High pitch crackle buzing sound when set turned on
I have a JVC 32 inch TV model AV-32730 that was given to me, when I turn the set on it has a high pitch crackling buzing sound for about 30 seconds then the sound becomes normal with no noise. This only happens when the tv is turned on after it has been turned off for a while and the set is cooled down. I also noticed the sound seems to go up and down almost fading in and out when watching.
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Take the tv aparts.Take out the tv video board that is connect to the CRT tv tube.Plug the tv back in "High Voltages" be very careful now.Find wire with solid insulaition grounded in a metal frame some where the other end of the wire go toward the "High Voltages" Open CRT tv tube,u will hear a big "POP".Now unplug the tv.Put the tv back together again,nor tv CRT tube should be clean out of bad contamination poison.The tv Focus well be clear up and work as normal tv again.If u scare don't want to mess around with open "High Voltges" pay the tv shop like $50 bucks they can do this job for like 20 mins.
That high pitched sound is likely the Horizontal Output section trying to work. It operates at 15,750 Hz or at the upper end of normal human ears. It will sound like a high pitched whine.
This is a section or your television that you don't want to fool with unless you are quite familiar with servicing your set. There are very high voltages involved and only a qualified technician should tend to this defect. It maybe easy to fix or it may be quite involved. Get an estimate first then decide to go further or not. There is a potential fire hazard here so don't operate your set until this is resolved.
JVC MR140 Miracle Remote
Part Number: MR140 | SKU: 15330258 You can purchase this at partstore.com This will work with any JVC TV, but not with combos or other products. Also I found a user's manual at retrevo.com. I hope this helps you out.
From what you describe, a solder joint has probably cracked loose in a power supply or deflection circuit, which is quite common. Since you do sometimes see a good picture, all of your major components are fine. Repairing cracked solder joints is a very easy procedure and definately worth fixing on a 32 inch TV. The first 2 digits of the model number indicate the size of the TV.
When you say no picture, is there any sound or noise coming from rear of set when you try to turn on. If so then you have no high voltage and maybe a cap in the HV line that is bad. If no sound at all, then maybe a fuse or open resistor in powersupply.
You didn't mention if you saw fine white diagonal lines running through the screen from top to bottom. If so, you likely have a shorted Picture Tube which is not usually fixable. If there are no lines seen running through the screen, then it is possible the High voltage transformer which also has a screen voltage and focus control built in that could be bad. I would expect the cost of that part to be about $100, so the repair cost total could approach that of a new set I would guess.