LG 55NANO7 TP Series - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document is a service manual for an LG LED TV, specifically models 55NANO7*TP* and 55NANO75VPA, built on the UB13D chassis. It provides comprehensive information for servicing, including safety precautions, technical specifications, software update procedures, block diagrams, exploded views, assembly/disassembly guides, and troubleshooting.

Function Description:

The device is an LG LED TV designed for home entertainment. It supports various broadcasting systems and external input formats, offering a wide range of connectivity options for different media sources. The TV is equipped with smart features, including software updates via USB or Network Service Update (NSU), and can be controlled using a standard remote or a Magic Remote (MR21).

Important Technical Specifications:

Chassis: UB13D
Models: 55NANO7*TP*, 55NANO75VPA
Market: Oceania / Asia / Middle East / Africa
Broadcasting Systems:
- Digital TV: DVB-T/T2, DVB-C, DVB-S/S2 (only *V* models support DVB-S/S2)
- Analogue TV: PAL B/B, PAL B/G, PAL D/K, PAL-I, SECAM B/G, SECAM D/K, NTSC-M
Program Coverage:
- ATV & DVB-T/T2: 3,000EA (only *V* models support DVB-S/S2)
- DVB-S/S2: 6,000EA
Maximum Storable Programmes:
- DVB-S/S2: 6,000
- DVB-C, DVB-T/T2, Analogue TV: 3,000
Receiving System:
- Analogue: Upper Heterodyne
- Digital: COFDM, QAM
HDMI Input: 4 ports (HDMI 1, 2, 3, 4) supporting PC/DTV formats. HDMI 2 supports ARC.
USB Input: Supports My Media (Movie/Photo/Music List) or SVC.
SPDIF Out: Optical Audio out.
Headphone Out: Supports all inputs (depends on model).
Ethernet Connect: Yes.
AV Input: CVBS, Audio LR (only for INDIA models).
Power Voltage: Standard input voltage (AC 100-240 V~, 50/60 Hz).
Operating Temperature: 25 °C ± 5 °C (77 °F ± 9 °F) for standard, 40 °C ± 2 °C for CST.
Relative Humidity: 60 % ± 10 %.

Usage Features:

Software Update: The TV supports software updates via USB or Network Service Update (NSU). Users can check for updates, initiate installation, and monitor the progress through the "Menu → All Settings → Support → Software Update" interface. The update process requires the TV to restart to apply the new version.
Remote Control: The manual details how to use the service remote control for adjustments and accessing various functions, including power on/off, input selection, picture modes, and test patterns.
External Input Formats: The TV is compatible with a wide range of HDMI DTV and PC modes, supporting resolutions from 640x350 up to 7680x4320 (8K for specific models).
Troubleshooting Guide: A comprehensive guide is provided for common issues such as video errors (no video, picture broken, color error), power errors (no power, off while viewing), audio errors (no audio, wrecked audio), and function errors (remote control, Wi-Fi, external device recognition).

Maintenance Features:

Safety Precautions: Emphasizes the importance of using an isolation transformer, replacing parts with specified components, keeping wires away from high voltage/temperature parts, and performing AC leakage current checks. It also includes guidelines for handling electrostatically sensitive (ES) devices and general soldering techniques.
Assembly / Disassembly Guide: Detailed instructions with illustrations are provided for disassembling and assembling the back cover, module, SPCB (Signal Processing Circuit Board), guide panel, diffuser plates, reflector sheet, LED array, and other components. This includes specific steps for removing screws, releasing latches, and handling delicate parts like the LED array and panel.
Component Replacement: The manual outlines procedures for replacing various components, including ICs, transistors, diodes, fuses, resistors, and circuit board foil repair.
Diagnostic Tools: The service manual describes how to use the IN-START menu and ADJ key on the service remote control to check software versions, white balance values, signal strength, and various test patterns for diagnosing display issues.
Power Check Sequence: Detailed steps for checking power input voltage, PWR-ON status, 13.2V levels, DRV_ON status, and LED voltage are provided to diagnose power-related problems.
Error Symptom Analysis: The troubleshooting section categorizes errors by high and mid-level symptoms, offering flowcharts and detailed explanations for diagnosis and repair. Examples of image errors (color smear, spread, darkness, screen stop) and main board/module related issues (screen noise, dark picture, broken picture, vertical bars, internal foreign matter) are illustrated to aid in visual diagnosis.