LG FLATRON L1750S, Service Manual

Page: 5 / 30

- 2 -
CONTENTS
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 3
TIMING CHART ....................................................... 7
DISASSEMBLY ....................................................... 8
BLOCK DIAGRAM ................................................... 9
DESCRIPTION OF BLOCK DIAGRAM...................10
ADJUSTMENT ...................................................... 12 SERVICE OSD ...................................................... 13
TROUBLESHOOTING GUIDE .............................. 14
WIRING DIAGRAM ............................................... 18
EXPLODED VIEW...................................................19
REPLACEMENT PARTS LIST ...............................21
SCHEMATIC DIAGRAM ......................................... 23
1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Active Display Area : 17 inch diagonal-L1750S
: 19 inch diagonal-L1950S
Pixel Pitch : 0.264 (H) x 0.264 (V)-L1750S
: 0.294 (H) x 0.294 (V)-L1950S
Size : 358.5 (W) x 296.5 (H) x 17.0 (D)-L1750S
: 404.2 (W) x 330 (H) x 22.0 (D)-L1950S
Color Depth : 16.2M colors
Electrical Interface : LVDS
Surface Treatment : Hard-coating(3H), Anti-Glare
Operating Mode : Normally White, Transmissive mode
Backlight Unit : 4-CCFL(Cold Cathode Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥
10
L1750S
Left : -60° min., -70°(Typ)
Right : +60° min., +70°(Typ)
Top :+45° min., +60°(Typ) Bottom : -50°min., -60°(Typ)
L1950S
Left : -70° min., -80°(Typ)
Right : +70° min., +80°(Typ)
Top :+75° min., +85°(Typ) Bottom : -75°min., -85°(Typ)
2-2. Luminance : 185(min), 250(Typ)
2-3. Contrast Ratio : 300(min), 450(Typ)-L1750S
: 300(min), 500(Typ)-L1950S
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate Sync, SOG (Sync On Green)
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.71 V
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.467 Vp-p
c) Color 15, 0 : 0.714 Vp-p
3) Input Impedance : 75
Ω
3-3. Operating Frequency
Horizontal : 30 ~ 83kHz
Vertical : 56 ~ 75Hz
4. Max. Resolution
Analog : 1280 x 1024 / 75Hz
5. POWER SUPPLY
5-1. Power : AC 100~240V, 50/60Hz , 1.0A
5-2. Power Consumption
6. ENVIRONMENT
6-1. Operating Temperature: 10°C~35°C (50°F~95°F)
(Ambient)
6-2. Relative Humidity : 10%~80%
(Non-condensing)
6-3. MTBF : 50,000 HRS wiht 90% Confidence level
Lamp Life : 50,000 Hours (min)
7. DIMENSIONS (with TILT/SWIVEL)
L1750S
Width
: 368 mm (14.49'')
Depth : 230.5 mm (9.07'')
Height : 389.2 mm (15.32'')
L1950S
Width
: 413 mm (16.26'')
Depth : 230.5 mm (9.07'')
Height : 421.4 mm (16.59'')
8. WEIGHT (with TILT/SWIVEL)
L1750S
Net. Weight
: 4.9 kg (10.80 lbs)
Gross Weight : 6.5 kg (14.33 lbs)
L1950S
Net. Weight
: 5.7 kg (12.57 lbs)
Gross Weight : 7.9 kg (17.42 lbs)
SPECIFICATIONS
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
POWER CONSUMPTION
less than 43 W-L1750S
less than 45 W-L1950S
less than 1 W
less than 1 W
less than 1 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
VIDEO
ACTIVE
OFF
OFF
OFF
http://www.wjel.net