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Re: Pop and hiss
Sound not so good. You probably have a bad flyback transistor and now the power supply is fried also.If your lucky all youll have to do if your a tech and only if your a tech is to replace the Hi voltage transformer and the horizontal output transistor. Now these sets have high voltage still around there componets even when the sets unplugged, so please if you wanna invest in the set take it to a pro to assist you in this repair. Good Luck
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Some thing wrong with it. It might be either to its main power supply regulator circuit, or its horizontal output circuit. A through check up should be done. Contact any experienced service technician. Never switch it On, till the fault have been rectified.
Check the main power supply regulator section for faulty component/s. The sound you heard might be of a bursted electrolytic capacitor at the power regulation stage circuit, due to some spikes in the input AC voltage. Open the TV and check this section. Be sure to unplug the TV from AC mains wall socket, before open it.
If you disconnect or power off the converter box does the hiss go away?
If you connect a VCR or DVD player does it still have the hiss? We
need to isolate what source is causing the hiss if it is from the set or
if it is from the converter box.
When you turn the volume control down on the set, does the hiss
reduce in level? If mute stops it, it should reduce in level as you
turn the volume down. Then turn up the sound level control on
the converter box whether its a manual control or by remote. If you
can get a combination that minimizes the hiss and gets higher sound
level from the programming that may cure it.
I am not familiar with the converter box you are using. Are you using
Audio/Video cables from it to the set or is it coming out with coaxial cable
and used on a channel? If you are using a very old set with a tuner input
perhaps the fine tuning is out of adjustment.
Sounds like a power surge likely followed the outage- or maybe you were actually hit by lightning- and since this set did not have a built-in kill-switch (circuit breaker) it could have very well caused some significant damage. Check the internal fuses, if they are blown, chances are, so is the rest of the set. For the cost of repairing something as over-reaching as this, I'd be looking for something new (And be sure to buy a quality surge protector, so this does not occur again!)
A hissing sound that comes from the back of the set (not from the speaker) usually indicates a high voltage leak, most likely around the "suction cup" at the top of the picture tube or around the flyback transformer. Remove the back of the set and turn it on, and when you hear the hissing sound, shut off all the lights in the room and you should be able to see a purple-ish or white-ish glow from the spot that is hissing. Shut the set off, discharge the high voltage and clean and seal the problem area. Of course this should be done by someone experienced with stopping high voltage leaks.