Thursday, February 12, 2015

HITCAHI L19DG07U - L22DG07U SERVICE MODE AND TROUBLESHOOTING

HITCAHI L19DG07U - L22DG07U

LCD TV

SERVICE MODE AND TROUBLESHOOTING 

SERVICE MENU SETTINGS

In order to reach service menu, First Press “MENU” Then press the remote control code two times, which is “4725”.

SOFTWARE UPDATE
In MB60 project there is only one software. From following steps software update procedure can be seen:
1. MB60_en.bin, mboot.bin and usb_auto_update_T4.txt documents should copy directly inside of a flash memory(not in a folder).
2. Put flash memory to the tv when tv is powered off.
3. Power on the and wait when the tv is opened.
4. If First Time Installition screen comes, it means software update procedure is successful.
TROUBLESHOOTING
No Backlight
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.
Possible couses: Backlight pin, dimming pin, backlight supply, stby on/off pin Backlight pin should be high in open position. If it is low, please check Q181 and panel cables.
Dimming pin should be high or square wave in open position. If it is low, please check S16 for Mstar side and panel or power cables, connectors.
Backlight power supply should be in panel specs. Please check CN705 for MB60, related connectors for power supply cards.
STBY_ON/OFF should be low for standby on condition, please check R1677.
CI Module
Problem: CI is not working when CI module inserted.
Possible couses: Supply, suply control pin, detect pins, mechanical positions of pins CI supply shoul be 5V when CI module inserted. If it is not 5V please check CI_POWER_CTRL, this pin should be low.
check mechanical positions of CI module. Detect ports should be low. If it is not low please check CI connector pins, CI module pins
and 3V3_VCC on MB60
Led Blinking
Problem: LED blinking, no other operation
This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal operation. When there is a short circuit protect pin will be logic low. If you detect logic low on protect pin, unplug the TV set and control voltage points with a multimeter to find the shorted voltage to ground.
IR
Problem: LED or IR not working
Check LED card supply on MB60 chasis.
Keypad Touchpad
Problem: Keypad or Touchpad is not working
Check keypad supply and KEYBOARD pin on MB60.
USB
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V. Also USB Enable should be logic high.
No Sound
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC and 3V3_VCC with a voltage-meter. There may be a problem in headphone connector or headphone detect circuit (when headphone is connected, speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3v.
No Sound at Headphone
Problem: No audio at headphone output.
Check HP detect pin, when headphone is. Check 5V_VCC and 3V3_VCC with a voltagemeter.
Standby On/Off
Problem: Device cannot boot, TV hangs in standby mode. 
There may be a problem about power supply. Check 12V_VCC, 5V_VCC and 3V3_VCC with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW. Additionally it is goood to check SW printouts via hyper-terminal (or Teraterm). These printouts may give a clue about the problem.
DVD
Problem: DVD is not working.
Check that DVD source is selected in Service menu. Check supply voltage of DVD namely 12V_VCC.
No Signal
Problem: No signal in TV mode.
Check tuner supply voltage; 5V_TUN. Check tuner options are correctly set in Service menu. Check AGC voltage at RF_AGC pin of tuner.