I wish I had a solution--My DVD picture and sound is fine, but it takes about 30-40 minutes to get any kind of picture but it is broken--not clear at all - and the sound is all garbled, totally stops for seconds to minutes a a time. It is only a little over a yr old. I finally isconnectexd today and am going back to my cheap-o but dependable tv.
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Check the solder joints on the vertical IC. If you reflow the joints and the problem persists replace the IC. Buzzing sound may be the flyback or something dealing with high voltage. Take the back of the TV off and see where the sound is coming from and see if you can see anything when you turn the TV on. Stay away from the TV and don't touch anything when turning it on.
Check connections in rear of television if connections are good check condition of RCA jacks and other connectors.Lots of times poor sound and vision quality is due to cheap or damaged connectors and/or wireing.
Your model has all the audio and video circuits that are all within the Control Box unit which has to be replaced as a unit. You can get one at the following link. You would have to leave them a email as they dont list the polaroid Control boxes, But I know they have one for your model. Just click on the " contact Us" link and let them know the model number they respond quickly. http://servicemanuals.vstore.ca/
This is what the control box looks like.
I found this solution on another review, hope it works Model Number:Proscan 26" LCD HDTV w/ Built-in DVD Player26LB30QD "pro: good price, TV picture is clear and DVD player is compatible well. con: sound noise There was hum when I first turned the TV on, then I followed these instructions (found it from other review) to fix the hum issue: 1. Turn tv on 2. Input mode should be tv 3. Turn volume to zero 4. With remote enter 9 8 7 6 5. A menu will appear on left side 6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice, 7. Turn up volume and listen if hum is gone." It works,no hum."
if you have a converter box hooked up to the tv as well turn the volume down on both devices and bring the volume on the tv up to mid range, then increase the volume on the converter.....one is overriding the other