This document is a service manual for the LG COLOR TV, specifically models 29FC2RNX/RNB and 29FC2RNX/RNB-TF, built on the MC-05HB chassis. It provides comprehensive information for servicing, adjustment, and maintenance of the television set.
Function Description
The LG COLOR TV is a television receiver designed to display video and audio content from various sources. It supports multiple receiving systems, including PAL, SECAM, and NTSC, accommodating different broadcast standards across various regions. The TV features a tuning system (FVS 100/200 Program) with an option for different screen sizes, including 4:3 Flat 29" and Wide Flat 32".
The television can receive signals from:
- RF Input: Standard VHF, UHF, and CATV channels.
- AV Inputs (AV IN3): Connects external audio/video equipment via RCA sockets.
- S-VIDEO/AUDIO IN SOCKETS (S-AV): For S-VIDEO VCRs, providing separate video and audio connections.
- Component Input: Supports 480i/480P, 576i/576P, 1080i 50Hz/60Hz, and 720P 50Hz/60Hz signals, indicating compatibility with various progressive scan and high-definition sources.
The TV's control system allows for operation via a remote control handset and front panel buttons. Key functions include power on/off, channel selection, volume adjustment, picture format changes (ARC - Aspect Ratio Control), and menu navigation. Specific features like "Turbo Picture/Sound" and "Picture Status Memory (PSM)" are available for quick picture and sound mode selection. The manual also details optional features such as Teletext, Picture-in-Picture (PIP), and VCR control.
The internal block diagram illustrates the signal flow, including the VCT-P (Video and Audio) processor, memory (16M×2), de-interlacer, 2-channel scaler, picture enhancer, MSP (Multi-Standard Processor), and CPU. The audio section includes a TDA7297 10W×2 Sound Amplifier for speakers and a headphone output. An optional FM Transmitter output for CTV is also mentioned for wireless sound models.
Important Technical Specifications
- Chassis: MC-05HB
- Screen Size: 4:3 Flat 29", Wide Flat 32" (depending on model)
- Receiving Systems: PAL, SECAM BG, PAL/SECAM DK, PAL I, SECAM-L/L', NTSC M, NTSC M/PB, PAL BG, DK, I, SECAM BG, DK.
- Component Input Support: 480i/480P, 576i/576P, 1080i 50Hz/60Hz, 720P 50Hz/60Hz.
- Available Channels:
- VHF: E2~E12, UHF: E21~E69, CATV: S1~S20, HYPER: S21~S41 (for EU models)
- VHF: 2~13CH, UHF: 14~69CH, CATV: 01~125CH (for Non-EU models)
- Input Voltage: 110-240V~, 50/60Hz (Wide Range) or 220V~ / 230V~, 50/60Hz (Narrow), depending on market.
- Operating Environment: Temperature 0~40°C, Humidity below 85%.
- Storage Environment: Temperature -20~60°C, Humidity below 85%.
- High Voltage (HV) Measurement (for X-RAY Radiation protection):
- 23.5 ± 1.5KV for 14-19 inch
- 26 ± 1.5KV for 19-21 inch
- 29.0 ± 1.5KV for 25-29 inch
- 30.0 ± 1.5KV for 32 inch
- Audio Output: TDA7297 10W×2 Sound Amplifier.
- Safety Standards: IEC60065, EMC: EN55020, EN55013.
Usage Features
The television offers a range of user-friendly features accessible through its remote control and front panel:
- Remote Control Handset: Provides full control over all TV functions, including power, number buttons for direct channel access, ARC for picture format adjustment, Turbo Picture/Sound, program up/down, volume up/down, menu navigation, OK button for selection, VCR buttons (optional), I/II for language/sound output, PSM for preferred picture settings, Sleep timer, Main Still (freezes picture), Teletext buttons (optional), Mute, and TV/AV mode selection.
- Front Panel Controls: Includes Main Power (on/off), Power/Standby Indicator, Menu, OK, Volume Up/Down, Program Up/Down, and Remote Control Sensor.
- Side Panel Connections: Features Audio/Video In sockets (AV IN3), S-VIDEO/AUDIO IN sockets (S-AV), and optional Headphone Socket.
