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Many electrical and mechanical parts in this chassis have special safety-related characteristics. 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.
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.
Keep wires away from high voltage or high temperature parts. Before returning the receiver to the customer,. 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. 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.
Plug the AC cord directly into the AC outlet. Do not use a line Isolation Transformer during this check. Connect 1. Any voltage measured must not exceed 0. 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.
If unforeseen circumstances create conflict between the. Remember: Safety First. General Servicing Precautions 1. Always unplug the receiver AC power cord from the AC power. Removing or reinstalling any component, circuit board. Disconnecting or reconnecting any receiver electrical plug or. Connecting a test substitute in parallel with an electrolytic. Test high voltage only by measuring it with an appropriate high. Do not test high voltage by "drawing an arc". Do not spray chemicals on or near this receiver or any of its.
Unless specified otherwise in this service manual, clean. Unless specified otherwise in this service manual, lubrication of contacts in not required. Always connect the test receiver ground lead to the receiver. Always remove the test receiver ground lead last. Use with this receiver only the test fixtures specified in this service manual.
Electrostatically Sensitive ES Devices Some semiconductor solid-state devices can be damaged easily by static electricity. Such components commonly are called. Electrostatically Sensitive ES Devices. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity.
Immediately before handling any semiconductor component or. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the unit under test.
After removing an electrical assembly equipped with ES. Use only a grounded-tip soldering iron to solder or unsolder ES. Use only an anti-static type solder removal device. Some solder. Do not use freon-propelled chemicals. These can generate. Do not remove a replacement ES device from its protective. Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material. Immediately before removing the protective material from the.
Minimize bodily motions when handling unpackaged. General Soldering Guidelines 1. Use a grounded-tip, low-wattage soldering iron and appropriate. Use an appropriate gauge of RMA resin-core solder composed. Keep the soldering iron tip clean and well tinned. Thoroughly clean the surfaces to be soldered. Use a mall wire-. Do not use freon-propelled spray-on cleaners. Use the following unsoldering technique. Allow the soldering iron tip to reach normal temperature.
Heat the component lead until the solder melts. Quickly draw the melted solder with an anti-static, suction-. Use the following soldering technique. Allow the soldering iron tip to reach a normal temperature. First, hold the soldering iron tip and solder the strand against. Quickly move the soldering iron tip to the junction of the. Closely inspect the solder area and remove any excess or.
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LG 32LK450U LCD TV overview
Many electrical and mechanical parts in this chassis have special safety-related characteristics. 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. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.
LG 32LK450U Owner's Manual
Lg 32Lk450U Owner S Manual