Poor sound on JVC LT55N935

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/

In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

Use it connected to an external amplifier & speaker system.

five litres , -- pour 4 litres of oil, let them go till sump, then take the oil dip stick after 5 minutes to check the level then pour the remaining oil. the oil dipstick contains two level indicator, low level and maximum level - low level contains minimum 3 litres but between the low level and the maximum level it is only 3 litres maximum. Hope this may be enough suggestion - Raj / India / [email protected]

Have you tried using a standard headphone, maybe your speaker has the problem.

try to see if the wave volume is on and maximum on the volume panel ( double click on vol icon on tray system (right low) ) ...also see if your speakers are plugged into the proper place ...and are not in the auxiliary out or something like this ...they should be plugged into the green middle out ...if they are simple stereo 3,2 jack ...so ..if the problem its still on ..its probably the sound card...(actually the pre-amplifier on it ..)

your phone ringer were not work properly, so plz check it & change it.

I was playing around with my Sherwood RD 6513 and adjust the the output level to its maximum, amongst other settings. This limited my output on the amp to a maximum volume of 65 not 90+.. Anyway i pluged in the microphone and done another 'auto setup' of the volume levels and distances, and this allowed the volume to exceed 65 again!

Also if you have an external source such as a DVD player - i would assume you have already checked its output volume setting?

low voluume even when setting is at maximum

Try plugging back the headphones and unplug them agai, but

pull them slowly.

> Open Control Panel
> Sound Properties
> Speaker Properties
> Enhancements
>

Loudness Equalization : on

Equalizer: Choose one (Jazz seems to be loudest setting but sounds of hallway effect so I use powerful for clarity.)

This has more than doubled the level of volume on my acer 5570.

- verc