User manual LG 60LN575V

[. . . ] 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. 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. [. . . ] CAUTION: Work quickly to avoid overheating the circuit board printed foil.  llow the soldering iron tip to reach a normal temperature A (500 °F to 600 °F) b.  irst, hold the soldering iron tip and solder the strand F against the component lead until the solder melts.  uickly move the soldering iron tip to the junction of the Q component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil. 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.  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. (Use this technique only on IC connections).  arefully remove the damaged copper pattern with a sharp C knife. (Remove only as much copper as absolutely necessary).  arefully scratch away the solder resist and acrylic coating (if c used) from the end of the remaining copper pattern.  end a small "U" in one end of a small gauge jumper wire and B carefully crimp it around the IC pin.  oute the jumper wire along the path of the out-away copper R pattern and let it overlap the previously scraped end of the good copper pattern. [. . . ] G 3) nput the Factory model name(ex 24LB4500) or Serial I number like photo. (DTV country only) → Buyer model displayed. 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. * Note : Manual W/B process using adjusts Remote control. [. . . ]