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Your unit has some sort
of PSU fault, or a problem that is shutting down the Power Supply
Unit, PSU. This happens so that no further damage, and possible fire will
occur. The sound is it starting up, shutting down, over and over. You need to take the unit to a reputable service
centre/man and ask for a firm "Quote" for the work to be done.
Sounds like a Arcing CRT tube(s)!, You may have a bad color tube!, Set has one red,blue & green tube. If ones at fault, And you heard a POP - more then likely a BAD CRT, The Set is Turning Itself OFF to prevent any more Damage!.... onegeo
a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.
The 46H84 has 3 CRTs instead of a lamp. Red, Green and Blue. Your red CRT is shorting out shutting down the set.Here is how you test that theory. Remove the speaker grille, there will be an access panel behind the grille remove that and you will see the CRTs red is usually on the left. hit the power momentarally to locate which tube is red. then power down and unplug the power cord. Carefully remove the tubes Circuit board. ( you may have to carefully slice the glob of silicone applied at the factory to get the circuit board off) Once you have the circuit board off the Red CRT make sure it isnt touching anything and try powering up the set. If the set stays on and the other 2 CRTs light up. That tells you the RED crt is shorted and thats whats shutting your set down. Let me know if I can assist you further.