Haier 55DA5550 Service Manual

To turn on the TV, press the POWER button on the front panel.

To change the input source, press the INPUT button on the front panel.

First, verify if the television is properly plugged in and supplied with power. Check if electricity is available. If the issue persists, try restarting the television or changing the signal input to TV input by pressing the SOURCE button.

To troubleshoot poor sound, verify that the sound system is set correctly. Refer to the user manual for instructions on how to adjust the sound settings.

The TPA6132A2RTER(UA2) is an Audio Amplifier for headphones. It is responsible for amplifying the audio signal for headphone output.

To troubleshoot audio issues, start by verifying if the speakers are broken. If the speakers are fine, check the main board to ensure it has the correct input for the source you are using. Next, inspect the corresponding audio input circuit. If these components are functioning correctly, verify if UA4 has the right output and power input. If UA4 is fine, check CN7 input. If the problem still persists, you may need to replace the main board.

To troubleshoot this issue, first verify if the same problem exists in other channels. If the problem persists, check out of the picture and sound system of this channel. If the sound system is incorrect, change the channel to the right sound system (PAL/BG/SECAM/L). If the issue still persists, refer to the relative instructions in the manual for color adjustment. If the problem continues, update the software and make a reboot, or change the mainboard.

A 'Vertical color line' that appears light or dark forever on the screen could be due to a TCP failure, specifically TCP cracking or cracking.

The backlight shutdown issue could be due to a short between the lamp housing and the wire, which causes the system to consume too much power. It might also be due to a mechanical noise issue in the backlight unit.

The backlight appearing darker than normal could be due to a short between the wire and the electrode, or it could be caused by a mechanical noise issue in the backlight unit.