Haier LE50B7000 Service Manual

To enter the Service Mode, press the Menu button, then input '8893'. The system will enter the factory mode menu.

The 'Burn Mode' on the Haier LE50B7000 TV allows you to open or close the burn-in mode. This feature is typically used to test the display by running a specific pattern to ensure all pixels are functioning correctly over an extended period.

The TPA3110D2 (UA1) component is the Audio Amplifier in the Haier LE50B7000. It is responsible for amplifying the audio signals to drive the speakers.

First, verify if the power has a 5Vstb output. If not, change the power supply. If it does, check if CN4 Pin3/4 has a 5V input. If not, change the power board. If it does, check if CN4 Pin1 has a 12V input. If not, change the power board. If it does, verify if the DC/DC converters have the right output. If not, change the corresponding DC/DC converter. If all checks are correct, change the software. If problems persist, change the mainboard.

To troubleshoot the power board, first check if CN4 Pin3/4 has a 5V input. If not, change the power board. If it does, check if CN4 Pin1 has a 12V input. If not, change the power board. If it does, verify if the DC/DC converters have the right output. If not, change the corresponding DC/DC converter. If all checks are correct, change the software. If problems persist, change the mainboard.

If you are experiencing a black and white picture for some channels, first verify if the problem exists on other channels. If the issue is isolated to a specific channel, check the picture and sound system settings for that channel. Ensure the sound system is set to the correct format (e.g., NTSC MN). If the problem persists, refer to the manual for color adjustment instructions. If you still have issues, consider updating the software and rebooting the TV, or changing the mainboard.

If updating the software and rebooting the TV does not resolve the black and white picture issue, you may need to change the mainboard. This is a more advanced troubleshooting step and may require professional assistance.

This issue could be due to a problem with the eyewinker inside the polarizer. It might be caused by a tine or rigidity issue.

A bright dot or dark dot on the panel could be due to a dot defect. This could be caused by a chip losing action, an IC short or jointing bad, or a bad connection between the panel and VSC.

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 could also be due to a mechanical noise issue in the backlight unit.