LG 710E Service Manual

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SAFETY PRECAUTIONS
- 3 -
SAFETY-RELATED COMPONENT WARNING!
There are special components used in this color monitor
which are important for safety. 
These parts are marked
on the schematic diagram and the replacement
parts list.
It is essential that these critical parts should be
replaced with the manufacturer's specified parts to prevent
X-radiation, shock, fire, or other hazards. Do not modify
the original design without obtaining written permission
from manufacturer or you will void the original...

- 4 -
SERVICING PRECAUTIONS
CAUTION:Before servicing receivers covered by this
service manual and its supplements and addenda, read
and follow the 
SAFETY PRECAUTIONSon page 3 of this
publication.
NOTE:If unforeseen circumstances create conflict
between the following servicing precautions and any of the
safety precautions on page 3 of this publication, always
follow the safety precautions. Remember: Safety First.
General Servicing Precautions
1.  Always unplug the receiver AC power cord from the AC
power...

- 5 -
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and
appropriate tip size and shape that will maintain tip
temperature within the range or 500
F to 600F.
2. Use an appropriate gauge of RMA resin-core solder
composed of 60 parts tin/40 parts lead.
3.  Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a
mall wire-bristle (0.5 inch, or 1.25cm) brush with a
metal handle.
Do not use freon-propelled spray-on cleaners.
5....

- 6 -
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed
circuit board will weaken the adhesive that bonds the foil
to the circuit board causing the foil to separate from or
"lift-off" the board. The following guidelines and
procedures should be followed whenever this condition is
encountered.
At IC Connections
To repair a defective copper pattern at IC connections use
the following procedure to install a jumper wire on the
copper pattern side of the circuit board....

TIMING CHART
-7-
VIDEO
SYNC
C
E
DF
AB
* No Support Composite Mode.
H – 37.50 26.67 20.32 6.35 2.03 3.81 0.51
V – 74.99 13.335 12.802 0.533 0.080 0.427 0.026
H + 46.88 21.33 16.16 5.17 1.62 3.23 0.32
V + 75.01 13.331 12.798 0.533 0.064 0.448 0.021
H + 53.68 18.63 14.22 4.41 1.14 2.70 0.57
V + 85.07 11.755 11.178 0.577 0.056 0.503 0.018
H + 68.677 14.561 10.836 3.725 1.016 2.201 0.508
V + 85.00 11.764 11.182 0.582 0.044 0.524 0.014
ModeH/V
Sort
1
2
3
4640x480
75Hz
800x600
85Hz
1024x768
85Hz 800x600
75Hz...

DISASSEMBLY
- 8 - 1.  Carefully place the monitor on a soft cushion
and stand it upright with the cabinet facing
downward.
2. Remove the two screws from the back cover.4. Separate the back cover from the latch at the
bottom of the cabinet using the jig as shown in
the figure. 
(Insert the jig into the latch and lift slightly.)
3. Separate the back cover from the latch on top
of the cabinet using a screwdriver as shown in
the figure. 
(Insert the screwdriver and gently press the
latch.)5. Lift up the back...

1. Preparation for Service Adjustment
GENERAL INFORMATION
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several adjustments may be required. 
Adjustment should be following procedure and after
warming up for a minimum of 30 minutes. 
• Alignment appliances and tools.
- IBM compatible PC.
- Programmable Signal Generator. 
(eg. VG-819 made by Astrodesign  Co.)
- EPROM or EEPROM with saved each mode data.
- Alignment Adaptor and Software.
- Digital...

- 10 -
4. Distortion
Scanning frequency : All Mode (Mode 1~4)
Display image : Crosshatch pattern
Horizontal : 10 Row
Vertical : 8 Row
A-B2.0mm,C-D2.0mm
E-F2.0mm,G-H2.0mm
5. Displa Size drift
4mm : 25Standard, 1035
0.5mm : 180V ~ 264V
6. Linearity
Formula : 
(Max - Min) / Maxx 100(%)
Criteria  : H - 10% Max. (Upper 40kHz)
14% Max. (Less 40kHz)
V - 8% Max.
7. Regulation
Luminance
2mm
Dynamic(lode)
2mm
Scanning frequency : All Mode (Mode 1~4)
8. Trapezoid
9. Pin Balance10. Parallelogram
11. Adjustment of...