XOCECO LC-26HU36S, Service Manual

14 

Trouble shooting 

1. Fault clearance 

Before servicing please check to find the possible causes of the troubles according to the table 

below.  

1.1 Antenna (signal): 

Picture is out of focus or jumping 

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 automobile, 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 color 
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.     

 
1.2 TV set: 

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