LG M2550D User Manual

Picture OK & No sound

y

Press the

(

,

)

button

(

, 

)

button.

y

Sound muted? Press MUTE button.

y

Try another channel. The problem may be with the broadcast.

y

Are the audio cables installed properly?

No output from one of the speakers

y

Adjust Balance in menu option.

Unusual sound from inside the

product

y

A change in ambient humidity or temperature may result in an unusual
noise when the product is turned on or off and does not indicate a
problem with the product.

No sound when connecting HDMI

or USB

y

Check HDMI cable is High Speed HDMI Cable.

y

Check USB cable over version 2.0.

y

If the sound is abnormal in the HDMI, check the audio format in your
external equipments.

»

Audio Supported format : Dolby Digital, PCM

When the user changes the picture

settings, the

TV

automatically

converts back to the initial settings

after a certain period of time.

y

It means that the TV is currently set to

Store Demo mode. To switch

to Home use mode you should do the followings: From the TV Menu,
choose

OPTION → Choose Mode Setting → Choose Home use.

Now, you have completed switching to the Home use mode.

Power is on, power indictor is blue

but the screen appears extremely

dark.

y

Adjust brightness and contrast again.

Does the ‘Invalid format’

message appear?

y

The signal from the PC (Video card) is out of the vertical or horizontal
frequency range of the product. Adjust the frequency range by
referring to the Specifications in this user’s guide.

Does the ‘Check signal cable’

message appear?

y

The signal cable between PC and product is not connected. Check
the signal cable.

y

Press the ‘INPUT’ button in the remote control to check the input
signal.

No picture when connecting HDMI

y

Check that your HDMI cable is High Speed HDMI Cable.
If the HDMI cables are not High Speed HDMI Cable, flickering or no

screen display can result. Please use the High Speed HDMI Cable.