Hello
There is some shorted components on the main board to your tV. Just check its horizontal output transistor for collector to emitter leak. Just desolder this transistor out from the baord, and switch ON the TV. If the power supply indicator light lights up steadly, make sure that this transistor is shorted. Before replacing this transistor, LOT must be suspected. if LOT has internal winding short, this faull will happen again.
SOURCE: TV TURNS ON BY IT SELF AND CHANGES CHANNELS AND FPA LOCK IS ON
the problem is there is engaged button there..only technician can do the job by replacing the button that is always engage.
SOURCE: My RCA TruFlat 27F520T 27" TV started acting up.
The buttons on the tv are the problem. I clipped the prongs on one of mine and fixed it .Just use the remote now
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