XOCECO LC15H3S, Service Manual

Page: 9 / 31

8
2.TV set:
No picture and sound, but only
hash.
Check if the antenna cable is correctly connected, or if it has
received the video signal correctly.
Symptoms Possible cause
Unable to switch the power on Check to see if the power plug has been inserted properly into
the socket.
No picture and sound Check to see if the power supply of liquid crystal TV has been
switched on. (as can be indicated by the red LED at the front
of the TV set)
See if it’s receiving the signal that is transmitted from other
source than the station
Check if it’s connected to the wrong terminal or if the input
mode is correct.
Check if the signal cable connection between video frequency
source and the liquid crystal TV set is correct.
Deterioration of color phase or color
tone
Check if all the picture setups have been corrected.
Screen position or size is not proper Check is the screen position and size is correctly set up.
Picture is twisted and deformed Check to see if the picture-frame ratio is properly set up.
Picture color changed or colorless Check the “Component” or”RGB”settings of the liquid crystal
TV set and make proper adjustment according to the signal
types.
Picture too bright and there is
distortion in the brightest area
Check if the contrast setting is too high.
Possibly the output quality of DVD broadcaster is set too high.
It maybe also due to improper terminal connection of the video
frequency signal in a certain position of the system.
Picture is whitish or too bright in the
darkest area of the picture
Check if the setting for the brightness is too high
Possibly the brightness grade of DVD player(broadcaster)is
set too high.
No picture or signal produced from
the displayer if “XXX in
search”appears.
Check if the cable is disconnected.
Check if it’s connected to the proper terminal or if the input
mode is correct.
There appears an indication -
“outside the receivable scope)
Check if the TV set can receive input signal. The signal is not
correctly identified and VGA format is beyond the specified
scope.
Remote control cannot work
properly
Check if the batteries are installed in the reverse order.
Check if the battery is effective.
Check the distance or angle from the monitor.
Check if there is any obstruct between the remote control and
the TV set.
Check if the remote control signal- receiving window is
exposed to strong fluorescence.