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Re: Emerson EWF2702 TV Problem
This is a vertical deflection problem, These are the possible causes:
1) bad vertical coupling capacitor 2) bad vertical output IC 3) bad vertical driver IC 4) bad CRT deflection yoke
Troubleshooting needed: 1) using the TVs schematic locate the driver IC the output IC and the CRT yoke transformer. 2) using an oscilloscope look at the vertical driver signal it should be a sawtooth signal from the driver to the yoke (increasing in amplitude for each section, i. e. driver and output). 3) if no sawtooth patter is seen that is your problem, look for the component in the section where signal is entering but nothing is coming out. 4) replace the components
Now let me tell you something, don't continue to play the TV with the line present with brightness applied, this will burn the image of the line into the phosphorous coating of the CRT.
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Check the infrared emission from the remote control. If it is OK, the infrared sensor inside the TV is faulty. To get more details about how to check a remote control, visit the site named 'Electro-help'. You can search for it either by Google or yahoo.
Your Emerson TVs LOT [Line Output Transformer] has damaged. It should be replaced with same type and number. Before replacing it, first repace the horizontal output tansistor. This transistor can be located very near to the LOT, screwed onto a metal heatsink, and a black three terminal component. Replace it first, and switch on your TV for a short time, say 3 to 5 seconds, switch it OFF, unplug it from the mains sullpy wall plug, and check the heat of the transistor, by touching it by bare fingers. It may be slight warm but not too hot. If it overheats, make sure that the LOT has damaged. OK.
most picture tube tv have a deflection circuit, usually located in the main board. ausuall suspects are the horizontal out transistor, the horizontal output transformer, and the voltage regulator(usually found in the power supply circuit). If you are familiar with the use of a multimeter and short testing for transistors, you might be able to repair any of these mentioned components, but if you have no experience around these components. best to leave it to an experienced tech to give you an estimation on repair costs. don't forget to unplug all electrical connections brfore working on any electrical circuitry before removing the back cover.
A line on an LCD, either horizontal or vertical usually means the video driver board is defective or the screen is defective, does it show up as black even on a dark screen? That means a line of LCD "shutter"s is not working and there is a problem that cant be fixed by a reboot or channel change. Bummer.
MOST BE A VERTICAL PROBLEM if the line cross the screen from left to rigth,,, and if the line cross the screen from top to buttom then is an horizontal circuit problem any way you need a tech how ever if you know about tv repair and have somes skill in the campus try resoldering the vertical output IC....good luck and rate me