You say that they replaced the Mainboard 2 times on this model? I had the same exact model and they came out and replaced the Mainboard and 2 other parts 4 times. Under the lemon policy warrantee at Bestbuy, I am now (finally) able to replace the TV with a Mitsubishi WD-65733. This TV is a "LEMON" if you can, "GET RID OF IT!" It's a piece of "JUNK!"
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If the set went dead during a storm and will not power up at all, first try unplugging the set and waiting an hour or so, and then plug it back in to a working outlet and try turning it on. If the set still will not respond, your power supply has stopped working and should be serviced by a qualified tech familiar with Samsung projection sets.
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Check the circuit breaker first for power to the outlet it is plugged into. If it is in a power strip then make sure that the reset is hit on that. I sounds like you had a line surge for some reason. If all else fails there is a fuse on the power board in the TV. Check to see if that is blown. If not check for black burn marks on the power supply board. Could have blown that altogether.
Now tv turn on.Hear alots of clicking or squiling,loud motor noises turn on?Alot of clicking,the Ballast board it dead,this board help ignite the projection lamp.Tv also have a colors wheels.The colors wheel is dead,if hear squiling noises,loud motor noises.
If your TV was plugged into a power strip with a surge arrestor, the power strip may need a reset (if there is a reset button) or replacement (those surge arrestors are only good for so many "hits". Try plugging the TV in elsewhere.
If it was not plugged into a surge suppressor, it is time to call a repairman.
The STANDBY light will flash if the television detects an issue within the
television. Some of these issues can be resolved simply by following the steps
below to reset the television.
If the issue is still unresolved after following all of
the troubleshooting steps, service may be required . Please note the number of times the
STANDBY light flashes and relay that information to the service center.
Turn off the television.
Unplug the television power cord from the electrical outlet.
Let the television remain without power for 60 seconds.
Plug the power cord back into the electrical outlet.
NOTE: If the television is
plugged into a power strip or surge protector, remove it from the power strip or
surge protector and plug it directly into the wall outlet. If the issue is
resolved, the problem is with the power strip or surge protector and not the
I just had this problem fixed. In my case, it was because the insulation on the CRTs was cracked, and when it would warm up, the shielding would separate and would let 5000 volts arc across the main board. This, obviously, damaged the board. The tech didn't catch the arcing right away, so they replaced the main board twice before they used a high-temp RTV to patch the insulation.
The power-cycling was a result of the damaged board.
The point of this story is that the broken part may be a symptom of the real problem.