Haier 21F3A-T Service Manual

The 21F3A-T television has an auto search feature that allows it to scan and store up to 218 program presets. To use this feature, refer to the on-screen help function for step-by-step instructions.

The child lock function on the 21F3A-T television is designed to restrict access to certain features or channels. To activate the child lock, refer to the on-screen help function for detailed instructions on how to set it up and customize the restrictions.

For troubleshooting and maintenance, refer to page 16 of the manual. This section provides guidance on how to address common issues and perform necessary maintenance.

If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a specified one as recommended in the manual. This ensures the safety and proper functioning of the TV.

To protect the TV set from electrical hazards during thunder and lightning, pull out the plug from the AC outlet and the antenna plug from the cover of the TV set. This will help prevent the TV from firing and electric shock.

Always unplug the receiver AC power cord from the AC power source before removing or reinstalling any component, circuit board module, or any other assembly of the receiver.

The rear panel of the Haier 21F3A-T TV features several video input terminals, including the Video output terminal, Video Y input terminal, Video Cb input terminal, S-VIDEO input terminal, and Video Cr input terminal. These terminals allow you to connect various video sources to the TV.

To perform an auto search and store programs, press the MENU button on the remote controller. Use the “ ” key to call up the “tune program” menu on the screen. Then press the menu “ ” item to select it. Use the “ ” key to select the bar “auto search program” and press the “ ” to confirm. If you want to stop, press the “ ” key.

The sound power amplifying section of the 21F3A-T color TV set involves the integrated circuit N701, which is a TDA2611.

If your Haier 21F3A-T does not produce any light or sound, first check if the fuse is normal. If the fuse is abnormal, replace it. If the fuse is normal, check if the voltage (110V, 180V, etc.) is normal. If the voltage is normal, check components VD503~VD506, C507, V513, etc. If these components are normal, check the collector voltage of V552 to see if it is 27V. If the voltage is normal, check if the 9V and 5V voltages are normal. If all voltages are normal, the failure might be due to the horizontal unit or N204. Test all terminal resistance of the load. If the resistance is abnormal, check the control voltage of V572 or the CPU power pin. If the control voltage is abnormal, check the switch power unit. If the switch power unit is abnormal, check the rectifying tube. If the rectifying tube is normal, check the loader and components N902, V905, etc. If any of these components are abnormal, consider changing the rectifying diode.