My first gut tells me that this is a power supply problem. The power supply runs out of capacity due to the increased load of the audio amp.
Possible problems might be power supply capacitors have changed their value (lowered), if it has a linear power supply, the full wave bridge (that converts AC to DC)might have a bad diode, if it is a switching power supply one or more of the output capacitors may actually be open.
Another possible problem is a cold solder joint. Does the picture breakup occur when the case is slapped? This could indicate a mechanical failure (like a solder joint).
Is this the only symptom that this set has?
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The TV could be wired to same breaker on the furnace. Or the cable line maybe cut or rubbing on electric line for furnace which can cause interference. Check each wire make sure there isn't any bare wire showing. good luck
check that the coax cable is complete and has no internal breaks. get a new piece and even paring both ends to wire you should get pic and sound even if its not clear. then attach new plugs and connect. Also check that the outside cable is still connected. If iit goes up into the roof check mice or rats have not chewed the cable. Even a rabbits ears antenna should be able to oick up some signal even in a poor reception area.
Sometimes if it snot an antenna problem select rescan on the remote to check for signals
I wonder if your problem with loud volume occurs primarily on commercial breaks, when you turn down the sound and then, since the sound, for the program itself, is so low in volume, you have to turn it way up again to enjoy the program?
If this is the case, and there are no other problems with the set, this may not be the set's problem, but the fact that commercial material is broadcast at a higher volume than program material by some outlets, so that while you are in the kitchen, during commercials, the sound of the commercial can still be heard.
I have one of these in my shop with same problem. Unit has sound but no backlights due to the powersupply/inverter board ( top board in metal box. The lights come on for a second and go out. Problem was originally intermittent. You can order this board from Fox Intl Part but will take a minimum of 12 weeks. Look at the lower right corner of this board and locate the dip switch of 4 positions. the bottom one is labeled " normal & burn " Try moving it to "burn" My set is in the burn position and has been running for 2 days now OK
if your handy and know your way around , open the TV to get inside and do a visual check for any DRY SOLDER on the PC board .specially around the POWER SUPPLY AREA and the
horizontal output area , those area gets a little heat on the board . do some REsoldering. if you can take out the PC Board
and do the inspection , will be much better . hope this been helpful. good luck
I believe you have a regulation problem ,when you increase the volume the audio output IC draws more current therefore the power supply has to keep up with the increase in current,the symptom might happen if you increase the brighness to the max as well,the voltage changes need to be monitored closely to diagnose what component is not doing the work.If you are familiar with tv service this is a problem that will give you a challenge but if you are not too familiar be safe and let someone else get the headache.Let us know how it goes or if you need more information.
You already hit the nail in the head,the problem might be the actual conector loose inside the set or the tuner has loose conections to the main board,the shell of the tuner is the ground make sure the conections are solid,if you are familiar with tv service this will help but if you are not too familiar be safe and call for help,right now it should not be expensive.