Haier 48DR3505 Service Manual

To adjust the sound settings, you can modify the values of Sound Mode, Volume Curve, Audio Output, and True Volume for different sources.

The panel settings you can adjust include LVDS Bit Mode, LVDS MAP, LVDS ODD/Even, Backlight, 6MX0 LVDS Map, 6MX0 Channel, 6MX0 Mirror, 6MX0 Demo, and 6MX0 Update. You can also reset the panel setting date.

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 CN2 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 power supply issues, first check if the power has a 5Vstb output. If not, replace the power supply. If it does, check if CN4 Pin3/4 has a 5V input. If not, replace the power board. If it does, check if CN2 Pin1 has a 12V input. If not, replace the power board. If it does, verify if the DC/DC converters have the right output. If not, replace the corresponding DC/DC converter.

First, verify if the same problem exists on other channels. If the issue persists only on that channel, check the picture and sound system of the channel. If the problem is still not resolved, change the channel to the correct sound system (PAL-BG SECAM/L) and refer to the relative instructions in the manual for color adjustment. If the issue continues, update the software and reboot the device, or consider changing the mainboard.

To troubleshoot a black and white display issue, first check if the problem occurs on other channels. If it does not, inspect the picture and sound system of the affected channel. If necessary, switch to the correct sound system (PAL-BG SECAM/L) and follow the color adjustment instructions in the manual. If the problem persists, update the software, reboot the device, or consider replacing the mainboard.

This issue could be due to a problem with the polarizer, specifically a 'bladder' or 'bubble' between the polarizer and the top glass. It might also be caused by a 'tine or rigidity' issue inside the polarizer.

Flashing or flickering on the display could be due to a 'dot defect' in the panel, which might be caused by a chip losing action, an IC short or jointing bad, or a poor connection between the panel and the VSC.

The backlight shutting down after some time could be due to a short between the lamp housing and the wire, which causes excessive power consumption. It could also be due to a bad connection between the wire and the electrode.

The backlight appearing darker than normal could be due to a mechanical noise of the backlight unit or a bad connection between the wire and the electrode. It could also be caused by a short between the mechanism and the panel.