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Take pictures of the back start removing screws, look at labels, write down model number, download pdf manual, and customer service number, part list, if your unit has a small rubber oval belt that can be replace, if a gear is shot, you would have to replace a section p/n it may take some research.
The model number indicates a Hitachi Plasma (correct?)
If buzz etc one channel is having a problem (not likely the speaker as you have discovered)
RCA HAS A OLDER SET WITH SAME MODEL NUMBER.
Means the left channel in the audio output is defective--If you Google the model number with "service manual" you should be able to find a schematic which will tell you if a single chip is used for both channels for output (this is usual case).
With that information either the chip or the board it is located on should be able to be repaired or replaced outright.
PTS ELECTRONICS DOES REPAIR BOARDS WITH ISSUES LIKE THIS (national company) in case you cannot locate either the part or the complete board.
Hitachi customer service may also be of help if you contact them--one channel low, buzz etc almost always is in output circuit of the audio.
It's my understanding that you can order the parts from Hasbro through
their Customer Service/Replacements Parts section but I didn't find it
there and they have not responded to my email of last week :(
You don't connect speakers to the monitor, you connect it to the tower of the computer. If I'm not understanding your question right then please be more specific. If your monitor has speakers, you connect the audio cord to the tower then to the monitor or vise versa.