File name 32ln51xx_32ln5100_32ln510y_32ln5110_32ln5120_32ln5130_32ln5150_chassis_lb35b.pdf
Internal Use Only
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LED TV SERVICE MANUAL
CHASSIS : LB35B
MODEL : 32LN51**
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67732801 (1302-REV00)
Printed in Korea
CONTENTS ... 2 SAFETY PRECAUTIONS ... 3 SERVICING PRECAUTIONS... 4 SPECIFICATION ... 6 ADJUSTMENT INSTRUCTION ... 9 BLOCK DIAGRAM... 13 EXPLODED VIEW ... 14 SCHEMATIC CIRCUIT DIAGRAM ...
Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes
LGE Internal Use Only
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 Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.
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 1 W), keep the resistor 10 mm away from PCB. Keep wires away from high voltage or high temperature parts.
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 1.5 K / 10 watt resistor in parallel with a 0.15 uF 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 m