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Essential safety parts replacement with specified components to prevent hazards.
Procedure for checking AC leakage current on exposed metallic parts.
Procedure for checking AC leakage current using a specific circuit.
Procedure for safely removing and replacing integrated circuits from the circuit board.
Methods for removing and replacing small-signal and power transistors.
Troubleshooting flowchart for diagnosing and resolving "No Power" issues.
Step-by-step checks for power-related problems, including cord, fuse, and connections.
Troubleshooting flowchart for diagnosing and resolving "No Raster" (no picture) issues.
Steps to check for raster issues, including module, inverter, and cable connections.
Troubleshooting for unusual display issues in TV/CATV input modes.
Troubleshooting flowchart for diagnosing and resolving "No Sound" issues.
Essential safety parts replacement with specified components to prevent hazards.
Procedure for checking AC leakage current on exposed metallic parts.
Procedure for checking AC leakage current using a specific circuit.
Procedure for safely removing and replacing integrated circuits from the circuit board.
Methods for removing and replacing small-signal and power transistors.
Troubleshooting flowchart for diagnosing and resolving "No Power" issues.
Step-by-step checks for power-related problems, including cord, fuse, and connections.
Troubleshooting flowchart for diagnosing and resolving "No Raster" (no picture) issues.
Steps to check for raster issues, including module, inverter, and cable connections.
Troubleshooting for unusual display issues in TV/CATV input modes.
Troubleshooting flowchart for diagnosing and resolving "No Sound" issues.
This document is a service manual for LG LCD TVs, specifically models 32LG5000, 32LG5010, 32LG5020, and 32LG5030, all based on the LD84A chassis. It provides comprehensive information for technicians on servicing, troubleshooting, and maintaining these television sets.
The manual begins with crucial safety precautions, emphasizing the importance of using an isolation transformer during servicing to protect both the technician and the device from electrical shocks and damage. It highlights that many electrical and mechanical parts in the chassis have special safety-related characteristics, identified by a specific symbol in the Schematic Diagram and Replacement Parts List. These parts must be replaced with the manufacturer's recommended components to prevent hazards like shock or fire. Modifications to the original design are strictly prohibited without manufacturer permission.
Detailed instructions are provided for various servicing procedures, including replacing fuses, high-wattage resistors, and keeping wires away from high-voltage or high-temperature parts. Before returning a serviced receiver to a customer, an AC leakage current check is mandatory to ensure the set is safe to operate. This check involves both a "cold check" (with the AC plug removed) and a "hot check" (with the AC cord plugged directly into an outlet, without an isolation transformer). The hot check involves measuring AC voltage across a resistor connected between earth ground and exposed metallic parts, with specific voltage limits to ensure safety.
Further servicing precautions cover general guidance, such as always unplugging the AC power cord before removing or reinstalling components, disconnecting electrical connections, or connecting test substitutes. It warns against incorrect polarity installation of electrolytic capacitors, which can lead to explosion hazards. High voltage testing should only be done with appropriate meters and probes, and spraying chemicals on or near the receiver is discouraged. Cleaning electrical contacts requires a specific mixture of Acetone and isopropyl alcohol. The manual also advises against defeating B+ voltage interlocks and emphasizes the correct installation of solid-state device heat sinks. Proper grounding procedures for test receivers are outlined, including connecting the ground lead first and removing it last.
A significant section is dedicated to handling Electrostatic Sensitive (ES) Devices, such as integrated circuits and field-effect transistors. Technicians are instructed to drain any electrostatic charge from their bodies by touching a known earth ground or wearing a discharging wrist strap before handling ES devices. Assemblies equipped with ES devices should be placed on conductive surfaces after removal. Only grounded-tip soldering irons and anti-static solder removal devices should be used. Freon-propelled chemicals are to be avoided as they can generate static charges. ES devices should remain in their protective packaging until immediately before installation, and protective material should be touched to the chassis or circuit assembly before removal. Minimizing bodily motions when handling unpackaged ES devices is also recommended to prevent static electricity generation.
General soldering guidelines are provided, including using a grounded-tip, low-wattage soldering iron with appropriate tip size and temperature (500°F to 600°F), RMA resin-core solder (60% tin/40% lead), and keeping the tip clean and tinned. Thorough cleaning of surfaces to be soldered is essential, and freon-propelled spray-on cleaners are to be avoided. Specific techniques for unsoldering and soldering are detailed, emphasizing quick work to prevent overheating the circuit board foil.
The manual also covers specific component removal and replacement procedures. For ICs with slotted holes, a technique involving gently prying up leads while melting solder and then drawing away melted solder with an anti-static device is described. For "Small-Signal" Discrete Transistors, the leads are clipped, bent into a "U" shape, and then connected to replacement transistor leads, crimped, and soldered. Power Output Transistor Devices require heating and removing solder, removing heat sink screws, and then carefully removing and inserting the transistor before soldering and replacing the heat sink. Diode replacement involves clipping the old diode, bending remaining leads, wrapping new diode leads, crimping, and soldering. Fuse and Conventional Resistor replacement involves clipping leads, crimping replacement component leads around the stake, and soldering, while maintaining original spacing to prevent excessive temperatures.