- EYE Function (optional): Automatically adjusts picture settings based on surrounding light conditions.
- PIP (Picture-in-Picture) (optional): Allows viewing a sub-picture alongside the main picture, with controls for switching PIP on/off, selecting sub-picture program, swapping main/sub pictures, input selection, size adjustment, still frame, and position relocation.
- Aspect Ratio Control (ARC): Enables changing the picture format to suit different content or preferences.
- Sound Status Memory (SSM): Recalls preferred sound settings.
Maintenance Features
The service manual provides detailed instructions for technicians to perform various adjustments and troubleshooting steps, ensuring the proper functioning and safety of the device:
- Safety Precautions: Emphasizes the importance of using an isolation transformer during servicing, replacing safety-related parts with specified components, maintaining proper resistor spacing (10mm for high wattage), keeping wires away from high voltage/temperature parts, and careful handling of the picture tube. It also includes warnings regarding X-RAY radiation and procedures for checking high voltage.
- AC Leakage Current Check: Detailed steps for both cold and hot checks to ensure the set is safe to operate without electrical shock hazards.
- Software Download: Instructions for connecting a JIG to the digital board, supplying power, and executing a program for software updates, including erasing and writing flash memory.
- Adjustment Instructions:
- DVCO Adjustment: Adjusts the crystal oscillator frequency of the VCTP IC.
- Temporary Screen Voltage Adjustment: Adjusts screen volume to eliminate horizontal lines.
- Focus Adjustment: Involves adjusting lower and upper Focus volumes of the FBT (Flyback Transformer) for optimal vertical line focus.
- Purity & Convergence Adjustment: A multi-step process including CPT assembly, heat run, degaussing, STC pre-adjustment, purity adjustment (using red raster and magnets), and convergence adjustment (using cross hatch pattern and 4/6 pole magnets). This ensures accurate color display and geometric alignment.
- Screen Voltage Adjustment: Performed in no RF signal condition or with a digital pattern, adjusting screen volume until horizontal lines disappear.
- White Balance Adjustment: Utilizes a White Balance Meter (CRT Color Analyzer) and remote control to adjust RGB W-B mode, including R-Drive, G-Drive, B-Drive, R-Cutoff, G-Cutoff, and B-Cutoff, to achieve specified color coordinates (e.g., 13500K or 9000K).
- Deflection Data Adjustment: Manual adjustment of various parameters like Vertical Linearity (VL), Vertical Amplitude (VA), Vertical S Correction (SC), Vertical Shift (VS), Horizontal Shift (HS), East-West Horizontal Width (EW), BOW, ANG, East-West Parabola (EP), Upper Corner Correction (CRNU), and Lower Corner Correction (CRNL). These adjustments are crucial for geometric accuracy and picture linearity.
- OPTION Setting: Configures various functions based on the model, such as Text/Caption, VCTP, TOP/FLOF Text, ACMS, CH+AU, Boost, PIP, SYS, FMTRM, A2 ST, HDEV, VOL, WOOF, HPHON, SCART, WIDE, NCOMP, 3DCOM, BLUBK, XD, TILT-NOTE, C/PTV, AUTOCVG, 32 INCH, HOTEL, EYE, TBIDX, DGIDX, MOVE SPK, and Language settings.
- Troubleshooting: Provides flowcharts for common issues like "No Picture (sound ok)", "No Sound (picture ok)", "No PIP", "No power", and "No raster". These guides direct technicians to check specific waveforms, voltages, and components (ICs, Qs, Tuner, Fuses, etc.) on the Main, Digital, and Power boards.
- Printed Circuit Board (PCB) Layouts: Includes detailed diagrams of the Main, Digital (Top and Bottom), Power+Control, and AC Input boards, along with the CPT and Side-A/V boards, to aid in component identification and location.
- Exploded View and Parts Lists: Provides an exploded diagram of the TV assembly and comprehensive lists of replacement parts, including LOCA. NO, PART NO, and DESCRIPTIONS for ICs, Transistors, Diodes, Capacitors, Coils & Inductors, Switches, Sparks, Filters & Crystals, Connectors, and Miscellaneous parts. Safety-critical components are identified with a special mark (A).
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