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Whats the model number of your set and I will assist you as the hissing is most likely the flyback or the HV splitter. The model number will help me decide which. also let me know if the hissing is louder at the front of the set or louder at the rear.
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.
Hissing sound caused by input section RCA cables defected grounding maybe loosed or the RCA cables are defected already replaced it with new RCA cables so hissing sound is gone.
Philips TVs have an audio technology called automatic volume leveler (AVL). This was designed to eliminate the volume increase with commercials.
This setting is available in the audio page of the TV settings menu. turning the AVL option on should help with this problem.
If you use a digital cable box, it could be that the volume on that isn't turned up all the way. I didn't even realize the box had volume controls until 2 years after I got it...makes a HUGE difference now
First- Do you have a cable box ( with a volume menu in it)?
If you do make sure the volume on the box is at least 3/4 full, no lower. Then re adjust the volume on the tv to a normal level and let me know
The sound that you hear is coming from the sound detector not working or not receiving any audio. If the set is set to a second audio (SAP) program this could be you trouble. Some programs are broadcast this way. (such as Spanish for Spanish speaking people. Check you audio program settings.
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