LG Electronics 42LC2R, 37LC2R service manual Safety Precautions, General Guidance, RAY Radiation

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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 isolation 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 circuitry 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.

Keep wires away from high voltage or high temperature parts.

X-RAY Radiation

Warning:

The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the LCD PANEL.

For continued X-RAY RADIATION protection, the replacement panel must be the same type panel as specified in the Replacement Parts List.

To determine the presence of high voltage, use an accurate high impedance HV meter.

Adjust brightness, color, contrast controls to minimum. Measure the high voltage.

The meter reading should indicate

23.51.5KV: 14-19 inch, 26 1.5KV: 19-21 inch,

29.01.5KV: 25-29 inch, 30.0 1.5KV: 32 inch

If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

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.

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 position, 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 1Mand 5.2M.

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.

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 exposed 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 specified, 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

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Contents LCD TV Contents Do not use a line Isolation Transformer during this check Safety PrecautionsGeneral Guidance RAY RadiationElectrostatically Sensitive ES Devices Servicing PrecautionsDiode Removal/Replacement IC Remove/ReplacementSmall-Signal Discrete Transistor Removal/Replacement Power Output, Transistor Device Removal/ReplacementRequirement for Test SpecificationGeneral TV Specification Test method Application rangeSet Optical Feature General SpecificationModel Specification Component Video Input Y, PB, PR RGB Input PCRGB input DTV Mechanical Specification Hdmi Input PCHdmi input DTV LP62x Adjustment InstructionPCB assembly adjustment items SET assembly adjustment itemsC-G-M-R-BLUE-BLACK Adjustment of RF/AV/S-VIDEOAdjustment of Component Adjustment of RGBMSPG925FA Manual white Balance AVAuto white Balance AV MHVIDEO1SSM ARCPSM CSMKEY Funtion SVC RemoconNo power TroubleshootingNo Power SymptomCheck follow Check follow No Raster LCDCase of occur strange screen into specific mode Case of doesn’t display the OSD Symptom 1 LED is WhiteLCD TV Case of unusual situation from RF mode Case of doesnt work normally at specific input mode SymptomWhen set doesn’t display normally at RF , AV mode When set doesnt display nromally at Component, RGB modeCase of becomes unusual display from Hdmi mode VSC B/D Case of no soundBlock Diagram Exploded View 37LC2R Description Exploded View Parts LIST37LC2RExploded VIEW42LC2R Exploded View Parts LIST42LC2R Main Board Capacitor Replacement Parts List0CE476WK6DC Description / Specification Description / Specification Coil & Core & Inductor Description / Specification FET & Transistor Description / Specification Description / Specification Description / Specification Control Board PREAMP&LED Board Page Page Page Page Mar
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37LC2R, 42LC2R specifications

LG Electronics has long been a notable player in the consumer electronics market, particularly in the television segment. Among its standout models are the 42LC2R, 50PC1R, 37LC2R, and 42PC3R, each designed to provide excellent viewing experiences with various features and technologies.

Starting with the 42LC2R, this model is known for its impressive 42-inch screen size, offering Full HD 1080p resolution that ensures sharp, vibrant images. The incorporation of LG's Adaptive Contrast technology enhances picture clarity by adjusting the contrast levels based on the content being displayed. Additionally, the 42LC2R features a slim design that makes it an elegant addition to any living space, combined with a reliable viewing angle, providing a great experience from different positions in the room.

Moving on to the 50PC1R, this Plasma TV boasts a larger 50-inch display, ideal for immersive movie-watching and gaming sessions. The 50PC1R supports a 720p resolution, which, while not Full HD, still delivers rich colors and great depth thanks to its plasma technology. One of the key highlights of this model is its 600Hz Real Motion Display, which significantly reduces motion blur, perfect for fast-paced sports and action films. Furthermore, the model's built-in surround sound technology creates an enriched audio ambiance, complementing the visual excellence.

The 37LC2R model, a slightly smaller option at 37 inches, still packs a punch with its high-quality display. It retains the hallmark of LG's LCD technology, boasting clear and consistent picture quality. With the integration of LG’s proprietary technologies, like XD Engine, the 37LC2R efficiently upscales lower-resolution content to provide enhanced detail and clarity. Its energy-efficient features are also commendable, making it a more sustainable choice without compromising performance.

Lastly, the 42PC3R incorporates advanced plasma technology, offering both a 42-inch screen and Full HD resolution. It stands out with LG’s Infinite Contrast feature, enabling deeper blacks and brighter whites. This model also embraces LG's stylish design philosophy, ensuring it looks modern and attractive in any home environment. Furthermore, it includes multiple connectivity options, such as HDMI ports and USB inputs, which enhance versatility and ease of use, allowing users to connect a variety of external devices.

Overall, each model—42LC2R, 50PC1R, 37LC2R, and 42PC3R—showcases LG Electronics' commitment to delivering high-quality displays, innovative technologies, and functional designs. Whether for enjoying high-definition movies or gaming, these televisions promise to enhance the viewing experience while adapting to various consumer needs.