Haier LT19Z6 Service Manual

To use the remote control, refer to section 2.1 of the manual titled 'The Use of Remote Control' on page 5.

To connect the Haier LT19Z6 LED TV, follow the instructions provided in section 2.3 titled 'How to Connect' on page 22.

If the main board standby power supply is not working, you should first check U751. If that is not the issue, then check U401. If both components are functioning correctly, then check the I2C bus communication.

If the OSD is unstable or not working, first check if the Key Pad Board is connected normally. If it is, then check if the Button Switch is functioning properly. If both are normal, then the Key Pad Board might need to be replaced.

To adjust the white balance on your Haier LT19Z6, follow these steps: 1. Select source as 'YPbPr'. 2. Set Contrast = 58, Brightness = 48, and Color = 58 in normal menu mode. 3. Apply an 80% white pattern or Flat80 pattern using a component video generator. 4. Enter the factory mode menu by pressing MENU + Numeric keys 1999. 5. Apply a Flat pattern (80% white pattern). 6. Set the color temperature to 'NORMAL' and adjust the Scaler R Gain, Scaler G Gain, and Scaler B Gain values to meet the 'NORMAL' color coordinates specification. Store these values to NVM. 7. Repeat steps 5 and 6 for 'COOL' and 'WARM' color temperatures, adjusting the Scaler R Gain, Scaler G Gain, and Scaler B Gain values accordingly and storing them to NVM.

The color temperature specifications for the Haier LT19Z6 are as follows: - Normal (9000K): x = 0.289 ± 0.003, y = 0.291 ± 0.003 - Cool (12000K): x = 0.272 ± 0.003, y = 0.277 ± 0.003 - Warm (6500K): x = 0.314 ± 0.003, y = 0.319 ± 0.003. These specifications should be used to adjust the Scaler R Gain, Scaler G Gain, and Scaler B Gain values in the factory mode menu.

To troubleshoot issues with the VGA input, ensure that the VGA cable is securely connected to both the device and the TV. Check the VGA input settings on the TV and verify that the correct input source is selected. If the issue persists, inspect the VGA cable for any damage and try using a different cable or port. Additionally, ensure that the external device is functioning correctly and that the TV's firmware is up to date.

The fuses F901 and F902, labeled as 8A 563B, are likely used to protect the circuit from overcurrent conditions. They ensure that the device shuts down safely in case of a short circuit or excessive current draw, preventing potential damage to the components.

The LED indicators (LED1, LED3, LED5, etc.) are connected to various points in the circuit and are likely used to indicate the status of different functions or components. For example, they might show power status, operational modes, or error conditions. The specific functionality of each LED would depend on the circuit design and the device's operational manual.

The IR Board, labeled 715G4169, is a component in the Haier LT19Z6 that likely handles infrared (IR) signal reception and processing. It includes various connections and components such as CN201, VCC, IRRV, R201, and others, which are essential for the IR functionality of the device.