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CONFIDENTIAL
TFT-LCD MONITOR
GH19P*
SERVICE Manual
TFT-LCD MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Troubleshooting
5. Exploded View & Parts List
6. Electrical Parts List
7. Block Diagram
8. Wiring Diagram
9. Schematic Diagrams
10. Panel Description
CONFIDENTIAL
1 Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1 Safety Precautions
1-1-1 Warnings
1. For continued safety, do not attempt to modify the (READING SHOULD
circuit board. NOT BE ABOVE 0.5mA)
2. Disconnect the AC power and DC Power Jack
before servicing. DEVICE
LEAKAGE
CURRENT
UNDER TESTER
3. When the chassis is operating, semiconductor TEST
TEST ALL
heatsinks are potential shock hazards. EXPOSED METAL
SURFACES
1-1-2 Servicing the LCD Monitor 2-WIRE CORD
1. When servicing the LCD Monitor, remove the static
charge by connecting a 10k ohm resistor in series ALSO TEST WITH
PLUG REVERSED
with an insulated wire (such as a test probe) (USING AC ADAPTER
PLUG AS REQUIRED)
between the chassis and the anode lead. EARTH
GROUND
(Disconnect the AC line cord from the AC outlet.)
2. It is essential that service technicians have an Figure 1-1. Leakage Current Test Circuit
accurate voltage meter available at all times. Check
the calibration of this meter periodically. 4. With the unit completely reassembled, plug the AC
line cord directly into a 120V AC outlet. With the
1-1-3 Fire and Shock Hazard unit's AC switch first in the ON position and then
Before returning the monitor to the user, perform the OFF, measure the current between a known earth
following safety checks: ground (metal water pipe, conduit, etc.) and all
exposed metal parts, including: metal cabinets,
1. Inspect each lead dress to make certain that the
screwheads and control shafts. The current
leads are not pinched or that hardware is not
measured should not exceed 0.5 milliamp. Reverse
lodged between the chassis and other metal parts in
the power-plug prongs in the AC outlet and repeat
the monitor.
the test.
2. Inspect all protective devices such as nonmetallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields, 1-1-4 Product Safety Notices
isolation resistor-capacitor networks, mechanical
Some electrical and mechanical parts have special
insulators, etc.
safety-related characteristics which are often not
3. Leakage Current Hot Check (Figure 1-1): evident from visual inspection. The protection they give
WARNING: Do not use an isolation transformer may not be obtained by replacing them with
during this test. components rated for higher voltage, wattage, etc. Parts
Use a leakage current tester or a metering system that have special safety characteristics are identified by
that complies with American National Standards ! on schematics and parts lists. A substitute
Institute (ANSI C101.1, Leakage Current for replacement that does not have the same safety
characteristics as the recommended replacement part
Appliances), and Underwriters Laboratories (UL
might create shock, fire and / or other hazards. Product
Publication UL1410, 59.7).
safety is under review continuously and new
instructions are issued whenever appropriate.
GH19P* 1-1
CONFIDENTIAL
2 Product Specifications
2-1 Specifications
Item Description
LCD Panel TFT-LCD panel, RGB vertical stripe, normally black transmissive,
0.264 pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 81 kHz (Automatic)
Vertical : 56 Hz ~ 85 Hz
Display Colors 16,7 Million colors
Maximum Resolution Horizontal : 1280 Pixels @ 81 kHz
Vertical : 1024 Pixels @ 76 Hz
Input Video Signal Analog : 0.7 Vp-p