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Problem: If TV is working, led is normal and there is no picture and backlight on the panel.

Possible causes: 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.

Problem: CI is not working when CI module inserted. 

Possible causes: Supply, supply control pin, detect pins, mechanical positions of pins

CI supply should be 5V when CI module inserted. If it is not 5V please check CI_POWER_CTRL, this pin 
should be low.  

Please 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.

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.