To Next PageTo Next Page
Need help?Do you have a question about the LG RF-21FA20PQ and is the answer not in the manual?
Key safety components must be replaced with specified parts to prevent hazards like shock, fire, or radiation.
Servicing guidelines including isolation transformer use, fuse replacement, and careful handling of picture tubes.
Identifies X-RAY source and specifies replacement tube requirements for continued protection.
Procedure to measure AC voltage across a resistor to ensure the set is safe from electrical shock.
Explains the functions of the buttons on the remote control handset.
Notes on power disconnection and isolation transformer use during servicing.
Safety warnings for handling the picture tube due to vacuum and fragility.
Essential safety measures to follow during all adjustment procedures.
Procedure for adjusting the RF Automatic Gain Control.
Steps to adjust screen voltage using the Flyback Transformer (FBT).
Method for adjusting the picture focus on the CRT screen.
Details on entering service mode and adjusting deflection parameters.
Adjustment for controlling the horizontal picture width.
Procedure for adjusting white balance in service mode.
Troubleshooting steps for no power when the SMPS is active.
Troubleshooting steps for no power when the SMPS is not active.
Troubleshooting steps for issues with vertical picture deflection.
Troubleshooting steps for diagnosing missing heater voltage.
Troubleshooting steps for diagnosing a black screen issue.
Troubleshooting steps for geometric barrel distortion in the picture.
Troubleshooting steps for no sound when the picture is normal.
General
