User manual LG 28LB457B

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Manual abstract: user guide LG 28LB457B

Detailed instructions for use are in the User's Guide.

[. . . ] Only for training and service purposes -2- LGE Internal Use Only SAFETY PRECAUTIONS 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. General Guidance An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. [. . . ] CAUTION: Work quickly to avoid overheating the circuit board printed foil.  losely inspect the solder area and remove any excess or C splashed solder with a small wire-bristle brush. -4- LGE Internal Use Only IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above.  esolder and straighten each IC lead in one operation by D gently prying up on the lead with the soldering iron tip as the solder melts.  raw away the melted solder with an anti-static suction-type D solder removal device (or with solder braid) before removing the IC.  arefully bend each IC lead against the circuit foil pad and C solder it.  emove the defective transistor by clipping its leads as close R as possible to the component body.  end into a "U" shape the end of each of three leads remainB ing on the circuit board.  onnect the replacement transistor leads to the corresponding C leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection.  arefully remove the transistor from the heat sink of the circuit C board.  emove defective diode by clipping its leads as close as posR sible to diode body.  bserving diode polarity, wrap each lead of the new diode O around the corresponding lead on the circuit board. nspect (on the circuit board copper side) the solder joints of I the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder.  lip each fuse or resistor lead at top of the circuit board hollow C stake.  ecurely crimp the leads of replacement component around S notch at stake top. S CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. [. . . ] *Manual Download (Model Name and Serial Number) If the TV set is downloaded By OTA or Service man, Sometimes model name or serial number is initialized. (Not always) There is impossible to download by bar code scan , so It need Manual download. G 3) nput the Factory model name(ex 24LB4500) or Serial I number like photo. Work instructions) 1) TV 2) AV (SCART/CVBS) 3) COMPONENT (480i) 4) HDMI(PC : 1366 x 768 @ 60Hz) * Display and Sound check is executed by Remote control * Caution :  ot to push the INSTOP KEY after completion if N the function inspection. [. . . ]


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