Replaced main board and main power supply board and same problem on picture or sound and when power off the red power lite blinks 5 times
SOURCE: first lost pic now no sound replaced main
YOUR OTHER POWER SUPPLY IS GOOD, YOU NEED TO REPLACE THE Y-BUFFER AND Y-MAIN BOARDS
SOURCE: After plugging unit into a known work wall outlet
Is it Samsung HC-R4755W rear projection tv or nay other model?
Is it power indicator red light that blinks 6 times on tv front?
Let me know to diagnose possible cause of problem.
Thanks.
SOURCE: power light comes on and clicking is heard but no
your problem is more a defective y board with y buffer boards one of them is short
SOURCE: Why won't my Samsung UN40D5005BF come on?
Lightning damage can do a # on LCD TV's. I've seen cases where it took out power supplies and main boards at the same time. I'm not one who likes to use the "shot gun" approach. You would need to get the set professionally diagnosed in my opinion. Where did you get the main board from?? Are you sure it is a working board?
since you have replaced the main parts in the tv already it is safe to say you have bad led strip these can be tested with a 12v dc power supply
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