Haier 40D3505T Service Manual

If your Haier 40D3505T TV does not turn on, first check if the AC input is properly connected and if the power is turned on. If the power is on, check the power board to see if it is outputting 5.2V. If not, you may need to replace the power board. If the power board is functioning correctly, check the IR board and LED. If the issue persists, you may need to replace the main board.

If the LED on your Haier 40D3505T TV is off, it indicates that there is no power. First, ensure that the AC input is connected properly and that the power is turned on. If the power is on, check the power board to see if it is outputting 5.2V. If not, you may need to replace the power board. If the power board is functioning correctly, check the IR board and LED. If the issue persists, you may need to replace the main board.

If the display is abnormal, first check the source. If the issue persists, reset the source. If the problem still isn't resolved, enter factory mode to perform 'EEPROM initial' and 'Reset'. If the display is still abnormal, check the main board and consider replacing it if necessary. Additionally, check the LVDS cable and replace it if needed. If the issue continues, check the panel and replace it if required.

First, check the audio source connection and ensure the TV system is set correctly. If the issue persists, try reinserting the audio cable or changing the TV system. If the TV is muted, adjust the volume or enter the menu to reset. If none of these steps work, enter factory mode to do a 'Reset'. If the problem still isn't resolved, check the cable between the speakers and the main board. If the cable is faulty, replace it. If the cable is fine, check the speaker resistance value to see if it is within the specified range. If the speaker resistance value is not in spec, replace the speaker. If all else fails, you may need to replace the main board.

If the audio cable and TV system are correctly set up, check if the TV is muted and adjust the volume or enter the menu to reset. If the issue persists, enter factory mode to do a 'Reset'. If the problem still isn't resolved, check the cable between the speakers and the main board. If the cable is faulty, replace it. If the cable is fine, check the speaker resistance value to see if it is within the specified range. If the speaker resistance value is not in spec, replace the speaker. If all else fails, you may need to replace the main board.

First, check if the keyboard is connected properly. If not, reconnect it. If the keyboard is connected properly, check if the buttons are functioning correctly. If the buttons are not working, replace the button function. If the keyboard is not working, enter the factory mode to do a 'Reset'. If the issue persists, you may need to replace the main board or the keyboard.

To prepare a USB drive for firmware upgrade, ensure the file system of the USB drive is FAT16 or FAT32. Copy the software from your computer to the root folder of the USB drive and then unplug it from the computer.

To upgrade the firmware, first turn on the TV using the power key on the remote controller or the right side of the TV. Then, plug the prepared USB drive into the USB port of the TV. When the TV detects the USB drive and displays the upgrade information, select the 'Yes' option to proceed with the firmware upgrade.

To prepare a USB drive for a firmware upgrade, ensure the file system of the USB drive is either FAT16 or FAT32. Copy the software from your computer to the root folder of the USB drive, then unplug it from the computer.

The 'HeadPhone / Audio Output (Side)' connector is used for connecting headphones or external audio devices to the Haier 40D3505T. It is labeled as CN602 and is associated with components like R621, R628, C620, HPOUT_L, R627, HPOUT_R, R629, and C621.