Tv which hitted by lightning,picture is ok but no sound.so i changed micro processor ic.after that sound is ok in audio video connection but only hssing sound .picture is ok.what should i do now.should change tuner ?
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hi check in the menu make is not been muted, if ok plug some earphones in to the tv, if there's sound, the sound processor is working, if not you may have faulty audio ic or a bad smd capacitor, thanks
If you can see menu on-screen display, just get into it, surf for blue-back option and turn it OFF first, and see whether there is any grains appears on your screen. If there is no grains, and only a plane raster, your TVs video processor Ic has got damaged, and should need replacement. If there is grains, you just retune it in autotuning option, and allow it to store all the transmitting signals at that time. This process may take two or three minutes to complete, and you should wait till then. Never forget to connect antenna socket to the antenna terminal of your tv.
If you are using set top box, and connected it to the TV through audio-video cable, your TV has no fault, but the set top boxs' video processor has got damaged. OK,
There is no sound you means? If so what about the picture? If picture is ok and there is no sound either the speaker of your tv or audio output Ic inside your TVs circuit board is faulty.
To check it, place your ear very close to the speaker side of your tv and turn it on. if a "thumb" sound or a "hum" sound is heard from your TVs speaker, the output Ic is faulty. If there is no sound at all, speaker is faulty. If you have any home theater system; and your TV has audio out RCA sockets at the rear or front side of it, connect it to audio system, and swich on both and find if there is sound output or not. If yes you can assure your TVs sound filtering system is ok, and the fault is somewhere between speaker and audio output Ic. Ok.
If your receiver was connected to any power source and that power source was not a surge protector strip there may be damage to the receiver as lighting travels. Another thing to consider is the fact that many people will put their equipment on surge protectors but the cable is still connected to the TV etc...This is just another avenue for the lightning to get into the home and blow up your system. I always disconnect any cable from my computer and TV. The power source from the wall is also unplugged when there is a storm just to be sure. Surge protectors are limited in their use as well. I don't believe they can take too many lightning hits. It is best to change them out.
It has been my experience with that model mitsubishi that the usual culprit is loss of vertical sweep. If the beams in the picture tubes stops moving up and down this is detected by the micro processor and the video is blanked, but the set is not shut down. The usual cause of loss of vertical sweep is bad solder connections on the deflection yokes or a failed vertical output IC.
no picture & sound ok
as sound is there means your power supply &high voltage section is ok
problem is in video section
1 crt is glowing or not if not check its supply.
2 check crt base or any connector for loose
3 check supply to video & crt base(g2)
4 check for video signal is coming to video sectuon from processor ic.
5 loose print if any.
hope this will help
Your problem is somewhere between the tuner and video detector circuit.
The signal entering your TV carries: video,red color,and blue color as well as sychronizing pulses for color and horizontal and vertical deflection ( actually vertical sync. is derived from horizontal sync.) along with burst pulses to synchronize the color. After all these, the sound is an fm signal entwined with a pilot signal for stereo audio. WHAT a mess!
After the audio passes through all this, it is detected and sent to the audio processor.
If any frequency has drifted away from it's value then you loose the sound.
SO... your problem could be in any of the tuned circuits or in the audio processor IC (chip). Any component changing value could creat this problem. Most likely the audio processor IC. You'd need to have the set checked out by a tech to find your problem.
Your unit has it seems to have developed a video problem. it could be in the video switching IC or the video processor. Its going to need a trained technician, who knows how to use an ocilliscope to find the video problem.. Good Luck