No picture no sound white arrow flashes 3 times stops then 3 times

D Robbins  try a reset first while holding input and channel down, let us know if that changes anything. After that you will have to remove the back of your TV and checke the boards. Post some good pictures of those with your question so we can see what you see. 在已经存在的问题里加入图片 You need to measure the voltages on the connector from teh power board to the main board. Let us know what voltages you get. There apparently have been issues (bad MOSFET) with the power board for this series.