Facing TV Problems? Ask a TV Technician.
Have you tested the voltage outputs from the power supply board?
A faulty power supply board can also cause these error codes to appear, since the other boards are unable to work correctly without the correct input voltage.
You should leave all harnesses attached and connect the negative lead to ground and use the positive to probe the outputs.
Did you change anything in service mode?
Ok, that may have inadvertently caused some other problem.
Let me see if another expert can assist you further with this...