Circuit board foil repair procedures are outlined for both IC connections and other connections. For IC connections, damaged copper pattern is removed, solder resist and acrylic coating are scratched away, a jumper wire is bent and crimped around the IC pin, and then routed and soldered to the good copper pattern. For other connections, the defective copper pattern is removed, and an insulated jumper wire is connected from the nearest component on one side of the pattern break to the nearest component on the other side, ensuring it does not touch other components or sharp edges.
The adjustment instruction section details the process for setting up and calibrating the TV. This includes an application range for the LD84A chassis LCD TVs and specific designation requirements for adjustments, such as power adjustment (free voltage), magnetic field conditions (nil), input signal unit (product specification standard), and operating conditions (after 5 minutes heat run at 25±5°C and 65±10% relative humidity, with 220V, 60Hz input voltage). Required adjustment equipment includes a Color Analyzer, Pattern Generator, DDC Adjustment Jig, and SVC remote controller. A warning is given not to press the "IN STOP KEY" after completing the function inspection.
The main PCB check process involves APC (After Manual-Insult, executing APC) and a detailed download procedure using the "Mstar ISP Utility" program. This includes configuring settings, auto-detecting, connecting, reading, and loading the download file. USB download is also described, where a USB stick is inserted, and the system automatically detects and copies update files, followed by an updating process. After updating, technicians are instructed to check the updated version and tool option, noting that if a higher version is downloaded, channel data might be lost, requiring channel recovery.
ADC (Analog-to-Digital Converter) processes for PC input and Component input are explained. For PC input ADC, auto RGB Gain/Offset adjustment is performed using a pattern generator, followed by confirmation of EEPROM addresses and ADC values. Manual ADC process using a service remote control is also detailed. Similar steps are provided for Component input ADC.
Function checks involve verifying display and sound for various input sources, including TV, AV (SCART1/SCART2/S-VHS/CVBS), COMPONENT (480i), RGB (PC: 1024 x 768 @ 60hz), HDMI, and PC Audio In, all executed via the remote controller.
The total assembly line process includes adjustment preparation, specifying conditions for the W/B (White Balance) Equipment (CA210, CH 9, Inner pattern 85IRE) and the process for adjusting color temperature (Cool, Medium, Warm) using I2C commands. Manual W/B adjustment via the service remote is also described. After all adjustments, tool option and area option values must be compared with the BOM, and if correct, the AC cable can be unplugged.
DDC EDID (Extended Display Identification Data) Write procedures for RGB (128Byte) and HDMI (256Byte) are outlined, involving connecting signal cables and writing EDID data to EEPROM, followed by verification. Serial number writing via RS-232C is also covered, with a requirement to check the serial number in the SET UP menu's Diagnostics. The manual provides detailed tables of Analog Data (128Byte) and Digital Data (HDMI-1, HDMI-2, HDMI-3 256Byte) in HEXA value, indicating changeable data for serial number, month, year, and checksum.
HDCP (High-Bandwidth Digital Contents Protection) SETTING for the Scaler (Mstar) is explained, involving connecting a D-sub signal cable, inputting HDCP key, and confirming picture display with MSPG925. The outgoing condition configuration specifies that pressing the IN-STOP key on the SVC remocon should cause the Red LED to blink alternatively, followed by automatic turn-off, and warns against turning off AC power during blinking. Internal pressure confirmation ensures the power board's AC block and GND are normally impacted at specified voltage levels.
The troubleshooting section provides flowcharts for common issues. "No Power" troubleshooting involves checking the power cord, line filter, power board cable, PSU fuse, and connections between PSU and Main B/D. If issues persist, it suggests replacing the PSU or main board. "No Raster" troubleshooting covers scenarios where there's no OSD or image, and the front LED is blue. It guides the technician to check for minute discharge at the module, inverter status, voltage outputs, link cable normality, and IC801's output, leading to checking the LCD Module, reconnecting panel link cables, or replacing the main board or ICs. A caution advises checking S/W version and White Balance value before changing the main board, followed by S/W download and setting White Balance.
"Unusual display from TV/CATV mode" troubleshooting involves checking video output of the Tuner, input voltage, I2C communication, and LVDS cable connection, leading to checking the power, tuner, or replacing the main board or IC. A similar flowchart is provided for "Unusual display from DTV mode."
"Unusual display from AV1/AV2 (SCART) mode" and "AV3 (SIDE AV) mode" troubleshooting involves checking video input of SCART/RCA jacks, input source, and waveform of switching ICs, leading to checking the input source, IC700, or replacing the main board. "Unusual display from Component mode" follows a similar logic, checking video input of Component jacks and input source.
"Unusual display from RGB mode" troubleshooting checks video input of RGB jack, waveform of switching IC, and input source, leading to checking IC700 or replacing the main board. "Unusual display from HDMI 1/2/3 mode" involves checking video input of HDMI jacks, DDC communication lines, HDCP communication lines, and waveform of switching IC, leading to checking ICs or replacing the main board.
Finally, "No Sound" troubleshooting addresses scenarios where the LED is blue, and there's a screen display but no sound. It guides the technician to check if the speaker is "on" in the menu, if all input has no sound, if only HDMI has no sound (requiring EDID data download), if the speaker cable is normal, and if IC100 and IC1000 operate normally, leading to checking the tuner, speaker cable, or replacing ICs or the main board. A caution reiterates checking S/W version and White Balance value before changing the main board.
The manual also includes a block diagram of the TV's internal components and an exploded view for easy identification of parts during assembly and disassembly.
General
