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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. 

Problem: LED or IR not working
Check LED card supply on MB61 chasis.

Problem: Keypad or Touchpad is not working

Check keypad supply and KEYBOARD pin on MB61.

Problem: USB is not working or no USB Detection.

Check USB Supply, It should be nearly 5V. Also USB Enable should be logic high.