Hitachi L32A404 TFT LCD TV - how to enter service mode, firmware update, troubleshooting, power board schematic

Hitachi LCD TV SMPS 715G3261P02000003S circuit diagram, service mode, software update, troubleshooting

 Enhanced definition LCD display panel

This specification applies to the 31.5 inch Color TFT-LCD Module T315XW04 V1. This LCD module has a TFT active matrix type liquid crystal panel 1,366 x 768 pixels, and diagonal size of 31.5 inch. This module supports 1,366 x 768 mode. Each pixel is divided into Red, Green and Blue sub-pixels or dots which are arranged in vertical stripes.  Gray scale or the brightness of the sub-pixel color is determined with a 8-bit gray scale signal for each dot. The T315XW04 V1 has been designed to apply the 8-bit 1 channel LVDS interface method. It is intended to support displays where high brightness, wide viewing angle, high color saturation, and high color depth are very important.

1.Replacement work should be started after the Panel Module and the AC/DC Power supply have become sufficiently cool.
2. Special care should be taken when working near the display area in order not to damage its surface.
3. The Panel Module should not be touched with bare hands in order to protect its surface from blemishes and damage.
4. It is recommended that you use clean soft gloves during the replacement work in order to protect not only the display area of the Panel Module but also yourself.

Firmware Upgrade:  Equipments and materials
1. TV remote control
2. AC power 110V/ 60Hz
3. Flash storage.

Use PC to write software to a flash storage, press “on” button to start the TV. (Take L46S603 for example)
1. Insert the flash storage into the USB port, and you will see a picture in which you can choose “YES” or “NO”.   You choose “YES”, and then the software will update automatically.
2. After software update is finished, you put out the flash storage and restart the TV.
3. Press “menu+1999+select”, check whether software version is OK.

No Picture, No Sound
First, confirm the status of Stand-by / On lamp (LED), then:

Status of Stand-by / On lamp (LED) & probable cause

Not lighting:  Confirm the connection of AC cord is complete, and AC switch is turned on, then forward.

Lighting in red:  Power save mode of Video or PC input. It is not defect.

Lighting in red:  Turn power on by remote controller.  If it does not turn power on.

General troubleshooting (Click on the pictures to zoom in)

SMPS 715G3261P02000003S and sub power control schematics

Main and Power PWBs

Audio amplifier section schematic

Adjustment
In the TV mode adjust volume to zero, press menu key and then press number key 1 > 9 > 9 > 9. to achieve the factory mode. Select the item of White Balance and press right key to enter it.

Change TV, press the item “Current Source” to Component mode and change signal to 720p mode, press the item “Auto Color”; 

Change TV, press the item “Current Source” to PC mode and change signal to PC TIMING 137(1024X768) Pattern 147 (16 Grays), press the item “Auto Color”.

[Activating Reset to Default Settings (Reset to Def) will zero both hour counters, the one for back light time and the one for total time.  You may want to add a condition or event in which this would be recommended.]