LG Electronics L1733TR, L1933TR service manual Precaution, Warning For The Safety-Relatedcomponent

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PRECAUTION

PRECAUTION

WARNING FOR THE SAFETY-RELATED COMPONENT.

• There are some special components used in LCD monitor that 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 electric shock, fire or other hazard.

Do not modify original design without obtaining written permission from manufacturer or you will void the original parts and labor guarantee.

TAKE CARE DURING HANDLING THE LCD MODULE WITH BACKLIGHT UNIT.

Must mount the module using mounting holes arranged

 

in four corners.

Do not press on the panel, edge of the frame strongly

 

or electric shock as this will result in damage to the

WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING

BE CAREFUL ELECTRIC SHOCK !

If you want to replace with the new backlight (CCFL) or inverter circuit, must disconnect the AC adapter because high voltage appears at inverter circuit about 650Vrms.

Handle with care wires or connectors of the inverter circuit. If the wires are pressed cause short and may burn or take fire.

Leakage Current Hot Check Circuit

AC Volt-meter

screen.

• Do not scratch or press on the panel with any sharp

To Instrument’s exposed

Good Earth Ground such as WATER PIPE, CONDUIT etc.

 

objects, such as pencil or pen as this may result in

 

damage to the panel.

• Protect the module from the ESD as it may damage the

 

electronic circuit (C-MOS).

Make certain that treatment person’s body are

 

grounded through wrist band.

Do not leave the module in high temperature and in

 

areas of high humidity for a long time.

• The module not be exposed to the direct sunlight.

• Avoid contact with water as it may a short circuit within

 

the module.

• If the surface of panel become dirty, please wipe it off

 

with a softmaterial. (Cleaning with a dirty or rough cloth

 

may damage the panel.)

marked on the schematic diagram and the CAUTION

Please use only a plastic screwdriver to protect yourself from shock hazard during service operation.

METALLIC PARTS

1.5 Kohm/10W

Copyright 2007 LG Electronics. Inc. All right reserved.

LGE Internal Use Only

Only for training and service purposes

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Contents BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUALSame model for Service CHASSIS NO. LM57BSPECIFICATIONS CONTENTSLeakage Current Hot Check Circuit PRECAUTIONWARNING FOR THE SAFETY-RELATEDCOMPONENT marked on the schematic diagram and theSERVICING PRECAUTIONS General Servicing PrecautionsElectrostatically Sensitive ES Devices Removal/Replacement IC Remove/ReplacementReplacement Small-SignalDiscrete TransistorCircuit Board Foil Repair At IC ConnectionsAt Other Connections TIMING CHART VIDEOSYNC Pull up the stand part DISASSEMBLY-SetOnly for training and service purposes Soft pad on the table3.Put the front face down Only for training and service purposesRemove the screws 1.Pull the front cover upwardIn case of Latch #1-1 DISASSEMBLY-StandHold the stand body In case of Latch #1DISASSEMBLY-Stand Only for training and service purposesLine Buffer BLOCK DIAGRAMLIPS MStarACEBLOCK DIAGRAM-POWER POWERINVERTER 3.MICOM Part DESCRIPTION OF BLOCK DIAGRAM2.Power Part 1.Video Controller PartOperation description LIPS LIPS Board Block Diagram6.Signal collection PRIMARYADJUSTMENT Figure 1. Cable Connection SERVICE OSDTROUBLESHOOTING GUIDE 1. NO POWERWaveforms 2. NO RASTER OSD IS NOT DISPLAYED - LIPS Waveforms 3. NO RASTER OSD IS NOT DISPLAYED - MSTARWaveforms 4. TROUBLE IN DPM5. POWER 6. Raster 6631900109A WIRING DIAGRAMOnly for training and service purposes LGE Internal Use OnlyEXPLODED VIEW Only for training and service purposesLGE Internal Use Only EXPLODED VIEW PARTS LIST Ref. NoDescription CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS REPLACEMENT PARTS LISTSAFETY Mark Only for training and service purposesTRANSISTOR Only for training and service purposesLGE Internal Use Only FILTERsTRANSISTORs & ICs Only for training and service purposesLGE Internal Use Only CAPACITORSOnly for training and service purposes LGE Internal Use OnlyTRANSFORMER LGE Internal Use Only SCHEMATIC DIAGRAM1. SCALER Only for training and service purposes2. POWER & WAFER Only for training and service purposesLGE Internal Use Only 3. INVERTER Only for training and service purposesLGE Internal Use Only 4. POWER Only for training and service purposesLGE Internal Use Only P/NO MFL43002807 Feb
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L1733TR, L1933TR specifications

LG Electronics has established itself as a prominent player in the display technology market, offering a diverse range of monitors catered to various user needs. Among their notable models are the L1733TR, L1753TR, L1953T, L1953TX, and L1933TR, each designed to deliver exceptional performance, vivid visuals, and ergonomic features ideal for both casual users and professionals.

The LG L1733TR and L1753TR models are 17-inch and 17-inch widescreen monitors respectively, boasting a resolution of 1280x1024 pixels. These monitors utilize a TFT LCD panel technology that results in outstanding clarity and color accuracy. With a quick response time, they are well-suited for gaming and video playback, reducing motion blur and ensuring a smooth viewing experience. The aspect ratio of 5:4 for L1733TR and 16:10 for L1753TR further enhances compatibility with a variety of applications, particularly those requiring precise graphics.

The L1953T and L1953TX models represent LG’s commitment to larger display solutions, featuring a 19-inch screen size. With a resolution of 1280x1024 pixels, these monitors deliver sharp images and vibrant colors, making them ideal for graphic design and multimedia tasks. The L1953TX variant includes an added feature of built-in speakers, allowing for an all-in-one multimedia experience without the need for external audio devices.

The L1933TR, another commendable entry in LG's lineup, exhibits a sleek design with a slim profile and narrow bezels, making it a contemporary choice for users keen on aesthetics. This 19-inch monitor uses advanced backlight technology to provide better energy efficiency and reduced power consumption compared to traditional LCDs. With a wide viewing angle, the L1933TR ensures consistent image quality from different perspectives, allowing for collaborative work and presentations.

In terms of connectivity, all models are equipped with a variety of input options including VGA and DVI, facilitating compatibility with an array of devices such as laptops and desktops. The inclusion of various ergonomic features such as adjustable stands and VESA mount compatibility enhances user comfort, making long hours of work less taxing on the body.

Overall, LG's L1733TR, L1753TR, L1953T, L1953TX, and L1933TR monitors exemplify the company’s dedication to providing innovative display solutions that combine cutting-edge technology with user-friendly features, catering to the diverse requirements of modern users.