |
Error of U802 and peripheral circuits. |
4. No power from +5VS |
1) |
Short of output terminal |
|
2) |
Input error of parts |
|
3) |
Error of U903 and peripheral circuits. |
Check Point
1)Check BD801, Q801, Q802, Q804
2)Check BD801, L801, L802, TH800, TH801
1)Check the second side parts and Pattern short
2)Check reverse input of PH801, D916, CR802
3)Check R941~R944when the Pin Bias power no7. of
U902 is abnormal. (normal: 15V~25V)
Replace U902(FAN7554) parts
Check the error of Q804
4) Replace T803
1)Check the peripheral parts of 18V and Pattern short.
2)Check reverse input of D916(SB560)
3)No Input of L812 when both terminal voltage of C830
are low. (normal voltage: +24V)
Replace U802(PQ1CG203) parts when there is no
error.
1)Check the peripheral parts of 5VS and Pattern short.
2)Check reverse input of D802, CR801
3)Check R937~R939when the Pin Bias power no7. of U903 is abnormal. (normal: 15V~25V)
|
|
|
Replace U903(FAN7554) parts |
|
|
|
Check the error of Q802 |
4) |
Error of T802 |
4) |
Replace T802 |
5. No power from +24V/+12V 1) |
Drop of output power due to the error |
1) |
Replace U901(MC33368D) when there is no error in |
/+18V in 110VAC Input |
of PFC circuit. |
|
the peripheral parts. |
|
|
|
Check the error of Q801 |
2) |
Error of T801 |
2) |
Replace T801 |
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