INSIGNIA NS-LCD37HD-09 _ XOCECO - LC37HV41 – TROUBLESHOOTING CHART - Main Power Supply [SMPS] Schematic (Circuit Diagram)
Before servicing, check to find the possible cause of the fault according to the table below.
Picture is out of focus or jumping
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* Bad status in signal receiving
* Poor signal
* Check if there
are failures with the electrical connector or the antenna.
* Check if the
antenna is properly connected.
|
Fringe in picture
|
* Check if the antenna is correctly oriented.
* Maybe there is
electric wave reflected from hilltop or building.
|
Picture is interfered by stripe shaped bright spots
|
* Possibly due to interference from auto-mobile, train,
high voltage transmission line, neon lamp etc.
* Maybe there is
interference between antenna and power supply line. Please try to separate
them in a longer distance.
* Maybe the
shielded-layer of signal wire is not connected properly to the connector.
|
There appear streaks or light colour on the screen
|
Check if interfered by other equipment and if interfered
possibly by the equipment like transmitting antenna, non-professional radio
station and cellular phone.
|
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 colour phase or colour tone
|
Check if all the picture set-ups 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 colour changed or colourless
|
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 ofDVD player (broadcaster) is set too high.
|
No picture or signal produced from the display 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.
|
No picture and sound, but only hash.
|
Check if the antenna cable is correctly connected, or if
it has received the video signal correctly.
|
Blur picture
|
* Check if the antenna cable is correctly connected.
* Of if it has received the right video signal.
|
No sound
|
* Check if the “mute” audio frequency setting is selected.
* Check if the
sound volume is set to minimum.
* Make sure the
earphone is not connected.
* Check if the
cable connection is loose.
|
When playing VHS picture search tape, there are lines at
the top or bottom of the picture.
|
When being played or in pause VHS picture search tape
sometimes can’t provide stable picture, which may lead to incorrect display
of the liquid crystal TV, In this case press “auto” key on the remote control
so as to enable the
liquid crystal TV set to recheck the signal and then to
display correct picture signal
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