No Back-light Problem
- Problem: If TV is working, led is normal and there is no picture and back-light on the panel.
- Possible causes: Back-light pin, dimming pin, back-light supply, standby on/off pin.
- BACK-LIGHT_ON/OFF pin should be high when the back-light is ON. R185 must be low when the back-light is OFF. If it is a problem, check Q131 and the panel cables.
Standby ON/OFF_NOT should be high for standby condition, check R203.
POWER SOCKET
Module Problem
- Problem: CI is not working when CI module inserted.
- Possible causes: Supply, suply control pin, detects pins, mechanical positions of pins.
- CI supply should be 5V when CI module inserted. If it is not 5V, check CI_PWR_CTRL, this pin should be low.
- Check mechanical position of CI module. Is it inserted properly or not?
- Detect ports should be low. If it is not low please check CI connector pins, CI module pins.
Staying in Stand-by Mode
- Problem: Staying in stand-by mode, 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
- Problem: LED or IR not working
- Check LED card supply on MB70 chassis.
Keypad Touch pad Problems
- Problem: Keypad or Touch pad is not working
- Check keypad supply on MB70
USB Problems
- 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
- Problem: No audio at main TV speaker outputs.
- Check supply voltages of VDD_AUDIO, 8V_VCC and 12V_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.
Standby On/Off Problem
- Problem: Device can not boot, TV hangs in standby mode.
- There may be a problem about power supply. Check main supplies with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW. Additionally it is good to check SW printouts via Teraterm. These printouts may give a clue about the problem. You can use Scart-1 for terraterm connection.
No Signal Problem
- 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.
SOFTWARE UPDATE
In MB70 project you can update the main IC software by using
USB ports. You can find the SW update procedure below.
- Software files should copy directly inside of a flash memory(not in a folder).
- Put flash memory to the tv when tv is powered off.
- Power on the and wait. TV will power-up itself.
- If First Time Installition screen comes, it means software update procedure is successful.
- You can check the SW release name from service menu.
PANEL CONFIGURATION FILE UPGRADE
In MB70 project you can update the panel Configuration file
by using USB ports. You can find the update procedure below.
- Copy panel configuration files to USB root.
- Turn power to OFF by remote controller and plug the USB to TV.
- Turn power to ON by using remote controller.
- TV standby led will blink rapidly during the SW update. Please wait approximately for 1-2 minutes.
- TV will open automatically with the new panel configurations.
STANDBY MICRO-CONTROLLER FILE UPDATE
- Copy Standby micro-controller file to USB root.
- You have to use Service Menufor standby micro-controller files update.
- To access the service menu push “MENU” button and enter the password “4725” while menu icons are on screen.
- Plug the USB to TV.
- Choose “USB Operations” tab to update standby-micro SW file by using remote controller.
- Wait approximately for 30 seconds.
