I've owned this q321 for about 5 months and just now it gave out on me. I turned it off and it began to buzz (a screechy kind of buzz. The buzz stopped after about 3 seconds. Ever since this happened there has been no picture and that damn screeching buzz is sure to start every time i turn the damn thing on. My assumption is that maybe dust got into it and a circuit fried or something but i dont know. Is there perhaps anything I can do to fix this in order to avoid dealing with the hassle of the warranty?
It sounds like a problem with flyback transformer ,horizontal output transistor,deflection Yoke shorted ;these things could of caused another problem with power supply transistors/ic's shorting out.
A professional technician is required to diagnose this serious problem.
Technician: Tim Rasch
I have the same TV. The screen went dead. Turned on the tv and waited for a few minuites for the picture to come on, the light went out. the tv is dead. I am dealing with Hyundai to have it repaired. You have to file a claim on the web site. They contacted me and I had to send them a picture of the Tv. I am waiting for there reply. I had the same problem with a TV i bought my mother. It is a Hisense. I am dealing with them, long time getting back to me. Both tv's sound like they have the same problems, power supply.
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I just had this happen to me. Like yours mine just kept buzzing and the on and off switch had no effect. It just kept buzzing.
The way I was able to fix it was to reset the device by holding both the mute button and the call pick up button until the buzzing stopped. It took only 3 seconds to fix and it immediately began to work. When I switched it on the buzzing was gone and it was working again.
I hope this helps anyone as I didn't see and answer to this issue online anywhere and had to figure it out myself. Take care.
You probably had a bad connection now with pop probably separated. You may also have a bad thermal over heat device. one brand is Thermodisk. But you need to know what you are doing. Might be time to replace.
I've never worked on this model so I can't give you a definite part value or location, but you'll probably find a bad filter capacitor (or possibly more than one) in the power supply. The power supply converts the AC power line voltage to the DC (direct current) needed by the electronics. If the filter capcitors don't work, the result isn't smooth and steady, and the result is an annoying hum. You're probably hearing this.
It's possible to replace the bad capacitors, but it's not always easy. The people who make computer speakers don't often design them to be serviced, and sometimes it's a challenge getting into the power supply. But if you or someone you know with some electronic soldering skills is willing to give it a try, you might be able to bring these speakers back to normal. Good luck and thanks for using Fixya!
A buzzing/humm sound could be a earth loop problem. This is caused by connecting amp equipment into different mains power outlets.
Use a power board and connect all your amps and laptop to the one power board.
I purchased a poloroid tv 3732 in may of 2005 from circuit city, after about 14 months the set began making a clacking sound and humming sound that gets so loud it is unbareable. I have to turn the set off. I have found out I am not the only one with this problem that has a poloroid tv. I had a technician at my home that told me there is a service warranty on these sets because the wrong part was used and the part needs to be replaced.